[PATCH 3/7] pinctrl: imx1 core driver

[Sascha Hauer]

On Fri, Aug 02, 2013 at 12:38:23PM +0200, Markus Pargmann wrote:
> Signed-off-by: Markus Pargmann <mpa at pengutronix.de>
> ---
>  drivers/pinctrl/Kconfig             |   5 +
>  drivers/pinctrl/Makefile            |   1 +
>  drivers/pinctrl/pinctrl-imx1-core.c | 667 ++++++++++++++++++++++++++++++++++++
>  drivers/pinctrl/pinctrl-imx1.h      |  23 ++
>  4 files changed, 696 insertions(+)
>  create mode 100644 drivers/pinctrl/pinctrl-imx1-core.c
>  create mode 100644 drivers/pinctrl/pinctrl-imx1.h
> 
> +static int imx1_pinctrl_parse_groups(struct device_node *np,
> +				    struct imx_pin_group *grp,
> +				    struct imx_pinctrl_soc_info *info,
> +				    u32 index)
> +{
> +	int size;
> +	const __be32 *list;
> +	int i;
> +	u32 config;
> +
> +	dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
> +
> +	/* Initialise group */
> +	grp->name = np->name;
> +
> +	/*
> +	 * the binding format is fsl,pins = <PIN_FUNC_ID CONFIG ...>,
> +	 * do sanity check and calculate pins number
> +	 */
> +	list = of_get_property(np, "fsl,pins", &size);
> +	/* we do not check return since it's safe node passed down */
> +	if (!size || size % 12) {
> +		dev_notice(info->dev, "Not a valid fsl,pins property (%s)\n",
> +				np->name);
> +		return -EINVAL;
> +	}
> +
> +	grp->npins = size / 12;
> +	grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
> +				GFP_KERNEL);
> +	grp->mux_mode = devm_kzalloc(info->dev,
> +				grp->npins * sizeof(unsigned int), GFP_KERNEL);
> +	grp->configs = devm_kzalloc(info->dev,
> +				grp->npins * sizeof(unsigned long), GFP_KERNEL);

I know this is copied from the existing imx pinctrl driver, but normally
we check for allocation failures.

Also I find it very irritating that you allocate three arrays of
integers instead of a single array of a struct type. I know the pinctrl
framework forces you to pass an array of pin numbers (which is quite
horrible for drivers to handle, who came up with the idea that a pin is
a number instead of some struct pointer which can be attached data to?)


> +	for (i = 0; i < grp->npins; i++) {
> +		grp->pins[i] = be32_to_cpu(*list++);
> +		grp->mux_mode[i] = be32_to_cpu(*list++);
> +
> +		config = be32_to_cpu(*list++);
> +		grp->configs[i] = config;
> +	}
> +
> +	return 0;
> +}
> +

[...]

> +
> +	for_each_child_of_node(np, child) {
> +		func->groups[i] = child->name;
> +		grp = &info->groups[grp_index++];
> +		ret = imx1_pinctrl_parse_groups(child, grp, info, i++);
> +		if (ret)
> +			return ret;

This is one thing which nags me in the imx pinctrl driver aswell. Once
you made a single mistake in a single pinctrl group in the devicetree
you will never see the error message because the whole pinctrl driver
bails out leaving the serial driver with the console unusable. Wouldn't
it be possible to continue here instead of bailing out?

Sascha

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