drm/bridge: ti-sn65dsi86: Simplify refclk handling

The clock framework makes it simple to deal with an optional clock.
You can call clk_get_optional() and if the clock isn't specified it'll
just return NULL without complaint. It's valid to pass NULL to
enable/disable/prepare/unprepare. Let's make use of this to simplify
things a tiny bit.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210416153909.v4.2.Ic9c04f960190faad5290738b2a35d73661862735@changeid

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 88df4dd0f39d2dd04ddab55d2013645c982d7d2f..96fe8f2c0ea9c959d8ba6d3e81d929e9126054ef 100644 (file)
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -1275,14 +1275,9 @@ static int ti_sn_bridge_probe(struct i2c_client *client,
                return ret;
        }
 
-       pdata->refclk = devm_clk_get(pdata->dev, "refclk");
-       if (IS_ERR(pdata->refclk)) {
-               ret = PTR_ERR(pdata->refclk);
-               if (ret == -EPROBE_DEFER)
-                       return ret;
-               DRM_DEBUG_KMS("refclk not found\n");
-               pdata->refclk = NULL;
-       }
+       pdata->refclk = devm_clk_get_optional(pdata->dev, "refclk");
+       if (IS_ERR(pdata->refclk))
+               return PTR_ERR(pdata->refclk);
 
        ret = ti_sn_bridge_parse_dsi_host(pdata);
        if (ret)