Subject: [PATCHv3 3/6] pinctrl: gpio: vt8500: Add pincontrol driver for arch-vt8500

From: [email-masked] (Stephen Warren)
Date: Mon, 01 Apr 2013 11:06:00 -0600

On 03/28/2013 12:10 AM, Tony Prisk wrote:
> This patch adds support for the GPIO/pinmux controller found on the VIA
> VT8500 and Wondermedia WM8xxx-series SoCs.
> 
> Each pin within the controller is capable of operating as a GPIO or as
> an alternate function. The pins are numbered according to their control
> bank/bit so that if new pins are added, the existing numbering is maintained.
> 
> All currently supported SoCs are included: VT8500, WM8505, WM8650, WM8750 and
> WM8850.

> diff --git a/drivers/pinctrl/vt8500/pinctrl-wmt.c b/drivers/pinctrl/vt8500/pinctrl-wmt.c

> +static int wmt_pctl_dt_node_to_map_pull(struct wmt_pinctrl_data *data,
> +					struct device_node *np,
> +					u32 pin, u32 pull,
> +					struct pinctrl_map **maps)

> +	configs[0] = 0;

I assume that should be

	configs[0] = pull;

> +static int wmt_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
> +				   struct device_node *np,
> +				   struct pinctrl_map **map,
> +				   unsigned *num_maps)

> +fail:
> +	kfree(maps);
> +	return err;
> +}

There, I think you also want to iterate over maps[] and free
map->data.configs.config for any PIN_MAP_TYPE_CONFIGS_PIN.

Perhaps just call wmt_pctl_dt_free_map() here, with roughly nmaps =
cur_map - maps?

> +static int wmt_gpio_of_xlate(struct gpio_chip *gc,
> +				const struct of_phandle_args *gpiospec,
> +				u32 *flags)
> +{
> +	if (flags)
> +		*flags = gpiospec->args[1];
> +
> +	return gpiospec->args[0];
> +}

Can't you use of_gpio_simple_xlate(), and hence just not set .of_xlate in:

> +static struct gpio_chip wmt_gpio_chip = {
...
> +	.of_xlate = wmt_gpio_of_xlate,

Aside from that, this patch,

Reviewed-by: Stephen Warren <[email-masked]>

Although I didn't review pinctrl-*.c other than pinctrl-wmt.c, since
they're just big tables of data. Oh, except that the following could
probably be moved inside wmt_pinctrl_probe()?

> +	struct wmt_pinctrl_data *data;
> +	struct resource *res;
> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data) {
> +		dev_err(&pdev->dev, "failed to allocate data\n");
> +		return -ENOMEM;
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	data->base = devm_request_and_ioremap(&pdev->dev, res);
> +	if (!data->base) {
> +		dev_err(&pdev->dev, "failed to map memory resource\n");
> +		return -EBUSY;
> +	}