diff mbox series

[RFC,v3,3/4] spmi: pmic-arb: Make core resources acquiring a version operation

Message ID 20240214-spmi-multi-master-support-v3-3-0bae0ef04faf@linaro.org
State New
Headers
Series spmi: pmic-arb: Add support for multiple buses |

Commit Message

Abel Vesa Feb. 14, 2024, 9:13 p.m. UTC 
  Rather than setting up the core, obsrv and chnls in probe by using
version specific conditionals, add a dedicated "get_core_resources"
version specific op and move the acquiring in there.

Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
---
 drivers/spmi/spmi-pmic-arb.c | 111 ++++++++++++++++++++++++++++++-------------
 1 file changed, 78 insertions(+), 33 deletions(-)

Comments

Konrad Dybcio Feb. 14, 2024, 9:18 p.m. UTC | #1 
On 14.02.2024 22:13, Abel Vesa wrote:
> Rather than setting up the core, obsrv and chnls in probe by using
> version specific conditionals, add a dedicated "get_core_resources"
> version specific op and move the acquiring in there.
> 
> Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> ---
>  drivers/spmi/spmi-pmic-arb.c | 111 ++++++++++++++++++++++++++++++-------------
>  1 file changed, 78 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
> index 23939c0d225f..489556467a4c 100644
> --- a/drivers/spmi/spmi-pmic-arb.c
> +++ b/drivers/spmi/spmi-pmic-arb.c
> @@ -203,6 +203,7 @@ struct spmi_pmic_arb {
>   */
>  struct pmic_arb_ver_ops {
>  	const char *ver_str;
> +	int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
>  	int (*init_apid)(struct spmi_pmic_arb *pmic_arb, int index);
>  	int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
>  	/* spmi commands (read_cmd, write_cmd, cmd) functionality */
> @@ -956,6 +957,19 @@ static int pmic_arb_init_apid_min_max(struct spmi_pmic_arb *pmic_arb)
>  	return 0;
>  }
>  
> +static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
> +					  void __iomem *core)
> +{
> +	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> +
> +	pmic_arb->wr_base = core;
> +	pmic_arb->rd_base = core;
> +
> +	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
> +
> +	return 0;
> +}
> +
>  static int pmic_arb_init_apid_v1(struct spmi_pmic_arb *pmic_arb, int index)
>  {
>  	u32 *mapping_table;
> @@ -1063,6 +1077,41 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
>  	return apid;
>  }
>  
> +static int pmic_arb_get_obsrvr_chnls_v2(struct platform_device *pdev)
> +{
> +	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,

It's no longer indented to deep, no need to keep such aggressive wrapping

> +					   "obsrvr");
> +	pmic_arb->rd_base = devm_ioremap(dev, res->start,
> +					 resource_size(res));
> +	if (IS_ERR(pmic_arb->rd_base))
> +		return PTR_ERR(pmic_arb->rd_base);
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> +					   "chnls");
> +	pmic_arb->wr_base = devm_ioremap(dev, res->start,
> +					 resource_size(res));
> +	if (IS_ERR(pmic_arb->wr_base))
> +		return PTR_ERR(pmic_arb->wr_base);

Could probably make it "devm_platform_get_and_ioremap_resource "

Konrad
Konrad Dybcio Feb. 14, 2024, 9:44 p.m. UTC | #2 
On 14.02.2024 22:36, Abel Vesa wrote:
> On 24-02-14 22:18:33, Konrad Dybcio wrote:
>> On 14.02.2024 22:13, Abel Vesa wrote:
>>> Rather than setting up the core, obsrv and chnls in probe by using
>>> version specific conditionals, add a dedicated "get_core_resources"
>>> version specific op and move the acquiring in there.
>>>
>>> Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
>>> ---
>>>  drivers/spmi/spmi-pmic-arb.c | 111 ++++++++++++++++++++++++++++++-------------
>>>  1 file changed, 78 insertions(+), 33 deletions(-)
>>>
>>> diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
>>> index 23939c0d225f..489556467a4c 100644
>>> --- a/drivers/spmi/spmi-pmic-arb.c
>>> +++ b/drivers/spmi/spmi-pmic-arb.c
>>> @@ -203,6 +203,7 @@ struct spmi_pmic_arb {
>>>   */
>>>  struct pmic_arb_ver_ops {
>>>  	const char *ver_str;
>>> +	int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
>>>  	int (*init_apid)(struct spmi_pmic_arb *pmic_arb, int index);
>>>  	int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
>>>  	/* spmi commands (read_cmd, write_cmd, cmd) functionality */
>>> @@ -956,6 +957,19 @@ static int pmic_arb_init_apid_min_max(struct spmi_pmic_arb *pmic_arb)
>>>  	return 0;
>>>  }
>>>  
>>> +static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
>>> +					  void __iomem *core)
>>> +{
>>> +	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
>>> +
>>> +	pmic_arb->wr_base = core;
>>> +	pmic_arb->rd_base = core;
>>> +
>>> +	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>>  static int pmic_arb_init_apid_v1(struct spmi_pmic_arb *pmic_arb, int index)
>>>  {
>>>  	u32 *mapping_table;
>>> @@ -1063,6 +1077,41 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
>>>  	return apid;
>>>  }
>>>  
>>> +static int pmic_arb_get_obsrvr_chnls_v2(struct platform_device *pdev)
>>> +{
>>> +	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
>>> +	struct device *dev = &pdev->dev;
>>> +	struct resource *res;
>>> +
>>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>>
>> It's no longer indented to deep, no need to keep such aggressive wrapping
>>
> 
> The pmic_arb_get_obsrvr_chnls_v2 is used by both:
> pmic_arb_get_core_resources_v2
> pmic_arb_get_core_resources_v7

I meant line wrapping

> 
>>> +					   "obsrvr");
>>> +	pmic_arb->rd_base = devm_ioremap(dev, res->start,
>>> +					 resource_size(res));
>>> +	if (IS_ERR(pmic_arb->rd_base))
>>> +		return PTR_ERR(pmic_arb->rd_base);
>>> +
>>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>>> +					   "chnls");
>>> +	pmic_arb->wr_base = devm_ioremap(dev, res->start,
>>> +					 resource_size(res));
>>> +	if (IS_ERR(pmic_arb->wr_base))
>>> +		return PTR_ERR(pmic_arb->wr_base);
>>
>> Could probably make it "devm_platform_get_and_ioremap_resource "
> 
> The reason this needs to stay as is is because of reason explained by
> the following comment found in probe:
> 
> /*                                                                           
>  * Please don't replace this with devm_platform_ioremap_resource() or        
>  * devm_ioremap_resource().  These both result in a call to                  
>  * devm_request_mem_region() which prevents multiple mappings of this        
>  * register address range.  SoCs with PMIC arbiter v7 may define two         
>  * arbiter devices, for the two physical SPMI interfaces, which  share       
>  * some register address ranges (i.e. "core", "obsrvr", and "chnls").        
>  * Ensure that both devices probe successfully by calling devm_ioremap()     
>  * which does not result in a devm_request_mem_region() call.                
>  */                                                                          
> 
> Even though, AFAICT, there is no platform that adds a second node for
> the second bus, currently, in mainline, we should probably allow the
> "legacy" approach to still work.

OK right, let's keep it.

Konrad
Abel Vesa Feb. 15, 2024, 9:26 a.m. UTC | #3 
On 24-02-14 22:44:55, Konrad Dybcio wrote:
> On 14.02.2024 22:36, Abel Vesa wrote:
> > On 24-02-14 22:18:33, Konrad Dybcio wrote:
> >> On 14.02.2024 22:13, Abel Vesa wrote:
> >>> Rather than setting up the core, obsrv and chnls in probe by using
> >>> version specific conditionals, add a dedicated "get_core_resources"
> >>> version specific op and move the acquiring in there.
> >>>
> >>> Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> >>> ---
> >>>  drivers/spmi/spmi-pmic-arb.c | 111 ++++++++++++++++++++++++++++++-------------
> >>>  1 file changed, 78 insertions(+), 33 deletions(-)
> >>>
> >>> diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
> >>> index 23939c0d225f..489556467a4c 100644
> >>> --- a/drivers/spmi/spmi-pmic-arb.c
> >>> +++ b/drivers/spmi/spmi-pmic-arb.c
> >>> @@ -203,6 +203,7 @@ struct spmi_pmic_arb {
> >>>   */
> >>>  struct pmic_arb_ver_ops {
> >>>  	const char *ver_str;
> >>> +	int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
> >>>  	int (*init_apid)(struct spmi_pmic_arb *pmic_arb, int index);
> >>>  	int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
> >>>  	/* spmi commands (read_cmd, write_cmd, cmd) functionality */
> >>> @@ -956,6 +957,19 @@ static int pmic_arb_init_apid_min_max(struct spmi_pmic_arb *pmic_arb)
> >>>  	return 0;
> >>>  }
> >>>  
> >>> +static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
> >>> +					  void __iomem *core)
> >>> +{
> >>> +	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> >>> +
> >>> +	pmic_arb->wr_base = core;
> >>> +	pmic_arb->rd_base = core;
> >>> +
> >>> +	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
> >>> +
> >>> +	return 0;
> >>> +}
> >>> +
> >>>  static int pmic_arb_init_apid_v1(struct spmi_pmic_arb *pmic_arb, int index)
> >>>  {
> >>>  	u32 *mapping_table;
> >>> @@ -1063,6 +1077,41 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
> >>>  	return apid;
> >>>  }
> >>>  
> >>> +static int pmic_arb_get_obsrvr_chnls_v2(struct platform_device *pdev)
> >>> +{
> >>> +	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> >>> +	struct device *dev = &pdev->dev;
> >>> +	struct resource *res;
> >>> +
> >>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> >>
> >> It's no longer indented to deep, no need to keep such aggressive wrapping
> >>
> > 
> > The pmic_arb_get_obsrvr_chnls_v2 is used by both:
> > pmic_arb_get_core_resources_v2
> > pmic_arb_get_core_resources_v7
> 
> I meant line wrapping

Oh, ok. Will do.

> 
> > 
> >>> +					   "obsrvr");
> >>> +	pmic_arb->rd_base = devm_ioremap(dev, res->start,
> >>> +					 resource_size(res));
> >>> +	if (IS_ERR(pmic_arb->rd_base))
> >>> +		return PTR_ERR(pmic_arb->rd_base);
> >>> +
> >>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> >>> +					   "chnls");
> >>> +	pmic_arb->wr_base = devm_ioremap(dev, res->start,
> >>> +					 resource_size(res));
> >>> +	if (IS_ERR(pmic_arb->wr_base))
> >>> +		return PTR_ERR(pmic_arb->wr_base);
> >>
> >> Could probably make it "devm_platform_get_and_ioremap_resource "
> > 
> > The reason this needs to stay as is is because of reason explained by
> > the following comment found in probe:
> > 
> > /*                                                                           
> >  * Please don't replace this with devm_platform_ioremap_resource() or        
> >  * devm_ioremap_resource().  These both result in a call to                  
> >  * devm_request_mem_region() which prevents multiple mappings of this        
> >  * register address range.  SoCs with PMIC arbiter v7 may define two         
> >  * arbiter devices, for the two physical SPMI interfaces, which  share       
> >  * some register address ranges (i.e. "core", "obsrvr", and "chnls").        
> >  * Ensure that both devices probe successfully by calling devm_ioremap()     
> >  * which does not result in a devm_request_mem_region() call.                
> >  */                                                                          
> > 
> > Even though, AFAICT, there is no platform that adds a second node for
> > the second bus, currently, in mainline, we should probably allow the
> > "legacy" approach to still work.
> 
> OK right, let's keep it.
> 
> Konrad
Dmitry Baryshkov Feb. 15, 2024, 9:30 a.m. UTC | #4 
On Wed, 14 Feb 2024 at 23:36, Abel Vesa <abel.vesa@linaro.org> wrote:
>
> On 24-02-14 22:18:33, Konrad Dybcio wrote:
> > On 14.02.2024 22:13, Abel Vesa wrote:
> > > Rather than setting up the core, obsrv and chnls in probe by using
> > > version specific conditionals, add a dedicated "get_core_resources"
> > > version specific op and move the acquiring in there.
> > >
> > > Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> > > ---
> > >  drivers/spmi/spmi-pmic-arb.c | 111 ++++++++++++++++++++++++++++++-------------
> > >  1 file changed, 78 insertions(+), 33 deletions(-)
> > >
> > > diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
> > > index 23939c0d225f..489556467a4c 100644
> > > --- a/drivers/spmi/spmi-pmic-arb.c
> > > +++ b/drivers/spmi/spmi-pmic-arb.c
> > > @@ -203,6 +203,7 @@ struct spmi_pmic_arb {
> > >   */
> > >  struct pmic_arb_ver_ops {
> > >     const char *ver_str;
> > > +   int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
> > >     int (*init_apid)(struct spmi_pmic_arb *pmic_arb, int index);
> > >     int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
> > >     /* spmi commands (read_cmd, write_cmd, cmd) functionality */
> > > @@ -956,6 +957,19 @@ static int pmic_arb_init_apid_min_max(struct spmi_pmic_arb *pmic_arb)
> > >     return 0;
> > >  }
> > >
> > > +static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
> > > +                                     void __iomem *core)
> > > +{
> > > +   struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> > > +
> > > +   pmic_arb->wr_base = core;
> > > +   pmic_arb->rd_base = core;
> > > +
> > > +   pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
> > > +
> > > +   return 0;
> > > +}
> > > +
> > >  static int pmic_arb_init_apid_v1(struct spmi_pmic_arb *pmic_arb, int index)
> > >  {
> > >     u32 *mapping_table;
> > > @@ -1063,6 +1077,41 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
> > >     return apid;
> > >  }
> > >
> > > +static int pmic_arb_get_obsrvr_chnls_v2(struct platform_device *pdev)
> > > +{
> > > +   struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> > > +   struct device *dev = &pdev->dev;
> > > +   struct resource *res;
> > > +
> > > +   res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> >
> > It's no longer indented to deep, no need to keep such aggressive wrapping
> >
>
> The pmic_arb_get_obsrvr_chnls_v2 is used by both:
> pmic_arb_get_core_resources_v2
> pmic_arb_get_core_resources_v7
>
> > > +                                      "obsrvr");
> > > +   pmic_arb->rd_base = devm_ioremap(dev, res->start,
> > > +                                    resource_size(res));
> > > +   if (IS_ERR(pmic_arb->rd_base))
> > > +           return PTR_ERR(pmic_arb->rd_base);
> > > +
> > > +   res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > > +                                      "chnls");
> > > +   pmic_arb->wr_base = devm_ioremap(dev, res->start,
> > > +                                    resource_size(res));
> > > +   if (IS_ERR(pmic_arb->wr_base))
> > > +           return PTR_ERR(pmic_arb->wr_base);
> >
> > Could probably make it "devm_platform_get_and_ioremap_resource "
>
> The reason this needs to stay as is is because of reason explained by
> the following comment found in probe:
>
> /*
>  * Please don't replace this with devm_platform_ioremap_resource() or
>  * devm_ioremap_resource().  These both result in a call to
>  * devm_request_mem_region() which prevents multiple mappings of this
>  * register address range.  SoCs with PMIC arbiter v7 may define two
>  * arbiter devices, for the two physical SPMI interfaces, which  share
>  * some register address ranges (i.e. "core", "obsrvr", and "chnls").
>  * Ensure that both devices probe successfully by calling devm_ioremap()
>  * which does not result in a devm_request_mem_region() call.
>  */
>
> Even though, AFAICT, there is no platform that adds a second node for
> the second bus, currently, in mainline, we should probably allow the
> "legacy" approach to still work.

If there were no DT files which used two SPMI devices, I think we
should drop this comment and use existing helpers. We must keep
compatibility with the existing DTs, not with the _possible_ device
trees.

>
> >
> > Konrad
Abel Vesa Feb. 15, 2024, 1:32 p.m. UTC | #5 
On 24-02-15 11:30:23, Dmitry Baryshkov wrote:
> On Wed, 14 Feb 2024 at 23:36, Abel Vesa <abel.vesa@linaro.org> wrote:
> >
> > On 24-02-14 22:18:33, Konrad Dybcio wrote:
> > > On 14.02.2024 22:13, Abel Vesa wrote:
> > > > Rather than setting up the core, obsrv and chnls in probe by using
> > > > version specific conditionals, add a dedicated "get_core_resources"
> > > > version specific op and move the acquiring in there.
> > > >
> > > > Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> > > > ---
> > > >  drivers/spmi/spmi-pmic-arb.c | 111 ++++++++++++++++++++++++++++++-------------
> > > >  1 file changed, 78 insertions(+), 33 deletions(-)
> > > >
> > > > diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
> > > > index 23939c0d225f..489556467a4c 100644
> > > > --- a/drivers/spmi/spmi-pmic-arb.c
> > > > +++ b/drivers/spmi/spmi-pmic-arb.c
> > > > @@ -203,6 +203,7 @@ struct spmi_pmic_arb {
> > > >   */
> > > >  struct pmic_arb_ver_ops {
> > > >     const char *ver_str;
> > > > +   int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
> > > >     int (*init_apid)(struct spmi_pmic_arb *pmic_arb, int index);
> > > >     int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
> > > >     /* spmi commands (read_cmd, write_cmd, cmd) functionality */
> > > > @@ -956,6 +957,19 @@ static int pmic_arb_init_apid_min_max(struct spmi_pmic_arb *pmic_arb)
> > > >     return 0;
> > > >  }
> > > >
> > > > +static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
> > > > +                                     void __iomem *core)
> > > > +{
> > > > +   struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> > > > +
> > > > +   pmic_arb->wr_base = core;
> > > > +   pmic_arb->rd_base = core;
> > > > +
> > > > +   pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
> > > > +
> > > > +   return 0;
> > > > +}
> > > > +
> > > >  static int pmic_arb_init_apid_v1(struct spmi_pmic_arb *pmic_arb, int index)
> > > >  {
> > > >     u32 *mapping_table;
> > > > @@ -1063,6 +1077,41 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
> > > >     return apid;
> > > >  }
> > > >
> > > > +static int pmic_arb_get_obsrvr_chnls_v2(struct platform_device *pdev)
> > > > +{
> > > > +   struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> > > > +   struct device *dev = &pdev->dev;
> > > > +   struct resource *res;
> > > > +
> > > > +   res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > >
> > > It's no longer indented to deep, no need to keep such aggressive wrapping
> > >
> >
> > The pmic_arb_get_obsrvr_chnls_v2 is used by both:
> > pmic_arb_get_core_resources_v2
> > pmic_arb_get_core_resources_v7
> >
> > > > +                                      "obsrvr");
> > > > +   pmic_arb->rd_base = devm_ioremap(dev, res->start,
> > > > +                                    resource_size(res));
> > > > +   if (IS_ERR(pmic_arb->rd_base))
> > > > +           return PTR_ERR(pmic_arb->rd_base);
> > > > +
> > > > +   res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > > > +                                      "chnls");
> > > > +   pmic_arb->wr_base = devm_ioremap(dev, res->start,
> > > > +                                    resource_size(res));
> > > > +   if (IS_ERR(pmic_arb->wr_base))
> > > > +           return PTR_ERR(pmic_arb->wr_base);
> > >
> > > Could probably make it "devm_platform_get_and_ioremap_resource "
> >
> > The reason this needs to stay as is is because of reason explained by
> > the following comment found in probe:
> >
> > /*
> >  * Please don't replace this with devm_platform_ioremap_resource() or
> >  * devm_ioremap_resource().  These both result in a call to
> >  * devm_request_mem_region() which prevents multiple mappings of this
> >  * register address range.  SoCs with PMIC arbiter v7 may define two
> >  * arbiter devices, for the two physical SPMI interfaces, which  share
> >  * some register address ranges (i.e. "core", "obsrvr", and "chnls").
> >  * Ensure that both devices probe successfully by calling devm_ioremap()
> >  * which does not result in a devm_request_mem_region() call.
> >  */
> >
> > Even though, AFAICT, there is no platform that adds a second node for
> > the second bus, currently, in mainline, we should probably allow the
> > "legacy" approach to still work.
> 
> If there were no DT files which used two SPMI devices, I think we
> should drop this comment and use existing helpers. We must keep
> compatibility with the existing DTs, not with the _possible_ device
> trees.

Sure.

Should I drop the qcom,bus-id from the driver as well? It is optional
after all.

> 
> >
> > >
> > > Konrad
> 
> 
> 
> -- 
> With best wishes
> Dmitry
Dmitry Baryshkov Feb. 15, 2024, 2:42 p.m. UTC | #6 
On Thu, 15 Feb 2024 at 15:32, Abel Vesa <abel.vesa@linaro.org> wrote:
>
> On 24-02-15 11:30:23, Dmitry Baryshkov wrote:
> > On Wed, 14 Feb 2024 at 23:36, Abel Vesa <abel.vesa@linaro.org> wrote:
> > >
> > > On 24-02-14 22:18:33, Konrad Dybcio wrote:
> > > > On 14.02.2024 22:13, Abel Vesa wrote:
> > > > > Rather than setting up the core, obsrv and chnls in probe by using
> > > > > version specific conditionals, add a dedicated "get_core_resources"
> > > > > version specific op and move the acquiring in there.
> > > > >
> > > > > Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> > > > > ---
> > > > >  drivers/spmi/spmi-pmic-arb.c | 111 ++++++++++++++++++++++++++++++-------------
> > > > >  1 file changed, 78 insertions(+), 33 deletions(-)
> > > > >
> > > > > diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
> > > > > index 23939c0d225f..489556467a4c 100644
> > > > > --- a/drivers/spmi/spmi-pmic-arb.c
> > > > > +++ b/drivers/spmi/spmi-pmic-arb.c
> > > > > @@ -203,6 +203,7 @@ struct spmi_pmic_arb {
> > > > >   */
> > > > >  struct pmic_arb_ver_ops {
> > > > >     const char *ver_str;
> > > > > +   int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
> > > > >     int (*init_apid)(struct spmi_pmic_arb *pmic_arb, int index);
> > > > >     int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
> > > > >     /* spmi commands (read_cmd, write_cmd, cmd) functionality */
> > > > > @@ -956,6 +957,19 @@ static int pmic_arb_init_apid_min_max(struct spmi_pmic_arb *pmic_arb)
> > > > >     return 0;
> > > > >  }
> > > > >
> > > > > +static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
> > > > > +                                     void __iomem *core)
> > > > > +{
> > > > > +   struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> > > > > +
> > > > > +   pmic_arb->wr_base = core;
> > > > > +   pmic_arb->rd_base = core;
> > > > > +
> > > > > +   pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
> > > > > +
> > > > > +   return 0;
> > > > > +}
> > > > > +
> > > > >  static int pmic_arb_init_apid_v1(struct spmi_pmic_arb *pmic_arb, int index)
> > > > >  {
> > > > >     u32 *mapping_table;
> > > > > @@ -1063,6 +1077,41 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
> > > > >     return apid;
> > > > >  }
> > > > >
> > > > > +static int pmic_arb_get_obsrvr_chnls_v2(struct platform_device *pdev)
> > > > > +{
> > > > > +   struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> > > > > +   struct device *dev = &pdev->dev;
> > > > > +   struct resource *res;
> > > > > +
> > > > > +   res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > > >
> > > > It's no longer indented to deep, no need to keep such aggressive wrapping
> > > >
> > >
> > > The pmic_arb_get_obsrvr_chnls_v2 is used by both:
> > > pmic_arb_get_core_resources_v2
> > > pmic_arb_get_core_resources_v7
> > >
> > > > > +                                      "obsrvr");
> > > > > +   pmic_arb->rd_base = devm_ioremap(dev, res->start,
> > > > > +                                    resource_size(res));
> > > > > +   if (IS_ERR(pmic_arb->rd_base))
> > > > > +           return PTR_ERR(pmic_arb->rd_base);
> > > > > +
> > > > > +   res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > > > > +                                      "chnls");
> > > > > +   pmic_arb->wr_base = devm_ioremap(dev, res->start,
> > > > > +                                    resource_size(res));
> > > > > +   if (IS_ERR(pmic_arb->wr_base))
> > > > > +           return PTR_ERR(pmic_arb->wr_base);
> > > >
> > > > Could probably make it "devm_platform_get_and_ioremap_resource "
> > >
> > > The reason this needs to stay as is is because of reason explained by
> > > the following comment found in probe:
> > >
> > > /*
> > >  * Please don't replace this with devm_platform_ioremap_resource() or
> > >  * devm_ioremap_resource().  These both result in a call to
> > >  * devm_request_mem_region() which prevents multiple mappings of this
> > >  * register address range.  SoCs with PMIC arbiter v7 may define two
> > >  * arbiter devices, for the two physical SPMI interfaces, which  share
> > >  * some register address ranges (i.e. "core", "obsrvr", and "chnls").
> > >  * Ensure that both devices probe successfully by calling devm_ioremap()
> > >  * which does not result in a devm_request_mem_region() call.
> > >  */
> > >
> > > Even though, AFAICT, there is no platform that adds a second node for
> > > the second bus, currently, in mainline, we should probably allow the
> > > "legacy" approach to still work.
> >
> > If there were no DT files which used two SPMI devices, I think we
> > should drop this comment and use existing helpers. We must keep
> > compatibility with the existing DTs, not with the _possible_ device
> > trees.
>
> Sure.
>
> Should I drop the qcom,bus-id from the driver as well? It is optional
> after all.

I think so. Let's drop it completely. And for the new sub-devices you
perfectly know the bus ID.
diff mbox series

Patch

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 23939c0d225f..489556467a4c 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -203,6 +203,7 @@  struct spmi_pmic_arb {
  */
 struct pmic_arb_ver_ops {
 	const char *ver_str;
+	int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
 	int (*init_apid)(struct spmi_pmic_arb *pmic_arb, int index);
 	int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
 	/* spmi commands (read_cmd, write_cmd, cmd) functionality */
@@ -956,6 +957,19 @@  static int pmic_arb_init_apid_min_max(struct spmi_pmic_arb *pmic_arb)
 	return 0;
 }
 
+static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
+					  void __iomem *core)
+{
+	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
+
+	pmic_arb->wr_base = core;
+	pmic_arb->rd_base = core;
+
+	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
+
+	return 0;
+}
+
 static int pmic_arb_init_apid_v1(struct spmi_pmic_arb *pmic_arb, int index)
 {
 	u32 *mapping_table;
@@ -1063,6 +1077,41 @@  static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
 	return apid;
 }
 
+static int pmic_arb_get_obsrvr_chnls_v2(struct platform_device *pdev)
+{
+	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+					   "obsrvr");
+	pmic_arb->rd_base = devm_ioremap(dev, res->start,
+					 resource_size(res));
+	if (IS_ERR(pmic_arb->rd_base))
+		return PTR_ERR(pmic_arb->rd_base);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+					   "chnls");
+	pmic_arb->wr_base = devm_ioremap(dev, res->start,
+					 resource_size(res));
+	if (IS_ERR(pmic_arb->wr_base))
+		return PTR_ERR(pmic_arb->wr_base);
+
+	return 0;
+}
+
+static int pmic_arb_get_core_resources_v2(struct platform_device *pdev,
+					  void __iomem *core)
+{
+	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
+
+	pmic_arb->core = core;
+
+	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
+
+	return pmic_arb_get_obsrvr_chnls_v2(pdev);
+}
+
 static int pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pmic_arb, u16 ppid)
 {
 	u16 apid_valid;
@@ -1246,6 +1295,18 @@  static int pmic_arb_offset_v5(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr,
 	return offset;
 }
 
+static int pmic_arb_get_core_resources_v7(struct platform_device *pdev,
+					  void __iomem *core)
+{
+	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
+
+	pmic_arb->core = core;
+
+	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS_V7;
+
+	return pmic_arb_get_obsrvr_chnls_v2(pdev);
+}
+
 /*
  * Only v7 supports 2 bus buses. Each bus will get a different apid count,
  * read from different registers.
@@ -1469,6 +1530,7 @@  pmic_arb_apid_owner_v7(struct spmi_pmic_arb *pmic_arb, u16 n)
 
 static const struct pmic_arb_ver_ops pmic_arb_v1 = {
 	.ver_str		= "v1",
+	.get_core_resources	= pmic_arb_get_core_resources_v1,
 	.init_apid		= pmic_arb_init_apid_v1,
 	.ppid_to_apid		= pmic_arb_ppid_to_apid_v1,
 	.non_data_cmd		= pmic_arb_non_data_cmd_v1,
@@ -1484,6 +1546,7 @@  static const struct pmic_arb_ver_ops pmic_arb_v1 = {
 
 static const struct pmic_arb_ver_ops pmic_arb_v2 = {
 	.ver_str		= "v2",
+	.get_core_resources	= pmic_arb_get_core_resources_v2,
 	.init_apid		= pmic_arb_init_apid_v1,
 	.ppid_to_apid		= pmic_arb_ppid_to_apid_v2,
 	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
@@ -1499,6 +1562,7 @@  static const struct pmic_arb_ver_ops pmic_arb_v2 = {
 
 static const struct pmic_arb_ver_ops pmic_arb_v3 = {
 	.ver_str		= "v3",
+	.get_core_resources	= pmic_arb_get_core_resources_v2,
 	.init_apid		= pmic_arb_init_apid_v1,
 	.ppid_to_apid		= pmic_arb_ppid_to_apid_v2,
 	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
@@ -1514,6 +1578,7 @@  static const struct pmic_arb_ver_ops pmic_arb_v3 = {
 
 static const struct pmic_arb_ver_ops pmic_arb_v5 = {
 	.ver_str		= "v5",
+	.get_core_resources	= pmic_arb_get_core_resources_v2,
 	.init_apid		= pmic_arb_init_apid_v5,
 	.ppid_to_apid		= pmic_arb_ppid_to_apid_v5,
 	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
@@ -1529,6 +1594,7 @@  static const struct pmic_arb_ver_ops pmic_arb_v5 = {
 
 static const struct pmic_arb_ver_ops pmic_arb_v7 = {
 	.ver_str		= "v7",
+	.get_core_resources	= pmic_arb_get_core_resources_v7,
 	.init_apid		= pmic_arb_init_apid_v7,
 	.ppid_to_apid		= pmic_arb_ppid_to_apid_v5,
 	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
@@ -1584,44 +1650,23 @@  static int spmi_pmic_arb_probe(struct platform_device *pdev)
 
 	hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
 
-	if (hw_ver < PMIC_ARB_VERSION_V2_MIN) {
+	if (hw_ver < PMIC_ARB_VERSION_V2_MIN)
 		pmic_arb->ver_ops = &pmic_arb_v1;
-		pmic_arb->wr_base = core;
-		pmic_arb->rd_base = core;
-	} else {
-		pmic_arb->core = core;
-
-		if (hw_ver < PMIC_ARB_VERSION_V3_MIN)
-			pmic_arb->ver_ops = &pmic_arb_v2;
-		else if (hw_ver < PMIC_ARB_VERSION_V5_MIN)
-			pmic_arb->ver_ops = &pmic_arb_v3;
-		else if (hw_ver < PMIC_ARB_VERSION_V7_MIN)
-			pmic_arb->ver_ops = &pmic_arb_v5;
-		else
-			pmic_arb->ver_ops = &pmic_arb_v7;
-
-		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
-						   "obsrvr");
-		pmic_arb->rd_base = devm_ioremap(&ctrl->dev, res->start,
-						 resource_size(res));
-		if (IS_ERR(pmic_arb->rd_base))
-			return PTR_ERR(pmic_arb->rd_base);
-
-		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
-						   "chnls");
-		pmic_arb->wr_base = devm_ioremap(&ctrl->dev, res->start,
-						 resource_size(res));
-		if (IS_ERR(pmic_arb->wr_base))
-			return PTR_ERR(pmic_arb->wr_base);
-	}
+	else if (hw_ver < PMIC_ARB_VERSION_V3_MIN)
+		pmic_arb->ver_ops = &pmic_arb_v2;
+	else if (hw_ver < PMIC_ARB_VERSION_V5_MIN)
+		pmic_arb->ver_ops = &pmic_arb_v3;
+	else if (hw_ver < PMIC_ARB_VERSION_V7_MIN)
+		pmic_arb->ver_ops = &pmic_arb_v5;
+	else
+		pmic_arb->ver_ops = &pmic_arb_v7;
 
 	dev_info(&ctrl->dev, "PMIC arbiter version %s (0x%x)\n",
 		 pmic_arb->ver_ops->ver_str, hw_ver);
 
-	if (hw_ver < PMIC_ARB_VERSION_V7_MIN)
-		pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
-	else
-		pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS_V7;
+	err = pmic_arb->ver_ops->get_core_resources(pdev, core);
+	if (err)
+		return err;
 
 	err = pmic_arb->ver_ops->init_apid(pmic_arb, 0);
 	if (err)