drm/rockchip: dsi: add px30 support

Add the compatible and GRF definitions for the PX30 soc.

changes in v5:
- rebased on top of 5.5-rc1
- merged with dsi timing change to prevent ordering conflicts
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191209143130.4553-7-heiko@sntech.de

drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c

@@ -140,6 +140,12 @@
 #define DW_MIPI_NEEDS_PHY_CFG_CLK	BIT(0)
 #define DW_MIPI_NEEDS_GRF_CLK		BIT(1)
 
+#define PX30_GRF_PD_VO_CON1		0x0438
+#define PX30_DSI_FORCETXSTOPMODE	(0xf << 7)
+#define PX30_DSI_FORCERXMODE		BIT(6)
+#define PX30_DSI_TURNDISABLE		BIT(5)
+#define PX30_DSI_LCDC_SEL		BIT(0)
+
 #define RK3288_GRF_SOC_CON6		0x025c
 #define RK3288_DSI0_LCDC_SEL		BIT(6)
 #define RK3288_DSI1_LCDC_SEL		BIT(9)
@@ -1127,6 +1133,24 @@ static int dw_mipi_dsi_rockchip_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct rockchip_dw_dsi_chip_data px30_chip_data[] = {
+	{
+		.reg = 0xff450000,
+		.lcdsel_grf_reg = PX30_GRF_PD_VO_CON1,
+		.lcdsel_big = HIWORD_UPDATE(0, PX30_DSI_LCDC_SEL),
+		.lcdsel_lit = HIWORD_UPDATE(PX30_DSI_LCDC_SEL,
+					    PX30_DSI_LCDC_SEL),
+
+		.lanecfg1_grf_reg = PX30_GRF_PD_VO_CON1,
+		.lanecfg1 = HIWORD_UPDATE(0, PX30_DSI_TURNDISABLE |
+					     PX30_DSI_FORCERXMODE |
+					     PX30_DSI_FORCETXSTOPMODE),
+
+		.max_data_lanes = 4,
+	},
+	{ /* sentinel */ }
+};
+
 static const struct rockchip_dw_dsi_chip_data rk3288_chip_data[] = {
 	{
 		.reg = 0xff960000,
@@ -1195,6 +1219,9 @@ static const struct rockchip_dw_dsi_chip_data rk3399_chip_data[] = {
 
 static const struct of_device_id dw_mipi_dsi_rockchip_dt_ids[] = {
 	{
+	 .compatible = "rockchip,px30-mipi-dsi",
+	 .data = &px30_chip_data,
+	}, {
 	 .compatible = "rockchip,rk3288-mipi-dsi",
 	 .data = &rk3288_chip_data,
 	}, {