video: stm32: ltdc: add remove ops for RIF semaphores

When the driver is removed, we need to release the layers' RIF semaphores
so that the resources can be acquired by other entities, if needed.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Change-Id: Idd8862817c16b7b4590818671f01df112efa3923
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/u-boot/+/457633
Reviewed-by: Patrice CHOTARD <patrice.chotard@foss.st.com>
Reviewed-by: Gatien CHEVALLIER <gatien.chevallier@st.com>
Tested-by: Gatien CHEVALLIER <gatien.chevallier@st.com>
ACI: CITOOLS <MDG-smet-aci-reviews@list.st.com>
Domain-Review: Patrice CHOTARD <patrice.chotard@foss.st.com>
ACI: CIBUILD <MDG-smet-aci-builds@list.st.com>

Author: GseoC

drivers/video/stm32/stm32_ltdc.c

@@ -51,6 +51,8 @@ struct stm32_ltdc_priv {
 	u32 hw_version;
 	struct udevice *bridge;
 	struct udevice *panel;
+	struct ofnode_phandle_args args_cmn;
+	struct ofnode_phandle_args args_l1l2;
 };
 
 /* Layer register offsets */
@@ -824,9 +826,6 @@ static int stm32_ltdc_probe(struct udevice *dev)
 
 	if (IS_ENABLED(CONFIG_STM32MP25X) || IS_ENABLED(CONFIG_STM32MP23X) ||
 	    IS_ENABLED(CONFIG_STM32MP21X)) {
-		struct ofnode_phandle_args args_cmn;
-		struct ofnode_phandle_args args_l1l2;
-
 		node = dev_ofnode(dev);
 
 		idx = ofnode_stringlist_search(node, "access-controller-names", "cmn");
@@ -835,7 +834,7 @@ static int stm32_ltdc_probe(struct udevice *dev)
 
 		ret = ofnode_parse_phandle_with_args(node, "access-controllers",
 						     "#access-controller-cells",
-						     0, idx, &args_cmn);
+						     0, idx, &priv->args_cmn);
 		if (ret < 0) {
 			dev_err(dev, "Can not get access-controllers to common registers\n");
 			return ret;
@@ -855,7 +854,7 @@ static int stm32_ltdc_probe(struct udevice *dev)
 
 		ret = ofnode_parse_phandle_with_args(node, "access-controllers",
 						     "#access-controller-cells",
-						     0, idx, &args_l1l2);
+						     0, idx, &priv->args_l1l2);
 		if (ret < 0) {
 			dev_err(dev, "Can not get access-controllers to l1l2 registers\n");
 			return ret;
@@ -1118,5 +1117,7 @@ U_BOOT_DRIVER(stm32_ltdc) = {
 	.of_match		= stm32_ltdc_ids,
 	.probe			= stm32_ltdc_probe,
 	.bind			= stm32_ltdc_bind,
-	.priv_auto	= sizeof(struct stm32_ltdc_priv),
+	.priv_auto		= sizeof(struct stm32_ltdc_priv),
+	.flags			= DM_FLAG_OS_PREPARE,
+	.remove			= stm32_ltdc_remove,
 };