[PATCH 4/8] video: stm32: ltdc: support new hardware version for STM32MP25 SoC
Raphael Gallais-Pou
raphael.gallais-pou at foss.st.com
Wed Aug 20 18:17:43 CEST 2025
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.
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou at foss.st.com>
---
drivers/video/stm32/stm32_ltdc.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/video/stm32/stm32_ltdc.c b/drivers/video/stm32/stm32_ltdc.c
index 0a062c8939dbe49b11aa50f5ca9701bdbe5c5b0b..d9ba5c4ef53558fe8b5565d47b022699d9e4ea0e 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 +704,7 @@ static int stm32_ltdc_bind(struct udevice *dev)
static const struct udevice_id stm32_ltdc_ids[] = {
{ .compatible = "st,stm32-ltdc" },
+ { .compatible = "st,stm32mp251-ltdc" },
{ }
};
--
2.25.1
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