From 84ff1c1a6d0a9ab3483d90fcc3a6101da2d16ae9 Mon Sep 17 00:00:00 2001
From: Jagan Teki <jagan@amarulasolutions.com>
Date: Sun, 22 Dec 2019 18:52:25 +0530
Subject: drm/sun4i: dsi: Get the mod clock for A31
Git-commit: 26a839b3c286060ff3a6d7b14194ae845ec5aa96
Patch-mainline: v5.6-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

As per the user manual, look like mod clock is not mandatory
for all Allwinner MIPI DSI controllers, it is connected to
CLK_DSI_SCLK for A31 and not available in A64.

So, add compatible check for A31 and get mod clock accordingly.

Tested-by: Merlijn Wajer <merlijn@wizzup.org>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20191222132229.30276-4-jagan@amarulasolutions.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 4e8f634cc2db..9bb3222c95b9 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -1120,10 +1120,13 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
 		return PTR_ERR(dsi->reset);
 	}
 
-	dsi->mod_clk = devm_clk_get(dev, "mod");
-	if (IS_ERR(dsi->mod_clk)) {
-		dev_err(dev, "Couldn't get the DSI mod clock\n");
-		return PTR_ERR(dsi->mod_clk);
+	if (of_device_is_compatible(dev->of_node,
+				    "allwinner,sun6i-a31-mipi-dsi")) {
+		dsi->mod_clk = devm_clk_get(dev, "mod");
+		if (IS_ERR(dsi->mod_clk)) {
+			dev_err(dev, "Couldn't get the DSI mod clock\n");
+			return PTR_ERR(dsi->mod_clk);
+		}
 	}
 
 	/*
-- 
2.28.0