linux-kernel - [PATCH 5/8] drm/mediatek: dsi: add support for mipi26m clk

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Date:   Tue, 20 Oct 2020 19:42:50 +0200
From:   Fabien Parent <fparent@...libre.com>
To:     linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     matthias.bgg@...il.com, robh+dt@...nel.org, daniel@...ll.ch,
        airlied@...ux.ie, p.zabel@...gutronix.de, chunkuang.hu@...nel.org,
        Fabien Parent <fparent@...libre.com>
Subject: [PATCH 5/8] drm/mediatek: dsi: add support for mipi26m clk

MT8167 SoC needs an additional clock to be enabled. Add support for
the mipi26m clk.

Signed-off-by: Fabien Parent <fparent@...libre.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 461643c05689..08786734df8e 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -193,6 +193,7 @@ struct mtk_dsi {
 	struct clk *engine_clk;
 	struct clk *digital_clk;
 	struct clk *hs_clk;
+	struct clk *mipi26m;
 
 	u32 data_rate;
 
@@ -653,6 +654,12 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
 		goto err_disable_engine_clk;
 	}
 
+	ret = clk_prepare_enable(dsi->mipi26m);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable mipi26m clock: %d\n", ret);
+		goto err_phy_power_off;
+	}
+
 	mtk_dsi_enable(dsi);
 
 	if (dsi->driver_data->has_shadow_ctl)
@@ -710,6 +717,7 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
 
 	clk_disable_unprepare(dsi->engine_clk);
 	clk_disable_unprepare(dsi->digital_clk);
+	clk_disable_unprepare(dsi->mipi26m);
 
 	phy_power_off(dsi->phy);
 }
@@ -1086,6 +1094,8 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 		goto err_unregister_host;
 	}
 
+	dsi->mipi26m = devm_clk_get_optional(dev, "mipi26m");
+
 	dsi->hs_clk = devm_clk_get(dev, "hs");
 	if (IS_ERR(dsi->hs_clk)) {
 		ret = PTR_ERR(dsi->hs_clk);
-- 
2.28.0