linux-kernel - Re: [PATCH v3 2/3] drm/bridge: parade-ps8640: Use regmap APIs

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Date:   Tue, 14 Sep 2021 17:29:53 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        Philip Chen <philipchen@...omium.org>
Cc:     dianders@...omium.org, Andrzej Hajda <a.hajda@...sung.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v3 2/3] drm/bridge: parade-ps8640: Use regmap APIs

Quoting Philip Chen (2021-09-14 16:28:44)
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> index e340af381e05..8d3e7a147170 100644
> --- a/drivers/gpu/drm/bridge/parade-ps8640.c
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> @@ -368,6 +396,12 @@ static int ps8640_probe(struct i2c_client *client)
>
>         ps_bridge->page[PAGE0_DP_CNTL] = client;
>
> +       ps_bridge->regmap[PAGE0_DP_CNTL] = devm_regmap_init_i2c(client, ps8640_regmap_config);
> +       if (IS_ERR(ps_bridge->regmap[PAGE0_DP_CNTL])) {
> +               return dev_err_probe(dev, PTR_ERR(ps_bridge->regmap[PAGE0_DP_CNTL]),
> +                                    "Error initting page 0 regmap\n");

This one also doesn't return -EPROBE_DEFER? The dev_err_probe() should
really only be used on "get" style APIs that can defer.

> +       }
> +
>         for (i = 1; i < ARRAY_SIZE(ps_bridge->page); i++) {
>                 ps_bridge->page[i] = devm_i2c_new_dummy_device(&client->dev,
>                                                              client->adapter,