linux-kernel - Re: [PATCH 1/6] mfd: arizona: Factor out read of device tree GPIOs

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Date:	Tue, 15 Apr 2014 11:25:27 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	broonie@...nel.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, rob@...dley.net, sameo@...ux.intel.com,
	lgirdwood@...il.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] mfd: arizona: Factor out read of device tree GPIOs

On Tue, 01 Apr 2014, Charles Keepax wrote:

> This patch factors out the reading of GPIOs for the Arizona devices
> into a helper function.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>  drivers/mfd/arizona-core.c       |   33 ++++++++++++++++++++++++---------
>  include/linux/mfd/arizona/core.h |    3 +++
>  2 files changed, 27 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index a45aab9..8ad4373 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -512,19 +512,34 @@ int arizona_of_get_type(struct device *dev)
>  }
>  EXPORT_SYMBOL_GPL(arizona_of_get_type);
>  
> +int arizona_of_get_named_gpio(struct arizona *arizona, const char *prop,
> +			      bool mandatory, int *gpio)
> +{
> +	int ret;
> +
> +	ret = of_get_named_gpio(arizona->dev->of_node, prop, 0);
> +	*gpio = ret;
> +	if (ret >= 0)
> +		return ret;
> +
> +	*gpio = 0;
> +
> +	if (mandatory)
> +		dev_err(arizona->dev,
> +			"Mandatory DT gpio %s missing/malformed: %d\n",
> +			prop, ret);
> +
> +	return ret;
> +}

Hmm.. me no likey!

How about:

+void arizona_of_get_named_gpio(struct arizona *arizona, const char *prop,
+				bool mandatory, int *gpio)
+{
+	*gpio = of_get_named_gpio(arizona->dev->of_node, prop, 0);
+	if (*gpio < 0) {
+	 	if (mandatory)
+			dev_err(arizona->dev,
+				"Mandatory DT gpio %s missing/malformed: %d\n",
+				prop, *gpio);
+		*gpio = 0;
+	}
+}

> +EXPORT_SYMBOL_GPL(arizona_of_get_named_gpio);
> +

Are you sure you're going to use this externally?

NB: I haven't looked at the remainder of the set yet.

>  static int arizona_of_get_core_pdata(struct arizona *arizona)
>  {
> +	struct arizona_pdata *pdata = &arizona->pdata;
>  	int ret, i;
>  
> -	arizona->pdata.reset = of_get_named_gpio(arizona->dev->of_node,
> -						 "wlf,reset", 0);
> -	if (arizona->pdata.reset < 0)
> -		arizona->pdata.reset = 0;
> -
> -	arizona->pdata.ldoena = of_get_named_gpio(arizona->dev->of_node,
> -						  "wlf,ldoena", 0);
> -	if (arizona->pdata.ldoena < 0)
> -		arizona->pdata.ldoena = 0;
> +	arizona_of_get_named_gpio(arizona, "wlf,reset", true, &pdata->reset);
> +	arizona_of_get_named_gpio(arizona, "wlf,ldoena", true, &pdata->ldoena);

I guess this pdata is populated by DT?

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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