linux-kernel - Re: [PATCH v3 04/10] pinctrl: actions: Add Actions S900 pinctrl driver

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Date:   Wed, 28 Feb 2018 20:36:53 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andreas Färber <afaerber@...e.de>,
        刘炜 <liuwei@...ions-semi.com>,
        mp-cs@...ions-semi.com, 96boards@...obotics.com,
        devicetree <devicetree@...r.kernel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        amit.kucheria@...aro.org,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        hzhang@...obotics.com, bdong@...obotics.com,
        manivannanece23@...il.com
Subject: Re: [PATCH v3 04/10] pinctrl: actions: Add Actions S900 pinctrl driver

On Wed, Feb 28, 2018 at 8:14 PM, Manivannan Sadhasivam
<manivannan.sadhasivam@...aro.org> wrote:
> Add pinctrl driver for Actions Semi S900 SoC. The driver supports
> pinctrl, pinmux and pinconf functionalities through a range of registers
> common to both gpio driver and pinctrl driver.
>
> Pinmux functionality is available only for the pin groups while the
> pinconf functionality is available for both pin groups and individual
> pins.

> +static int owl_set_mux(struct pinctrl_dev *pctrldev,
> +                               unsigned int function,
> +                               unsigned int group)
> +{

> +       mfpval = readl(pctrl->base + g->mfpctl_reg);
> +       mfpval &= ~mask;
> +       mfpval |= val;
> +       writel(mfpval, pctrl->base + g->mfpctl_reg);

This is called owl_update_bits().

> +static int owl_pin_config_set(struct pinctrl_dev *pctrldev,
> +                               unsigned int pin,
> +                               unsigned long *configs,
> +                               unsigned int num_configs)
> +{

> +       int ret = 0;

Redundant assignment?

> +               mask = (1 << width) - 1;
> +               mask = mask << bit;
> +               tmp = readl(pctrl->base + reg);
> +               tmp &= ~mask;
> +               tmp |= arg << bit;
> +               writel(tmp, pctrl->base + reg);

This is called owl_update_bits().

> +}

> +static int owl_group_pinconf_val2arg(const struct owl_pingroup *g,
> +                               unsigned int param,
> +                               u32 *arg)
> +{

> +       case PIN_CONFIG_SLEW_RATE:
> +               if (*arg)
> +                       *arg = 1;
> +               else
> +                       *arg = 0;

Doesn't slew rate allow a non-binary value?

> +       return 0;
> +}
> +
> +static int owl_group_config_get(struct pinctrl_dev *pctrldev,
> +                               unsigned int group,
> +                               unsigned long *config)
> +{
> +       int ret = 0;

Redundant assignment.

> +}

> +static int owl_group_config_set(struct pinctrl_dev *pctrldev,
> +                               unsigned int group,
> +                               unsigned long *configs,
> +                               unsigned int num_configs)
> +{
> +       int ret = 0;

Redundant assignment, see below.

> +               mask = (1 << width) - 1;
> +               mask = mask << bit;
> +               tmp = readl(pctrl->base + reg);
> +               tmp &= ~mask;
> +               tmp |= arg << bit;
> +               writel(tmp, pctrl->base + reg);

This is called owl_update_bits().

> +       return ret;

return 0; ?

> +}

> +int owl_pinctrl_probe(struct platform_device *pdev,
> +                               struct owl_pinctrl_soc_data *soc_data)
> +{

> +       clk_prepare_enable(pctrl->clk);

This can fail.

> +}

> +static const struct of_device_id s900_pinctrl_of_match[] = {
> +       { .compatible = "actions,s900-pinctrl", },

> +       { },

No comma needed.

> +};

-- 
With Best Regards,
Andy Shevchenko