From: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Date: Thu, 4 Sep 2025 12:53:08 +0000 (+0200)
Subject: video: stm32: ltdc: support new hardware version for STM32MP25 SoC
X-Git-Tag: v2026.01-rc3~14^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b3316f6053feb3be1a731536c250942606447ea9;p=pandora-u-boot.git

video: stm32: ltdc: support new hardware version for STM32MP25 SoC

STM32MP2 SoCs feature a new version of the LTDC IP.  This new version
features a bus clock, as well as a 150MHz pad frequency.  Add its
compatible to the list of device to probe and handle quirks.  The new
hardware version features a bus clock.

Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Acked-by: Yannick Fertre <yannick.fertre@foss.st.com>
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
---

diff --git a/drivers/video/stm32/stm32_ltdc.c b/drivers/video/stm32/stm32_ltdc.c
index 0a062c8939d..efe9a00996e 100644
--- a/drivers/video/stm32/stm32_ltdc.c
+++ b/drivers/video/stm32/stm32_ltdc.c
@@ -262,6 +262,7 @@ static const u32 layer_regs_a2[] = {
 #define HWVER_10300 0x010300
 #define HWVER_20101 0x020101
 #define HWVER_40100 0x040100
+#define HWVER_40101 0x040101
 
 enum stm32_ltdc_pix_fmt {
 	PF_ARGB8888 = 0,	/* ARGB [32 bits] */
@@ -529,7 +530,7 @@ static int stm32_ltdc_probe(struct udevice *dev)
 	struct udevice *bridge = NULL;
 	struct udevice *panel = NULL;
 	struct display_timing timings;
-	struct clk pclk;
+	struct clk pclk, bclk;
 	struct reset_ctl rst;
 	ulong rate;
 	int ret;
@@ -540,7 +541,21 @@ static int stm32_ltdc_probe(struct udevice *dev)
 		return -EINVAL;
 	}
 
-	ret = clk_get_by_index(dev, 0, &pclk);
+	ret = clk_get_by_name(dev, "bus", &bclk);
+	if (ret) {
+		if (ret != -ENODATA) {
+			dev_err(dev, "bus clock get error %d\n", ret);
+			return ret;
+		}
+	} else {
+		ret = clk_enable(&bclk);
+		if (ret) {
+			dev_err(dev, "bus clock enable error %d\n", ret);
+			return ret;
+		}
+	}
+
+	ret = clk_get_by_name(dev, "lcd", &pclk);
 	if (ret) {
 		dev_err(dev, "peripheral clock get error %d\n", ret);
 		return ret;
@@ -566,6 +581,7 @@ static int stm32_ltdc_probe(struct udevice *dev)
 		priv->pix_fmt_hw = pix_fmt_a1;
 		break;
 	case HWVER_40100:
+	case HWVER_40101:
 		priv->layer_regs = layer_regs_a2;
 		priv->pix_fmt_hw = pix_fmt_a2;
 		break;
@@ -688,6 +704,8 @@ static int stm32_ltdc_bind(struct udevice *dev)
 
 static const struct udevice_id stm32_ltdc_ids[] = {
 	{ .compatible = "st,stm32-ltdc" },
+	{ .compatible = "st,stm32mp251-ltdc" },
+	{ .compatible = "st,stm32mp255-ltdc" },
 	{ }
 };