From 9b335357297dc3a9712a3a0f73f97db34317797b Mon Sep 17 00:00:00 2001
From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Date: Wed, 10 Feb 2021 12:10:15 +0100
Subject: drm/rockchip: dsi: add own additional pclk handling
Git-commit: c92ecb4eac76d323a793014b9bf9f39be491c606
Patch-mainline: v5.15-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

In a followup patch, we'll need to access the pclk ourself to enable some
functionality, so get and store it in the rockchip dw-dsi variant as well.

Clocks are refcounted, so possible cascading enablements are
no problem.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Tested-by: Sebastian Fricke <sebastian.fricke@posteo.net>
Acked-by: Helen Koike <helen.koike@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210210111020.2476369-2-heiko@sntech.de
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
index ec7729d18cb8..f3897de0c0b8 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c
@@ -223,6 +223,7 @@ struct dw_mipi_dsi_rockchip {
 	void __iomem *base;
 
 	struct regmap *grf_regmap;
+	struct clk *pclk;
 	struct clk *pllref_clk;
 	struct clk *grf_clk;
 	struct clk *phy_cfg_clk;
@@ -1065,6 +1066,13 @@ static int dw_mipi_dsi_rockchip_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	dsi->pclk = devm_clk_get(dev, "pclk");
+	if (IS_ERR(dsi->pclk)) {
+		ret = PTR_ERR(dsi->pclk);
+		DRM_DEV_ERROR(dev, "Unable to get pclk: %d\n", ret);
+		return ret;
+	}
+
 	dsi->pllref_clk = devm_clk_get(dev, "ref");
 	if (IS_ERR(dsi->pllref_clk)) {
 		if (dsi->phy) {
-- 
2.38.1