diff mbox series

[RFC,v2,5/6] ARM: pxa: Convert Spitz hsync to GPIO descriptors

Message ID 20230926-pxa-gpio-v2-5-984464d165dd@skole.hr
State New
Headers
Series ARM: pxa: GPIO descriptor conversions |

Commit Message

Duje Mihanović Sept. 26, 2023, 3:46 p.m. UTC 
  Sharp's Spitz still uses the legacy GPIO interface in its
wait_for_hsync() function.

Convert it to use the GPIO descriptor interface.

Signed-off-by: Duje Mihanović <duje.mihanovic@skole.hr>
---
 arch/arm/mach-pxa/spitz.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

Comments

andy@kernel.org Sept. 26, 2023, 4:19 p.m. UTC | #1 
On Tue, Sep 26, 2023 at 05:46:26PM +0200, Duje Mihanović wrote:
> Sharp's Spitz still uses the legacy GPIO interface in its
> wait_for_hsync() function.
> 
> Convert it to use the GPIO descriptor interface.

...

> +static struct gpio_desc *hsync = NULL;

Assignment is redundant.

...

>  	gpiod_add_lookup_table(&spitz_ads7846_gpio_table);
>  	gpiod_add_lookup_table(&spitz_spi_gpio_table);
> +	hsync = gpiod_get(NULL, "hsync", GPIOD_IN);
> +	if (IS_ERR(hsync)) {
> +		pr_err("Failed to get hsync GPIO: %ld\n", PTR_ERR(hsync));
> +		return;
> +	}
>  	pxa2xx_set_spi_info(2, &spitz_spi_info);
>  	spi_register_board_info(ARRAY_AND_SIZE(spitz_spi_devices));

Yeah, but the question is, if GPIO request fails, can we instantiate at least
one device and move on?
Duje Mihanović Sept. 27, 2023, 12:54 p.m. UTC | #2 
On Tuesday, September 26, 2023 6:19:23 PM CEST Andy Shevchenko wrote:
> On Tue, Sep 26, 2023 at 05:46:26PM +0200, Duje Mihanović wrote:
> >  	gpiod_add_lookup_table(&spitz_ads7846_gpio_table);
> >  	gpiod_add_lookup_table(&spitz_spi_gpio_table);
> > 
> > +	hsync = gpiod_get(NULL, "hsync", GPIOD_IN);
> > +	if (IS_ERR(hsync)) {
> > +		pr_err("Failed to get hsync GPIO: %ld\n", PTR_ERR(hsync));
> > +		return;
> > +	}
> > 
> >  	pxa2xx_set_spi_info(2, &spitz_spi_info);
> >  	spi_register_board_info(ARRAY_AND_SIZE(spitz_spi_devices));
> 
> Yeah, but the question is, if GPIO request fails, can we instantiate at 
least one device and move on?

I see. If the touchscreen is the first out of 3 devices in that array, would 
something like this do:

spi_register_board_info(ARRAY_AND_SIZE(&spitz_spi_devices[1]));

Regards,
Duje
diff mbox series

Patch

diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index 94bcb187713b..5c8f497b71ec 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -520,12 +520,14 @@  static inline void spitz_leds_init(void) {}
  * SSP Devices
  ******************************************************************************/
 #if defined(CONFIG_SPI_PXA2XX) || defined(CONFIG_SPI_PXA2XX_MODULE)
+static struct gpio_desc *hsync = NULL;
+
 static void spitz_ads7846_wait_for_hsync(void)
 {
-	while (gpio_get_value(SPITZ_GPIO_HSYNC))
+	while (gpiod_get_value(hsync))
 		cpu_relax();
 
-	while (!gpio_get_value(SPITZ_GPIO_HSYNC))
+	while (!gpiod_get_value(hsync))
 		cpu_relax();
 }
 
@@ -543,6 +545,8 @@  static struct gpiod_lookup_table spitz_ads7846_gpio_table = {
 	.table = {
 		GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_TP_INT,
 			    "pendown", GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_HSYNC,
+			    "hsync", GPIO_ACTIVE_LOW),
 		{ }
 	},
 };
@@ -622,6 +626,11 @@  static void __init spitz_spi_init(void)
 
 	gpiod_add_lookup_table(&spitz_ads7846_gpio_table);
 	gpiod_add_lookup_table(&spitz_spi_gpio_table);
+	hsync = gpiod_get(NULL, "hsync", GPIOD_IN);
+	if (IS_ERR(hsync)) {
+		pr_err("Failed to get hsync GPIO: %ld\n", PTR_ERR(hsync));
+		return;
+	}
 	pxa2xx_set_spi_info(2, &spitz_spi_info);
 	spi_register_board_info(ARRAY_AND_SIZE(spitz_spi_devices));
 }