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References: <1579675994-7001-1-git-send-email-light.hsieh@mediatek.com> <1579675994-7001-6-git-send-email-light.hsieh@mediatek.com>
In-Reply-To: <1579675994-7001-6-git-send-email-light.hsieh@mediatek.com>
From:   Sean Wang <sean.wang@kernel.org>
Date:   Wed, 22 Jan 2020 11:43:53 -0800
Message-ID: <CAGp9Lzox4EcO+WWEoLMshQDhH14644iTuAWA9XQc82JYfp-pqA@mail.gmail.com>
Subject: Re: [PATCH v8 6/6] pinctrl: mediatek: Add support for pin
 configuration dump via debugfs.
To:     Light Hsieh <light.hsieh@mediatek.com>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        lkml <linux-kernel@vger.kernel.org>, kuohong.wang@mediatek.com
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Sender: linux-kernel-owner@vger.kernel.org
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On Tue, Jan 21, 2020 at 10:53 PM <light.hsieh@mediatek.com> wrote:
>
> From: Light Hsieh <light.hsieh@mediatek.com>
>
> Add support for pin configuration dump via catting
> /sys/kernel/debug/pinctrl/$platform_dependent_path/pinconf-pins.
> pinctrl framework had already support such dump. This patch implement the
> operation function pointer to fullfill this dump.
>
> Signed-off-by: Light Hsieh <light.hsieh@mediatek.com>

Acked-by: Sean Wang <sean.wang@kernel.org>

> ---
>  drivers/pinctrl/mediatek/pinctrl-paris.c | 109 +++++++++++++++++++++++++++++++
>  drivers/pinctrl/mediatek/pinctrl-paris.h |   3 +
>  2 files changed, 112 insertions(+)
>
> diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
> index 115ebc1..83bf29c 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-paris.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
> @@ -539,12 +539,120 @@ static int mtk_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
>         return 0;
>  }
>
> +static int mtk_hw_get_value_wrap(struct mtk_pinctrl *hw, unsigned int gpio, int field)
> +{
> +       const struct mtk_pin_desc *desc;
> +       int value, err;
> +
> +       if (gpio > hw->soc->npins)
> +               return -EINVAL;
> +
> +       desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
> +
> +       err = mtk_hw_get_value(hw, desc, field, &value);
> +       if (err)
> +               return err;
> +
> +       return value;
> +}
> +
> +#define mtk_pctrl_get_pinmux(hw, gpio)                 \
> +       mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_MODE)
> +
> +#define mtk_pctrl_get_direction(hw, gpio)              \
> +       mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DIR)
> +
> +#define mtk_pctrl_get_out(hw, gpio)                    \
> +       mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DO)
> +
> +#define mtk_pctrl_get_in(hw, gpio)                     \
> +       mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DI)
> +
> +#define mtk_pctrl_get_smt(hw, gpio)                    \
> +       mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_SMT)
> +
> +#define mtk_pctrl_get_ies(hw, gpio)                    \
> +       mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_IES)
> +
> +#define mtk_pctrl_get_driving(hw, gpio)                        \
> +       mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DRV)
> +
> +ssize_t mtk_pctrl_show_one_pin(struct mtk_pinctrl *hw,
> +       unsigned int gpio, char *buf, unsigned int bufLen)
> +{
> +       int pinmux, pullup, pullen, len = 0, r1 = -1, r0 = -1;
> +       const struct mtk_pin_desc *desc;
> +
> +       if (gpio > hw->soc->npins)
> +               return -EINVAL;
> +
> +       desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
> +       pinmux = mtk_pctrl_get_pinmux(hw, gpio);
> +       if (pinmux >= hw->soc->nfuncs)
> +               pinmux -= hw->soc->nfuncs;
> +
> +       mtk_pinconf_bias_get_combo(hw, desc, &pullup, &pullen);
> +       if (pullen == MTK_PUPD_SET_R1R0_00) {
> +               pullen = 0;
> +               r1 = 0;
> +               r0 = 0;
> +       } else if (pullen == MTK_PUPD_SET_R1R0_01) {
> +               pullen = 1;
> +               r1 = 0;
> +               r0 = 1;
> +       } else if (pullen == MTK_PUPD_SET_R1R0_10) {
> +               pullen = 1;
> +               r1 = 1;
> +               r0 = 0;
> +       } else if (pullen == MTK_PUPD_SET_R1R0_11) {
> +               pullen = 1;
> +               r1 = 1;
> +               r0 = 1;
> +       } else if (pullen != MTK_DISABLE && pullen != MTK_ENABLE) {
> +               pullen = 0;
> +       }
> +       len += snprintf(buf + len, bufLen - len,
> +                       "%03d: %1d%1d%1d%1d%02d%1d%1d%1d%1d",
> +                       gpio,
> +                       pinmux,
> +                       mtk_pctrl_get_direction(hw, gpio),
> +                       mtk_pctrl_get_out(hw, gpio),
> +                       mtk_pctrl_get_in(hw, gpio),
> +                       mtk_pctrl_get_driving(hw, gpio),
> +                       mtk_pctrl_get_smt(hw, gpio),
> +                       mtk_pctrl_get_ies(hw, gpio),
> +                       pullen,
> +                       pullup);
> +
> +       if (r1 != -1) {
> +               len += snprintf(buf + len, bufLen - len, " (%1d %1d)\n",
> +                       r1, r0);
> +       } else {
> +               len += snprintf(buf + len, bufLen - len, "\n");
> +       }
> +
> +       return len;
> +}
> +
> +#define PIN_DBG_BUF_SZ 96
> +static void mtk_pctrl_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
> +                         unsigned int gpio)
> +{
> +       struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
> +       char buf[PIN_DBG_BUF_SZ];
> +
> +       (void)mtk_pctrl_show_one_pin(hw, gpio, buf, PIN_DBG_BUF_SZ);
> +
> +       seq_printf(s, "%s", buf);
> +}
> +
>  static const struct pinctrl_ops mtk_pctlops = {
>         .dt_node_to_map         = mtk_pctrl_dt_node_to_map,
>         .dt_free_map            = pinctrl_utils_free_map,
>         .get_groups_count       = mtk_pctrl_get_groups_count,
>         .get_group_name         = mtk_pctrl_get_group_name,
>         .get_group_pins         = mtk_pctrl_get_group_pins,
> +       .pin_dbg_show           = mtk_pctrl_dbg_show,
>  };
>
>  static int mtk_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
> @@ -641,6 +749,7 @@ static int mtk_pconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
>         .pin_config_get = mtk_pinconf_get,
>         .pin_config_group_get   = mtk_pconf_group_get,
>         .pin_config_group_set   = mtk_pconf_group_set,
> +       .is_generic = true,
>  };
>
>  static struct pinctrl_desc mtk_desc = {
> diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.h b/drivers/pinctrl/mediatek/pinctrl-paris.h
> index 3d43771..afb7650 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-paris.h
> +++ b/drivers/pinctrl/mediatek/pinctrl-paris.h
> @@ -60,6 +60,9 @@
>  int mtk_paris_pinctrl_probe(struct platform_device *pdev,
>                             const struct mtk_pin_soc *soc);
>
> +ssize_t mtk_pctrl_show_one_pin(struct mtk_pinctrl *hw,
> +       unsigned int gpio, char *buf, unsigned int bufLen);
> +
>  extern const struct dev_pm_ops mtk_paris_pinctrl_pm_ops;
>
>  #endif /* __PINCTRL_PARIS_H */
> --
> 1.8.1.1.dirty