drm/rockchip: dw_hdmi: allow including external phys

Some variants of the dw-hdmi on Rockchip socs use a separate phy block
accessed via the generic phy framework, so allow them to be included
if such a phy reference is found.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Zheng Yang <zhengyang@rock-chips.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180912124740.20343-5-heiko@sntech.de

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index b09c3531305bccaa84b85722199ad94aea3e99c9..57e76dfd5f6d694ecd728decb696237cdc6907b0 100644 (file)
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -11,6 +11,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/phy/phy.h>
 #include <linux/regmap.h>
 
 #include <drm/drm_of.h>
@@ -49,6 +50,7 @@ struct rockchip_hdmi {
        struct clk *vpll_clk;
        struct clk *grf_clk;
        struct dw_hdmi *hdmi;
+       struct phy *phy;
 };
 
 #define to_rockchip_hdmi(x)    container_of(x, struct rockchip_hdmi, x)
@@ -376,6 +378,14 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
                return ret;
        }
 
+       hdmi->phy = devm_phy_optional_get(dev, "hdmi");
+       if (IS_ERR(hdmi->phy)) {
+               ret = PTR_ERR(hdmi->phy);
+               if (ret != -EPROBE_DEFER)
+                       DRM_DEV_ERROR(hdmi->dev, "failed to get phy\n");
+               return ret;
+       }
+
        drm_encoder_helper_add(encoder, &dw_hdmi_rockchip_encoder_helper_funcs);
        drm_encoder_init(drm, encoder, &dw_hdmi_rockchip_encoder_funcs,
                         DRM_MODE_ENCODER_TMDS, NULL);