diff mbox series

[3/3] arm64: dts: exynos: Rename compatible string property from version to SOC specific

Message ID 20221102130602.48969-3-aakarsh.jain@samsung.com
State New
Headers
Series [1/3] arm64: exynos: Add new compatible string for Exynos3250 SoC. |

Commit Message

Aakarsh Jain Nov. 2, 2022, 1:06 p.m. UTC 
  commit "752d3a23d1f68de87e3c" which adds MFC codec device node
for exynos3250 SOC. Since exynos3250.dtsi and exynos5420.dtsi are
using same compatible string as "samsung,mfc-v7" but their
node properties are different.As both SoCs have MFC v7 hardware
module but with different clock hierarchy and complexity.
So renaming compatible string from version specific to SOC based.

Suggested-by: Alim Akhtar <alim.akhtar@samsung.com>
Fixes: 752d3a23d1f6 ("ARM: dts: add MFC codec device node for exynos3250")
Signed-off-by: Aakarsh Jain <aakarsh.jain@samsung.com>
---
 arch/arm/boot/dts/exynos3250.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Tommaso Merciai Nov. 3, 2022, 10:56 a.m. UTC | #1 
Hi Aakarsh,

On Wed, Nov 02, 2022 at 06:36:02PM +0530, Aakarsh Jain wrote:
> commit "752d3a23d1f68de87e3c" which adds MFC codec device node
> for exynos3250 SOC. Since exynos3250.dtsi and exynos5420.dtsi are
> using same compatible string as "samsung,mfc-v7" but their
> node properties are different.As both SoCs have MFC v7 hardware
> module but with different clock hierarchy and complexity.
> So renaming compatible string from version specific to SOC based.
> 
> Suggested-by: Alim Akhtar <alim.akhtar@samsung.com>
> Fixes: 752d3a23d1f6 ("ARM: dts: add MFC codec device node for exynos3250")
> Signed-off-by: Aakarsh Jain <aakarsh.jain@samsung.com>
> ---
>  arch/arm/boot/dts/exynos3250.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
> index 326b9e0ed8d3..98105c64f7d9 100644
> --- a/arch/arm/boot/dts/exynos3250.dtsi
> +++ b/arch/arm/boot/dts/exynos3250.dtsi
> @@ -485,7 +485,7 @@
>  		};
>  
>  		mfc: codec@13400000 {
> -			compatible = "samsung,mfc-v7";
> +			compatible = "samsung,exynos3250-mfc";
>  			reg = <0x13400000 0x10000>;
>  			interrupts = <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>;
>  			clock-names = "mfc", "sclk_mfc";
> -- 
> 2.17.1
> 

Looks good to me.
Reviewed-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>


Regards,
Tommaso
Krzysztof Kozlowski Nov. 3, 2022, 12:33 p.m. UTC | #2 
On 02/11/2022 09:06, Aakarsh Jain wrote:
> commit "752d3a23d1f68de87e3c" which adds MFC codec device node
> for exynos3250 SOC. Since exynos3250.dtsi and exynos5420.dtsi are
> using same compatible string as "samsung,mfc-v7" but their
> node properties are different.As both SoCs have MFC v7 hardware
> module but with different clock hierarchy and complexity.
> So renaming compatible string from version specific to SOC based.
> 
> Suggested-by: Alim Akhtar <alim.akhtar@samsung.com>
> Fixes: 752d3a23d1f6 ("ARM: dts: add MFC codec device node for exynos3250")

There is no bug to fix and backporting is forbidden as it breaks the
usage of DTS in older kernel.

> Signed-off-by: Aakarsh Jain <aakarsh.jain@samsung.com>
> ---
>  arch/arm/boot/dts/exynos3250.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
> index 326b9e0ed8d3..98105c64f7d9 100644
> --- a/arch/arm/boot/dts/exynos3250.dtsi
> +++ b/arch/arm/boot/dts/exynos3250.dtsi
> @@ -485,7 +485,7 @@
>  		};
>  
>  		mfc: codec@13400000 {
> -			compatible = "samsung,mfc-v7";
> +			compatible = "samsung,exynos3250-mfc";

The change is non-bisectable and breaks using DTS in older kernel.

Best regards,
Krzysztof
Aakarsh Jain Nov. 4, 2022, 10:49 a.m. UTC | #3 
> -----Original Message-----
> From: Krzysztof Kozlowski [mailto:krzysztof.kozlowski@linaro.org]
> Sent: 03 November 2022 18:04
> To: Aakarsh Jain <aakarsh.jain@samsung.com>; linux-arm-
> kernel@lists.infradead.org; linux-media@vger.kernel.org; linux-
> kernel@vger.kernel.org; devicetree@vger.kernel.org
> Cc: m.szyprowski@samsung.com; andrzej.hajda@intel.com;
> mchehab@kernel.org; hverkuil-cisco@xs4all.nl;
> ezequiel@vanguardiasur.com.ar; jernej.skrabec@gmail.com;
> benjamin.gaignard@collabora.com; krzysztof.kozlowski+dt@linaro.org;
> stanimir.varbanov@linaro.org; dillon.minfei@gmail.com;
> david.plowman@raspberrypi.com; mark.rutland@arm.com;
> robh+dt@kernel.org; krzk+dt@kernel.org; andi@etezian.org;
> alim.akhtar@samsung.com; aswani.reddy@samsung.com;
> pankaj.dubey@samsung.com; smitha.t@samsung.com
> Subject: Re: [PATCH 3/3] arm64: dts: exynos: Rename compatible string
> property from version to SOC specific
> 
> On 02/11/2022 09:06, Aakarsh Jain wrote:
> > commit "752d3a23d1f68de87e3c" which adds MFC codec device node for
> > exynos3250 SOC. Since exynos3250.dtsi and exynos5420.dtsi are using
> > same compatible string as "samsung,mfc-v7" but their node properties
> > are different.As both SoCs have MFC v7 hardware module but with
> > different clock hierarchy and complexity.
> > So renaming compatible string from version specific to SOC based.
> >
> > Suggested-by: Alim Akhtar <alim.akhtar@samsung.com>
> > Fixes: 752d3a23d1f6 ("ARM: dts: add MFC codec device node for
> > exynos3250")
> 
> There is no bug to fix and backporting is forbidden as it breaks the usage of
> DTS in older kernel.
> 
Okay will remove this Fix tag in next series.
> > Signed-off-by: Aakarsh Jain <aakarsh.jain@samsung.com>
> > ---
> >  arch/arm/boot/dts/exynos3250.dtsi | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/arm/boot/dts/exynos3250.dtsi
> > b/arch/arm/boot/dts/exynos3250.dtsi
> > index 326b9e0ed8d3..98105c64f7d9 100644
> > --- a/arch/arm/boot/dts/exynos3250.dtsi
> > +++ b/arch/arm/boot/dts/exynos3250.dtsi
> > @@ -485,7 +485,7 @@
> >  		};
> >
> >  		mfc: codec@13400000 {
> > -			compatible = "samsung,mfc-v7";
> > +			compatible = "samsung,exynos3250-mfc";
> 
> The change is non-bisectable and breaks using DTS in older kernel.
> 
Right, so what is your suggestion on this?
I can see two ways here:
1> To squash patch2 and patch3 in one?
2> Have a warning about this breakage in the patch-3 commit message?

> Best regards,
> Krzysztof


Thanks for the review.
Krzysztof Kozlowski Nov. 4, 2022, 12:53 p.m. UTC | #4 
On 04/11/2022 06:49, Aakarsh Jain wrote:
> 
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski [mailto:krzysztof.kozlowski@linaro.org]
>> Sent: 03 November 2022 18:04
>> To: Aakarsh Jain <aakarsh.jain@samsung.com>; linux-arm-
>> kernel@lists.infradead.org; linux-media@vger.kernel.org; linux-
>> kernel@vger.kernel.org; devicetree@vger.kernel.org
>> Cc: m.szyprowski@samsung.com; andrzej.hajda@intel.com;
>> mchehab@kernel.org; hverkuil-cisco@xs4all.nl;
>> ezequiel@vanguardiasur.com.ar; jernej.skrabec@gmail.com;
>> benjamin.gaignard@collabora.com; krzysztof.kozlowski+dt@linaro.org;
>> stanimir.varbanov@linaro.org; dillon.minfei@gmail.com;
>> david.plowman@raspberrypi.com; mark.rutland@arm.com;
>> robh+dt@kernel.org; krzk+dt@kernel.org; andi@etezian.org;
>> alim.akhtar@samsung.com; aswani.reddy@samsung.com;
>> pankaj.dubey@samsung.com; smitha.t@samsung.com
>> Subject: Re: [PATCH 3/3] arm64: dts: exynos: Rename compatible string
>> property from version to SOC specific
>>
>> On 02/11/2022 09:06, Aakarsh Jain wrote:
>>> commit "752d3a23d1f68de87e3c" which adds MFC codec device node for
>>> exynos3250 SOC. Since exynos3250.dtsi and exynos5420.dtsi are using
>>> same compatible string as "samsung,mfc-v7" but their node properties
>>> are different.As both SoCs have MFC v7 hardware module but with
>>> different clock hierarchy and complexity.
>>> So renaming compatible string from version specific to SOC based.
>>>
>>> Suggested-by: Alim Akhtar <alim.akhtar@samsung.com>
>>> Fixes: 752d3a23d1f6 ("ARM: dts: add MFC codec device node for
>>> exynos3250")
>>
>> There is no bug to fix and backporting is forbidden as it breaks the usage of
>> DTS in older kernel.
>>
> Okay will remove this Fix tag in next series.
>>> Signed-off-by: Aakarsh Jain <aakarsh.jain@samsung.com>
>>> ---
>>>  arch/arm/boot/dts/exynos3250.dtsi | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm/boot/dts/exynos3250.dtsi
>>> b/arch/arm/boot/dts/exynos3250.dtsi
>>> index 326b9e0ed8d3..98105c64f7d9 100644
>>> --- a/arch/arm/boot/dts/exynos3250.dtsi
>>> +++ b/arch/arm/boot/dts/exynos3250.dtsi
>>> @@ -485,7 +485,7 @@
>>>  		};
>>>
>>>  		mfc: codec@13400000 {
>>> -			compatible = "samsung,mfc-v7";
>>> +			compatible = "samsung,exynos3250-mfc";
>>
>> The change is non-bisectable and breaks using DTS in older kernel.
>>
> Right, so what is your suggestion on this?
> I can see two ways here:
> 1> To squash patch2 and patch3 in one?
> 2> Have a warning about this breakage in the patch-3 commit message?

Here - nothing except implementing bindings. The suggestion was given to
the bindings patch - use fallback.

Best regards,
Krzysztof
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
index 326b9e0ed8d3..98105c64f7d9 100644
--- a/arch/arm/boot/dts/exynos3250.dtsi
+++ b/arch/arm/boot/dts/exynos3250.dtsi
@@ -485,7 +485,7 @@ 
 		};
 
 		mfc: codec@13400000 {
-			compatible = "samsung,mfc-v7";
+			compatible = "samsung,exynos3250-mfc";
 			reg = <0x13400000 0x10000>;
 			interrupts = <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>;
 			clock-names = "mfc", "sclk_mfc";