Subject: [PATCH 4/7] pinctrl: sh-pfc: Stop calling gpiochip_add_pin_range() on DT platforms

From: [email-masked] (Laurent Pinchart)
Date: Tue, 30 Jun 2015 12:30:55 +0300

Hi Geert,

Thank you for the patch.

On Tuesday 30 June 2015 09:45:24 Geert Uytterhoeven wrote:
> On platforms where the PFC/GPIO controller is instantiated from DT, the
> mapping between GPIOs and pins is set up using the "gpio-ranges"
> property in DT.
> 
> Hence stop setting up the mapping from C code on DT platforms.
> This code is still used for SH or ARM-legacy platforms.
> 
> Signed-off-by: Geert Uytterhoeven <[email-masked]>
> ---
>  drivers/pinctrl/sh-pfc/gpio.c | 36 ++++++++++++++++++++----------------
>  1 file changed, 20 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/pinctrl/sh-pfc/gpio.c b/drivers/pinctrl/sh-pfc/gpio.c
> index ba353735ecf2be9a..1be118e4865fd3f8 100644
> --- a/drivers/pinctrl/sh-pfc/gpio.c
> +++ b/drivers/pinctrl/sh-pfc/gpio.c
> @@ -379,22 +379,26 @@ int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
> 
>  	pfc->gpio = chip;
> 
> -	/* Register the GPIO to pin mappings. As pins with GPIO ports must come
> -	 * first in the ranges, skip the pins without GPIO ports by stopping at
> -	 * the first range that contains such a pin.
> -	 */
> -	for (i = 0; i < pfc->nr_ranges; ++i) {
> -		const struct sh_pfc_pin_range *range = &pfc->ranges[i];
> -
> -		if (range->start >= pfc->nr_gpio_pins)
> -			break;
> -
> -		ret = gpiochip_add_pin_range(&chip->gpio_chip,
> -					     dev_name(pfc->dev),
> -					     range->start, range->start,
> -					     range->end - range->start + 1);
> -		if (ret < 0)
> -			return ret;
> +	if (IS_ENABLED(CONFIG_SUPERH) ||
> +	    IS_ENABLED(CONFIG_ARCH_SHMOBILE_LEGACY)) {

I'd prefer checking IS_ENABLED(CONFIG_OF) && pfc->dev->of_node as that doesn't 
explicitly depend on the platform type.

As the code after this if block also don't need to run on non-DT platforms, 
how about just using

	if (IS_ENABLED(CONFIG_OF) && pfc->dev->of_node)
		return 0;

?

> +		/*
> +		 * Register the GPIO to pin mappings. As pins with GPIO ports
> +		 * must come first in the ranges, skip the pins without GPIO
> +		 * ports by stopping at the first range that contains such a
> +		 * pin.
> +		 */
> +		for (i = 0; i < pfc->nr_ranges; ++i) {
> +			const struct sh_pfc_pin_range *range = &pfc->ranges[i];
> +
> +			if (range->start >= pfc->nr_gpio_pins)
> +				break;
> +
> +			ret = gpiochip_add_pin_range(&chip->gpio_chip,
> +				dev_name(pfc->dev), range->start, range->start,
> +				range->end - range->start + 1);
> +			if (ret < 0)
> +				return ret;
> +		}
>  	}
> 
>  	/* Register the function GPIOs chip. */

-- 
Regards,

Laurent Pinchart