linux-kernel - Re: [PATCH] gpio: em: Add pinctrl support

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Date:	Wed, 03 Jul 2013 20:59:39 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	linux-sh@...r.kernel.org, linus.walleij@...aro.org,
	linux-kernel@...r.kernel.org, horms@...ge.net.au,
	grant.likely@...aro.org
Subject: Re: [PATCH] gpio: em: Add pinctrl support

Hi Magnus,

Thank you for the patch.

On Wednesday 03 July 2013 13:14:32 Magnus Damm wrote:
> From: Magnus Damm <damm@...nsource.se>
> 
> Register the GPIO pin range, and request and free GPIO pins using the
> pinctrl API. The pctl_name platform data member should be used by
> platform devices to point out which pinctrl device to use.
> 
> Follows same style as "dc3465a gpio-rcar: Add pinctrl support",
> by Laurent Pinchart, thanks to him.
> 
> Signed-off-by: Magnus Damm <damm@...nsource.se>

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Linus, now that the v3.12 development cycle will begin, would you like to take 
the patch through your tree ? If so, how should we handle cross-dependencies 
between the pinctrl/gpio tree and the Renesas ARM tree ?

> ---
> 
>  drivers/gpio/gpio-em.c                |   25 +++++++++++++++++++++++++
>  include/linux/platform_data/gpio-em.h |    1 +
>  2 files changed, 26 insertions(+)
> 
> --- 0001/drivers/gpio/gpio-em.c
> +++ work/drivers/gpio/gpio-em.c	2013-07-03 12:49:55.000000000 +0900
> @@ -30,6 +30,7 @@
>  #include <linux/gpio.h>
>  #include <linux/slab.h>
>  #include <linux/module.h>
> +#include <linux/pinctrl/consumer.h>
>  #include <linux/platform_data/gpio-em.h>
> 
>  struct em_gio_priv {
> @@ -216,6 +217,21 @@ static int em_gio_to_irq(struct gpio_chi
>  	return irq_create_mapping(gpio_to_priv(chip)->irq_domain, offset);
>  }
> 
> +static int em_gio_request(struct gpio_chip *chip, unsigned offset)
> +{
> +	return pinctrl_request_gpio(chip->base + offset);
> +}
> +
> +static void em_gio_free(struct gpio_chip *chip, unsigned offset)
> +{
> +	pinctrl_free_gpio(chip->base + offset);
> +
> +	/* Set the GPIO as an input to ensure that the next GPIO request won't
> +	* drive the GPIO pin as an output.
> +	*/
> +	em_gio_direction_input(chip, offset);
> +}
> +
>  static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int virq,
>  				 irq_hw_number_t hw)
>  {
> @@ -308,6 +324,8 @@ static int em_gio_probe(struct platform_
>  	gpio_chip->direction_output = em_gio_direction_output;
>  	gpio_chip->set = em_gio_set;
>  	gpio_chip->to_irq = em_gio_to_irq;
> +	gpio_chip->request = em_gio_request;
> +	gpio_chip->free = em_gio_free;
>  	gpio_chip->label = name;
>  	gpio_chip->owner = THIS_MODULE;
>  	gpio_chip->base = pdata->gpio_base;
> @@ -351,6 +369,13 @@ static int em_gio_probe(struct platform_
>  		dev_err(&pdev->dev, "failed to add GPIO controller\n");
>  		goto err1;
>  	}
> +
> +	if (pdata->pctl_name) {
> +		ret = gpiochip_add_pin_range(gpio_chip, pdata->pctl_name, 0,
> +					     gpio_chip->base, gpio_chip->ngpio);
> +		if (ret < 0)
> +			dev_warn(&pdev->dev, "failed to add pin range\n");
> +	}
>  	return 0;
> 
>  err1:
> --- 0001/include/linux/platform_data/gpio-em.h
> +++ work/include/linux/platform_data/gpio-em.h	2013-07-03 
12:45:27.000000000
> +0900 @@ -5,6 +5,7 @@ struct gpio_em_config {
>  	unsigned int gpio_base;
>  	unsigned int irq_base;
>  	unsigned int number_of_pins;
> +	const char *pctl_name;
>  };
> 
>  #endif /* __GPIO_EM_H__ */
-- 
Regards,

Laurent Pinchart

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