linux-kernel - [PATCH v2 1/6] drm/rockchip: dsi: add own additional pclk handling

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Message-Id: <20210210111020.2476369-2-heiko@sntech.de>
Date:   Wed, 10 Feb 2021 12:10:15 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     dri-devel@...ts.freedesktop.org
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        hjc@...k-chips.com, heiko@...ech.de, robh+dt@...nel.org,
        sebastian.fricke@...teo.net, linux-media@...r.kernel.org,
        dafna.hirschfeld@...labora.com, helen.koike@...labora.com,
        ezequiel@...labora.com, cmuellner@...ux.com,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>
Subject: [PATCH v2 1/6] drm/rockchip: dsi: add own additional pclk handling

From: Heiko Stuebner <heiko.stuebner@...obroma-systems.com>

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@...obroma-systems.com>
Tested-by: Sebastian Fricke <sebastian.fricke@...teo.net>
---
 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 24a71091759c..18e112e30f6e 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;
@@ -1051,6 +1052,13 @@ 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) {
-- 
2.29.2