Fwd: [PATCH v5 5/6] drm/rockchip: dw_hdmi: store rockchip_hdmi reference in phy_data object

When using special phy handling operations we'll often need access to
the rockchip_hdmi struct.

As the chip-data that occupies the phy_data pointer initially gets
assigned to the rockchip_hdmi struct, we can now re-use this phy_data
pointer to hold the reference to the rockchip_hdmi struct and use this
reference later on.

Inspiration for this comes from meson and sunxi dw-hdmi, which are using
the same method.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Robin Murphy <robin.murphy@arm.com>

changes in v3:
- reword commit message
---
?drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 9 +++++++--
?1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c 

b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 57e76dfd5f6d..19f002fa0a09 100644

--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c

@@ -335,7 +335,7 @@ static int dw_hdmi_rockchip_bind(struct device 

*dev, struct device *master,
????????????????? void *data)
?{
???? struct platform_device *pdev = to_platform_device(dev);
-??? const struct dw_hdmi_plat_data *plat_data;
+??? struct dw_hdmi_plat_data *plat_data;
???? const struct of_device_id *match;
???? struct drm_device *drm = data;
???? struct drm_encoder *encoder;

@@ -350,9 +350,14 @@ static int dw_hdmi_rockchip_bind(struct device 

*dev, struct device *master,
???????? return -ENOMEM;
????? match = of_match_node(dw_hdmi_rockchip_dt_ids, pdev->dev.of_node);
-??? plat_data = match->data;
+??? plat_data = devm_kmemdup(&pdev->dev, match->data,
+???????????????????????? sizeof(*plat_data), GFP_KERNEL);
+??? if (!plat_data)
+??????? return -ENOMEM;
+
???? hdmi->dev = &pdev->dev;
???? hdmi->chip_data = plat_data->phy_data;
+??? plat_data->phy_data = hdmi;
???? encoder = &hdmi->encoder;
????? encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, 
dev->of_node);