linux-kernel - [PATCH v3 5/6] arm64: dts: st: add lvds support on stm32mp255

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Date: Mon, 15 Jan 2024 14:20:08 +0100
From: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
To: Yannick Fertre <yannick.fertre@...s.st.com>,
        Raphael Gallais-Pou
	<raphael.gallais-pou@...s.st.com>,
        Philippe Cornu
	<philippe.cornu@...s.st.com>,
        David Airlie <airlied@...il.com>, Daniel Vetter
	<daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC: <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 5/6] arm64: dts: st: add lvds support on stm32mp255

This patch adds LVDS support on stm32mp255.  The LVDS is used on
STM32MP2 as a display interface.  LVDS PLL clock is binded to the LTDC
input clock.

Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
---
Changes in v3:
	- Change the compatible to show SoC specificity

Changes in v2:
	- Move patch to stm32mp255.dtsi after internal discussions
---
 arch/arm64/boot/dts/st/stm32mp255.dtsi | 17 +++++++++++++++++
 drivers/gpu/drm/stm/lvds.c             |  2 +-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/st/stm32mp255.dtsi b/arch/arm64/boot/dts/st/stm32mp255.dtsi
index e6fa596211f5..68f60da32126 100644
--- a/arch/arm64/boot/dts/st/stm32mp255.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp255.dtsi
@@ -7,3 +7,20 @@
 
 / {
 };
+
+&ltdc {
+	clocks = <&rcc CK_BUS_LTDC>, <&rcc CK_KER_LTDC>, <&lvds 0>;
+	clock-names = "bus", "lcd", "lvds";
+};
+
+&rifsc {
+	lvds: lvds@...60000 {
+		#clock-cells = <0>;
+		compatible = "st,stm32mp25-lvds";
+		reg = <0x48060000 0x2000>;
+		clocks = <&rcc CK_BUS_LVDS>, <&rcc CK_KER_LVDSPHY>;
+		clock-names = "pclk", "ref";
+		resets = <&rcc LVDS_R>;
+		status = "disabled";
+	};
+};
diff --git a/drivers/gpu/drm/stm/lvds.c b/drivers/gpu/drm/stm/lvds.c
index beb8b7e437a0..5808db1a5cdf 100644
--- a/drivers/gpu/drm/stm/lvds.c
+++ b/drivers/gpu/drm/stm/lvds.c
@@ -1198,7 +1198,7 @@ static int lvds_remove(struct platform_device *pdev)
 
 static const struct of_device_id lvds_dt_ids[] = {
 	{
-		.compatible = "st,stm32-lvds",
+		.compatible = "st,stm32mp25-lvds",
 		.data = NULL
 	},
 	{ /* sentinel */ }
-- 
2.25.1