linux-kernel - Re: [PATCH v2 2/4] pinctrl: rockchip: Don't call pinctrl_gpio_direction_output() in pin_config

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Message-ID: <1787271.XF3xqyK6yr@diego>
Date:	Thu, 23 Oct 2014 18:34:27 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Chris Zhong <zyw@...k-chips.com>,
	Sonny Rao <sonnyrao@...omium.org>,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] pinctrl: rockchip: Don't call pinctrl_gpio_direction_output() in pin_config_set()

Am Dienstag, 21. Oktober 2014, 10:47:33 schrieb Doug Anderson:
> The Rockchip pinctrl driver was calling
> rockchip_gpio_direction_output() in the pin_config_set() callback.
> This was just a shortcut for:
> * rockchip_gpio_set()
> * pinctrl_gpio_direction_output()
> 
> Unfortunately it's not so good to call pinctrl_gpio_direction_output()
> from pin_config_set().  Specifically when initting hogs you'll get an
> error.
> 
> Let's refactor a little so we can call
> _rockchip_pmx_gpio_set_direction() directly.
> 
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> Tested-by: Chris Zhong <zyw@...k-chips.com>

Reviewed-by: Heiko Stuebner <heiko@...ech.de>

> ---
> Changes in v2:
> - The 'flags' variable is now in the locking patch.
> - Fix confusion between 'pin' and 'offset'.
> 
>  drivers/pinctrl/pinctrl-rockchip.c | 41
> +++++++++++++++++++++++--------------- 1 file changed, 25 insertions(+), 16
> deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-rockchip.c
> b/drivers/pinctrl/pinctrl-rockchip.c index 230d8f3..8a3c582 100644
> --- a/drivers/pinctrl/pinctrl-rockchip.c
> +++ b/drivers/pinctrl/pinctrl-rockchip.c
> @@ -856,22 +856,14 @@ static int rockchip_pmx_set(struct pinctrl_dev
> *pctldev, unsigned selector, * leads to this function call (via the
> pinctrl_gpio_direction_{input|output}() * function called from the gpiolib
> interface).
>   */
> -static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
> -					      struct pinctrl_gpio_range *range,
> -					      unsigned offset, bool input)
> +static int _rockchip_pmx_gpio_set_direction(struct gpio_chip *chip,
> +					    int pin, bool input)
>  {
> -	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
>  	struct rockchip_pin_bank *bank;
> -	struct gpio_chip *chip;
> -	int pin, ret;
> +	int ret;
>  	u32 data;
> 
> -	chip = range->gc;
>  	bank = gc_to_pin_bank(chip);
> -	pin = offset - chip->base;
> -
> -	dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n",
> -		 offset, range->name, pin, input ? "input" : "output");
> 
>  	ret = rockchip_set_mux(bank, pin, RK_FUNC_GPIO);
>  	if (ret < 0)
> @@ -888,6 +880,23 @@ static int rockchip_pmx_gpio_set_direction(struct
> pinctrl_dev *pctldev, return 0;
>  }
> 
> +static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
> +					      struct pinctrl_gpio_range *range,
> +					      unsigned offset, bool input)
> +{
> +	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
> +	struct gpio_chip *chip;
> +	int pin;
> +
> +	chip = range->gc;
> +	pin = offset - chip->base;
> +	dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n",
> +		 offset, range->name, pin, input ? "input" : "output");
> +
> +	return _rockchip_pmx_gpio_set_direction(chip, offset - chip->base,
> +						input);
> +}
> +
>  static const struct pinmux_ops rockchip_pmx_ops = {
>  	.get_functions_count	= rockchip_pmx_get_funcs_count,
>  	.get_function_name	= rockchip_pmx_get_func_name,
> @@ -917,8 +926,7 @@ static bool rockchip_pinconf_pull_valid(struct
> rockchip_pin_ctrl *ctrl, return false;
>  }
> 
> -static int rockchip_gpio_direction_output(struct gpio_chip *gc,
> -					  unsigned offset, int value);
> +static void rockchip_gpio_set(struct gpio_chip *gc, unsigned offset, int
> value); static int rockchip_gpio_get(struct gpio_chip *gc, unsigned
> offset);
> 
>  /* set the pin config settings for a specified pin */
> @@ -959,9 +967,10 @@ static int rockchip_pinconf_set(struct pinctrl_dev
> *pctldev, unsigned int pin, return rc;
>  			break;
>  		case PIN_CONFIG_OUTPUT:
> -			rc = rockchip_gpio_direction_output(&bank->gpio_chip,
> -							    pin - bank->pin_base,
> -							    arg);
> +			rockchip_gpio_set(&bank->gpio_chip,
> +					  pin - bank->pin_base, arg);
> +			rc = _rockchip_pmx_gpio_set_direction(&bank->gpio_chip,
> +					  pin - bank->pin_base, false);
>  			if (rc)
>  				return rc;
>  			break;

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