linux-kernel - Re: [PATCH] mmc: host: dw_mmc-exynos: Add support for pinctrl

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Date:	Mon, 31 Dec 2012 11:59:54 +0900
From:	Dongjin Kim <tobetter@...il.com>
To:	Dongjin Kim <tobetter@...il.com>
Cc:	Chris Ball <cjb@...top.org>, Arnd Bergmann <arnd@...db.de>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Will Newton <will.newton@...tec.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: host: dw_mmc-exynos: Add support for pinctrl

Hi,

Does anyone have advice on this patch?

On Sat, Dec 22, 2012 at 2:11 AM, Dongjin Kim <tobetter@...il.com> wrote:
> This patch adds support for pin configuration using pinctrl subsystem to
> dw_mmc-exynos driver. The property 'wp-gpios' can be specified for write
> protect but 'samsung,cd-pinmux-gpio' and gpios used for clock, command and
> data lines will be ignored.
>
> -. 'pinctrl-0' should specify pin control groups (clock, comand and data
>     lines) used for this controller.
> -. 'pinctrl-names' should contain only one value, 'default'.
>
> Signed-off-by: Dongjin Kim <tobetter@...il.com>
> ---
>  drivers/mmc/host/dw_mmc-exynos.c |   44
> ++++++++++++++++++++++++--------------
>  1 file changed, 28 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc-exynos.c
> b/drivers/mmc/host/dw_mmc-exynos.c
> index 4d50da6..d1c9963 100644
> --- a/drivers/mmc/host/dw_mmc-exynos.c
> +++ b/drivers/mmc/host/dw_mmc-exynos.c
> @@ -16,6 +16,7 @@
>  #include <linux/mmc/dw_mmc.h>
>  #include <linux/of.h>
>  #include <linux/of_gpio.h>
> +#include <linux/pinctrl/consumer.h>
>
>  #include "dw_mmc.h"
>  #include "dw_mmc-pltfm.h"
> @@ -49,6 +50,7 @@ struct dw_mci_exynos_priv_data {
>         u8                              ciu_div;
>         u32                             sdr_timing;
>         u32                             ddr_timing;
> +       struct pinctrl                  *pctrl;
>  };
>
>  static struct dw_mci_exynos_compatible {
> @@ -84,6 +86,10 @@ static int dw_mci_exynos_priv_init(struct dw_mci *host)
>                         priv->ctrl_type = exynos_compat[idx].ctrl_type;
>         }
>
> +       priv->pctrl = devm_pinctrl_get_select_default(host->dev);
> +       if (IS_ERR(priv->pctrl))
> +               dev_dbg(host->dev, "no pinctrl node\n");
> +
>         host->priv = priv;
>         return 0;
>  }
> @@ -149,32 +155,19 @@ static int dw_mci_exynos_parse_dt(struct dw_mci
> *host)
>                 return ret;
>
>         priv->ddr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
> +
>         return 0;
>  }
>
>  static int dw_mci_exynos_setup_bus(struct dw_mci *host,
>                                 struct device_node *slot_np, u8 bus_width)
>  {
> +       struct dw_mci_exynos_priv_data *priv = host->priv;
>         int idx, gpio, ret;
>
>         if (!slot_np)
>                 return -EINVAL;
>
> -       /* cmd + clock + bus-width pins */
> -       for (idx = 0; idx < NUM_PINS(bus_width); idx++) {
> -               gpio = of_get_gpio(slot_np, idx);
> -               if (!gpio_is_valid(gpio)) {
> -                       dev_err(host->dev, "invalid gpio: %d\n", gpio);
> -                       return -EINVAL;
> -               }
> -
> -               ret = devm_gpio_request(host->dev, gpio, "dw-mci-bus");
> -               if (ret) {
> -                       dev_err(host->dev, "gpio [%d] request failed\n",
> gpio);
> -                       return -EBUSY;
> -               }
> -       }
> -
>         gpio = of_get_named_gpio(slot_np, "wp-gpios", 0);
>         if (gpio_is_valid(gpio)) {
>                 if (devm_gpio_request(host->dev, gpio, "dw-mci-wp"))
> @@ -185,9 +178,12 @@ static int dw_mci_exynos_setup_bus(struct dw_mci
> *host,
>                 host->pdata->quirks |= DW_MCI_QUIRK_NO_WRITE_PROTECT;
>         }
>
> -       if (host->pdata->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
> +       if (!IS_ERR(priv->pctrl))
>                 return 0;
>
> +       if (host->pdata->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
> +               goto setup_bus;
> +
>         gpio = of_get_named_gpio(slot_np, "samsung,cd-pinmux-gpio", 0);
>         if (gpio_is_valid(gpio)) {
>                 if (devm_gpio_request(host->dev, gpio, "dw-mci-cd"))
> @@ -196,6 +192,22 @@ static int dw_mci_exynos_setup_bus(struct dw_mci
> *host,
>                 dev_info(host->dev, "cd gpio not available");
>         }
>
> + setup_bus:
> +       /* cmd + clock + bus-width pins */
> +       for (idx = 0; idx < NUM_PINS(bus_width); idx++) {
> +               gpio = of_get_gpio(slot_np, idx);
> +               if (!gpio_is_valid(gpio)) {
> +                       dev_err(host->dev, "invalid gpio: %d\n", gpio);
> +                       return -EINVAL;
> +               }
> +
> +               ret = devm_gpio_request(host->dev, gpio, "dw-mci-bus");
> +               if (ret) {
> +                       dev_err(host->dev, "gpio [%d] request failed\n",
> gpio);
> +                       return -EBUSY;
> +               }
> +       }
> +
>         return 0;
>  }
>
> --
> 1.7.9.5
>
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