[PATCH v1] drm/rockchip: analogix_dp: Apply devm_clk_get_optional() for &rockchip_dp_device.grfclk

[Damon Ding]

The "grf" clock is optional for Rockchip eDP controller(RK3399 needs
while RK3288 and RK3588 do not).

It can make the code more consice to use devm_clk_get_optional()
instead of devm_clk_get() with extra checks.

Signed-off-by: Damon Ding <damon.d...@rock-chips.com>
---
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c 
b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index d30f0983a53a..d0f78ab9faa6 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -335,12 +335,8 @@ static int rockchip_dp_of_probe(struct rockchip_dp_device 
*dp)
                return PTR_ERR(dp->grf);
        }
 
-       dp->grfclk = devm_clk_get(dev, "grf");
-       if (PTR_ERR(dp->grfclk) == -ENOENT) {
-               dp->grfclk = NULL;
-       } else if (PTR_ERR(dp->grfclk) == -EPROBE_DEFER) {
-               return -EPROBE_DEFER;
-       } else if (IS_ERR(dp->grfclk)) {
+       dp->grfclk = devm_clk_get_optional(dev, "grf");
+       if (IS_ERR(dp->grfclk)) {
                DRM_DEV_ERROR(dev, "failed to get grf clock\n");
                return PTR_ERR(dp->grfclk);
        }
-- 
2.34.1