linux-kernel - Re: [PATCH] mmc: sdhci-of-arasan: Add pinctrl support to the driver

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Message-ID: <CAPDyKFr7KTf7jUAuPj=0NZ1sty+y7ySV8PkdrKFXPVthJ=VJVQ@mail.gmail.com>
Date:   Wed, 18 Nov 2020 16:43:35 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Manish Narani <manish.narani@...inx.com>
Cc:     Michal Simek <michal.simek@...inx.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        git@...inx.com
Subject: Re: [PATCH] mmc: sdhci-of-arasan: Add pinctrl support to the driver

On Wed, 18 Nov 2020 at 07:22, Manish Narani <manish.narani@...inx.com> wrote:
>
> Driver should be able to handle optional pinctrl setting.
>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
> ---
>  drivers/mmc/host/sdhci-of-arasan.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index 829ccef87426..f788cc9d5914 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -23,6 +23,7 @@
>  #include <linux/regmap.h>
>  #include <linux/of.h>
>  #include <linux/firmware/xlnx-zynqmp.h>
> +#include <linux/pinctrl/consumer.h>
>
>  #include "cqhci.h"
>  #include "sdhci-pltfm.h"
> @@ -135,6 +136,8 @@ struct sdhci_arasan_clk_data {
>   * @clk_ops:           Struct for the Arasan Controller Clock Operations.
>   * @soc_ctl_base:      Pointer to regmap for syscon for soc_ctl registers.
>   * @soc_ctl_map:       Map to get offsets into soc_ctl registers.
> + * @pinctrl:           Per-device pin control state holder.
> + * @pins_default:      Pinctrl state for a device.
>   * @quirks:            Arasan deviations from spec.
>   */
>  struct sdhci_arasan_data {
> @@ -149,6 +152,8 @@ struct sdhci_arasan_data {
>
>         struct regmap   *soc_ctl_base;
>         const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
> +       struct pinctrl  *pinctrl;
> +       struct pinctrl_state *pins_default;
>         unsigned int    quirks;
>
>  /* Controller does not have CD wired and will not function normally without */
> @@ -1619,6 +1624,25 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>                 goto unreg_clk;
>         }
>
> +       sdhci_arasan->pinctrl = devm_pinctrl_get(&pdev->dev);
> +       if (!IS_ERR(sdhci_arasan->pinctrl)) {
> +               sdhci_arasan->pins_default =
> +                       pinctrl_lookup_state(sdhci_arasan->pinctrl,
> +                                            PINCTRL_STATE_DEFAULT);
> +               if (IS_ERR(sdhci_arasan->pins_default)) {
> +                       dev_err(&pdev->dev, "Missing default pinctrl config\n");
> +                       ret = PTR_ERR(sdhci_arasan->pins_default);
> +                       goto unreg_clk;
> +               }
> +
> +               ret = pinctrl_select_state(sdhci_arasan->pinctrl,
> +                                          sdhci_arasan->pins_default);
> +               if (ret) {
> +                       dev_err(&pdev->dev, "could not select default state\n");
> +                       goto unreg_clk;
> +               }
> +       }

Isn't all this already taken care of via pinctrl_bind_pins() called by
driver core during probe?

[...]

Kind regards
Uffe