Subject: [PATCH 3/3] ARM: mach-shmobile: lager: support GPIO switches

From: [email-masked] (Laurent Pinchart)
Date: Tue, 14 May 2013 00:35:20 +0200

Hi Simon,

Thank you for the patch.

On Monday 13 May 2013 17:53:53 Simon Horman wrote:
> The lager board has pins 1 - 4 of SW2 wired up to GPIO pins.
> This patch allows access to those pins as KEYS 1 - 4 using
> gpio-keys.
> 
> Signed-off-by: Simon Horman <[email-masked]>
> 
> ---
> 
> This patch has run time dependencies on
> 1. "gpio-rcar: Add support for IRQ_TYPE_EDGE_BOTH"
> 2. "ARM: shmobile: r8a7790: Configure R-Car GPIO for IRQ_TYPE_EDGE_BOTH"
> 
> Without those dependencies satisfied the gpio-keys driver will
> fail to be initialise itself. The boot should be otherwise successful
> and the board otherwise functional.
> ---
>  arch/arm/mach-shmobile/board-lager.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/arch/arm/mach-shmobile/board-lager.c
> b/arch/arm/mach-shmobile/board-lager.c index 6a1ba38..4d1b42b 100644
> --- a/arch/arm/mach-shmobile/board-lager.c
> +++ b/arch/arm/mach-shmobile/board-lager.c
> @@ -18,7 +18,10 @@
>   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 
> USA */
> 
> +#include <linux/gpio.h>
> +#include <linux/gpio_keys.h>
>  #include <linux/interrupt.h>
> +#include <linux/input.h>

My dictionary lists input before interrupt :-)

>  #include <linux/irqchip.h>
>  #include <linux/kernel.h>
>  #include <linux/leds.h>
> @@ -52,6 +55,22 @@ static struct gpio_led_platform_data lager_leds_pdata = {
> .num_leds	= ARRAY_SIZE(lager_leds),
>  };
> 
> +/* GPIO KEY */
> +#define GPIO_KEY(c, g, d, ...) \
> +	{ .code = c, .gpio = g, .desc = d, .active_low = 1 }
> +
> +static struct gpio_keys_button gpio_buttons[] = {
> +	GPIO_KEY(KEY_4,		RCAR_GP_PIN(1, 28),	"SW2-pin4"),
> +	GPIO_KEY(KEY_3,		RCAR_GP_PIN(1, 26),	"SW2-pin3"),
> +	GPIO_KEY(KEY_2,		RCAR_GP_PIN(1, 24),	"SW2-pin2"),
> +	GPIO_KEY(KEY_1,		RCAR_GP_PIN(1, 14),	"SW2-pin1"),
> +};
> +
> +static struct gpio_keys_platform_data lager_keys_pdata = {
> +	.buttons	= gpio_buttons,
> +	.nbuttons	= ARRAY_SIZE(gpio_buttons),
> +};
> +

Could you please also update the lager dts file ?

>  static const struct pinctrl_map lager_pinctrl_map[] = {
>  	/* SCIF0 (CN19: DEBUG SERIAL0) */
>  	PIN_MAP_MUX_GROUP_DEFAULT("sh-sci.6", "pfc-r8a7790",
> @@ -73,6 +92,9 @@ static void __init lager_add_standard_devices(void)
>  	platform_device_register_data(&platform_bus, "leds-gpio", -1,
>  				      &lager_leds_pdata,
>  				      sizeof(lager_leds_pdata));
> +	platform_device_register_data(&platform_bus, "gpio-keys", -1,
> +				      &lager_keys_pdata,
> +				      sizeof(lager_keys_pdata));
>  }
> 
>  static const char *lager_boards_compat_dt[] __initdata = {
-- 
Regards,

Laurent Pinchart