Subject: [PATCH 3/7] sh: pfc: Allow device tree registration

From: [email-masked] (Laurent Pinchart)
Date: Mon, 26 Nov 2012 13:54:47 +0100

Hi Simon,

On Monday 26 November 2012 09:16:50 Simon Horman wrote:
> This is a crude mechanism to allow the pfc driver to be registered through
> device tree. The mofication of this is to provide a way for pfc gpios to be
> looked up by device tree for devices which use pfc gpios.

Indeed it's a bit of a hack :-) I'll see how I can rebase that on top of my 
PFC patch series. I'd rather avoid this intermediate step as it would make PFC 
rework more complex.

> More specifically, the motivation is to allow the registration
> of the card-detect gpio for the Micro-SD SDHI slot of the KZM9G board.
>
> Cc: Paul Mundt <[email-masked]>
> Cc: Laurent Pinchart <[email-masked]>
> Signed-off-by: Simon Horman <[email-masked]>
> ---
>  drivers/sh/pfc/gpio.c  |   15 +++++++++++++++
>  include/linux/sh_pfc.h |    7 +++++++
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/sh/pfc/gpio.c b/drivers/sh/pfc/gpio.c
> index 038fa07..322b927 100644
> --- a/drivers/sh/pfc/gpio.c
> +++ b/drivers/sh/pfc/gpio.c
> @@ -136,6 +136,19 @@ static void sh_pfc_gpio_setup(struct sh_pfc_chip *chip)
> gc->ngpio = (pfc->last_gpio - pfc->first_gpio) + 1;
>  }
> 
> +#ifdef CONFIG_OF_GPIO
> +static void
> +sh_pfc_register_gpiochip_dt(struct sh_pfc *pfc, struct gpio_chip *chip)
> +{
> +	chip->of_node = pfc->of_node;
> +	chip->of_gpio_n_cells = pfc->of_gpio_n_cells;
> +	chip->of_xlate = pfc->of_xlate;
> +}
> +#else
> +static void sh_pfc_register_gpiochip_dt(struct sh_pfc *pfc,
> +					struct gpio_chip *chip) {}
> +#endif
> +
>  int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
>  {
>  	struct sh_pfc_chip *chip;
> @@ -153,6 +166,8 @@ int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
>  	if (unlikely(ret < 0))
>  		kfree(chip);
> 
> +	sh_pfc_register_gpiochip_dt(pfc, &chip->gpio_chip);
> +
>  	pr_info("%s handling gpio %d -> %d\n",
>  		pfc->name, pfc->first_gpio, pfc->last_gpio);
> 
> diff --git a/include/linux/sh_pfc.h b/include/linux/sh_pfc.h
> index c19a092..9963370 100644
> --- a/include/linux/sh_pfc.h
> +++ b/include/linux/sh_pfc.h
> @@ -124,6 +124,13 @@ struct sh_pfc {
>  	struct pfc_window *window;
> 
>  	unsigned long unlock_reg;
> +
> +#ifdef CONFIG_OF_GPIO
> +	struct device_node *of_node;
> +	int of_gpio_n_cells;
> +	int (*of_xlate)(struct gpio_chip *gc,
> +		        const struct of_phandle_args *gpiospec, u32 *flags);
> +#endif
>  };
> 
>  /* XXX compat for now */
-- 
Regards,

Laurent Pinchart