linux-kernel - Re: [PATCH 02/10] drm: bridge: it66121: Use devm_regulator_bulk_get

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Message-ID: <CAG3jFyu_9PLoHtE1qUcYuYGdt3RmuR-TmJHxVeTZfGLyvudxMA@mail.gmail.com>
Date:   Thu, 15 Dec 2022 11:57:14 +0100
From:   Robert Foss <robert.foss@...aro.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Phong LE <ple@...libre.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        list@...ndingux.net, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/10] drm: bridge: it66121: Use devm_regulator_bulk_get_enable()

On Wed, 14 Dec 2022 at 13:58, Paul Cercueil <paul@...pouillou.net> wrote:
>
> Simplify the code of the driver by using
> devm_regulator_bulk_get_enable(), which will handle powering up the
> regulators, and disabling them on probe error or module removal.
>
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  drivers/gpu/drm/bridge/ite-it66121.c | 34 +++++++---------------------
>  1 file changed, 8 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
> index 7476cfbf9585..a698eec8f250 100644
> --- a/drivers/gpu/drm/bridge/ite-it66121.c
> +++ b/drivers/gpu/drm/bridge/ite-it66121.c
> @@ -301,7 +301,6 @@ struct it66121_ctx {
>         struct device *dev;
>         struct gpio_desc *gpio_reset;
>         struct i2c_client *client;
> -       struct regulator_bulk_data supplies[3];
>         u32 bus_width;
>         struct mutex lock; /* Protects fields below and device registers */
>         struct hdmi_avi_infoframe hdmi_avi_infoframe;
> @@ -342,16 +341,6 @@ static void it66121_hw_reset(struct it66121_ctx *ctx)
>         gpiod_set_value(ctx->gpio_reset, 0);
>  }
>
> -static inline int ite66121_power_on(struct it66121_ctx *ctx)
> -{
> -       return regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> -}
> -
> -static inline int ite66121_power_off(struct it66121_ctx *ctx)
> -{
> -       return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> -}
> -
>  static inline int it66121_preamble_ddc(struct it66121_ctx *ctx)
>  {
>         return regmap_write(ctx->regmap, IT66121_MASTER_SEL_REG, IT66121_MASTER_SEL_HOST);
> @@ -1512,6 +1501,10 @@ static int it66121_audio_codec_init(struct it66121_ctx *ctx, struct device *dev)
>         return PTR_ERR_OR_ZERO(ctx->audio.pdev);
>  }
>
> +static const char * const it66121_supplies[] = {
> +       "vcn33", "vcn18", "vrf12"
> +};
> +
>  static int it66121_probe(struct i2c_client *client)
>  {
>         u32 revision_id, vendor_ids[2] = { 0 }, device_ids[2] = { 0 };
> @@ -1564,26 +1557,18 @@ static int it66121_probe(struct i2c_client *client)
>         i2c_set_clientdata(client, ctx);
>         mutex_init(&ctx->lock);
>
> -       ctx->supplies[0].supply = "vcn33";
> -       ctx->supplies[1].supply = "vcn18";
> -       ctx->supplies[2].supply = "vrf12";
> -       ret = devm_regulator_bulk_get(ctx->dev, 3, ctx->supplies);
> +       ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(it66121_supplies),
> +                                            it66121_supplies);
>         if (ret) {
> -               dev_err(ctx->dev, "regulator_bulk failed\n");
> +               dev_err(dev, "Failed to enable power supplies\n");
>                 return ret;
>         }
>
> -       ret = ite66121_power_on(ctx);
> -       if (ret)
> -               return ret;
> -
>         it66121_hw_reset(ctx);
>
>         ctx->regmap = devm_regmap_init_i2c(client, &it66121_regmap_config);
> -       if (IS_ERR(ctx->regmap)) {
> -               ite66121_power_off(ctx);
> +       if (IS_ERR(ctx->regmap))
>                 return PTR_ERR(ctx->regmap);
> -       }
>
>         regmap_read(ctx->regmap, IT66121_VENDOR_ID0_REG, &vendor_ids[0]);
>         regmap_read(ctx->regmap, IT66121_VENDOR_ID1_REG, &vendor_ids[1]);
> @@ -1596,7 +1581,6 @@ static int it66121_probe(struct i2c_client *client)
>
>         if (vendor_ids[0] != IT66121_VENDOR_ID0 || vendor_ids[1] != IT66121_VENDOR_ID1 ||
>             device_ids[0] != IT66121_DEVICE_ID0 || device_ids[1] != IT66121_DEVICE_ID1) {
> -               ite66121_power_off(ctx);
>                 return -ENODEV;
>         }
>
> @@ -1609,7 +1593,6 @@ static int it66121_probe(struct i2c_client *client)
>                                         IRQF_ONESHOT, dev_name(dev), ctx);
>         if (ret < 0) {
>                 dev_err(dev, "Failed to request irq %d:%d\n", client->irq, ret);
> -               ite66121_power_off(ctx);
>                 return ret;
>         }
>
> @@ -1626,7 +1609,6 @@ static void it66121_remove(struct i2c_client *client)
>  {
>         struct it66121_ctx *ctx = i2c_get_clientdata(client);
>
> -       ite66121_power_off(ctx);
>         drm_bridge_remove(&ctx->bridge);
>         mutex_destroy(&ctx->lock);
>  }
> --
> 2.35.1
>

Reviewed-by: Robert Foss <robert.foss@...aro.org>