linux-kernel - Re: [PATCH v3 03/14] pinctrl-ingenic: add a pinctrl driver for the Ingenic jz47xx SoCs

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Date:   Tue, 31 Jan 2017 15:05:43 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Maarten ter Huurne <maarten@...ewalker.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Paul Burton <paul.burton@...tec.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux MIPS <linux-mips@...ux-mips.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        James Hogan <james.hogan@...tec.com>
Subject: Re: [PATCH v3 03/14] pinctrl-ingenic: add a pinctrl driver for the
 Ingenic jz47xx SoCs

On Wed, Jan 25, 2017 at 7:51 PM, Paul Cercueil <paul@...pouillou.net> wrote:

> This driver handles pin configuration and pin muxing for the
> JZ4740 and JZ4780 SoCs from Ingenic.
>
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>

This is starting to look very nice.

> +#include <linux/compiler.h>
> +#include <linux/gpio.h>

Use <linux/gpio/driver.h> if it is a GPIO driver. I should
be enough ... I think.

> +static int ingenic_pinctrl_parse_dt_func(struct ingenic_pinctrl *jzpc,
> +               struct device_node *np)
> +{
> +       unsigned int num_groups;
> +       struct device_node *group_node;
> +       unsigned int i, j;
> +       int err, npins, *pins, *confs;
> +       const char **groups;
> +
> +       num_groups = of_get_child_count(np);
> +       groups = devm_kzalloc(jzpc->dev,
> +                       sizeof(*groups) * num_groups, GFP_KERNEL);
> +       if (!groups)
> +               return -ENOMEM;
> +
> +       i = 0;
> +       for_each_child_of_node(np, group_node) {
> +               groups[i++] = group_node->name;
> +
> +               npins = of_property_count_elems_of_size(group_node,
> +                               "ingenic,pins", 8);
> +               if (npins < 0)
> +                       return npins;
> +
> +               pins = devm_kzalloc(jzpc->dev,
> +                               sizeof(*pins) * npins, GFP_KERNEL);
> +               confs = devm_kzalloc(jzpc->dev,
> +                               sizeof(*confs) * npins, GFP_KERNEL);
> +               if (!pins || !confs)
> +                       return -ENOMEM;
> +
> +               for (j = 0; j < npins; j++) {
> +                       of_property_read_u32_index(group_node,
> +                                       "ingenic,pins", j * 2, &pins[j]);
> +
> +                       of_property_read_u32_index(group_node,
> +                                       "ingenic,pins", j * 2 + 1, &confs[j]);

If I didn't mention before this could pperhaps just use "pins"?

Or does these DT entries not match the generic bindings?

> +               }
> +
> +               err = pinctrl_generic_add_group(jzpc->pctl, group_node->name,
> +                               pins, npins, confs);
> +               if (err)
> +                       return err;
> +       }
> +
> +       return pinmux_generic_add_function(jzpc->pctl, np->name,
> +                       groups, num_groups, NULL);
> +}

If you just use "pins" can this even be parsed by a generic parser function
pinconf_generic_dt_subnode_to_map()?

Yours,
Linus Walleij