[PATCH 4/8] video: stm32: ltdc: support new hardware version for STM32MP25 SoC

[Raphael Gallais-Pou]

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-...@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