[PATCH 7/7] board: stm32mp1: enable simple framebuffer node for splashscreen

[Patrick Delaunay]

Enable an existing simple framebuffer node in the Linux kernel device
tree and the add the associated reserved memory node to preserved the
resources (clock, memory) used by the stm32 video driver to display
the splashscreen = background in exlinux.conf file.

These resources will be released by the Linux driver only when the
associated driver is ready to avoid transition issues during the Linux
kernel initialization between U-Boot splash screen and the final display.

See Linux documentation for details:
Documentation/devicetree/bindings/display/simple-framebuffer.yaml

Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
---

 board/st/stm32mp1/stm32mp1.c        | 4 ++++
 configs/stm32mp15_basic_defconfig   | 1 +
 configs/stm32mp15_defconfig         | 1 +
 configs/stm32mp15_trusted_defconfig | 1 +
 4 files changed, 7 insertions(+)

diff --git a/board/st/stm32mp1/stm32mp1.c b/board/st/stm32mp1/stm32mp1.c
index 84592677e4..45f2ca81a6 100644
--- a/board/st/stm32mp1/stm32mp1.c
+++ b/board/st/stm32mp1/stm32mp1.c
@@ -13,6 +13,7 @@
 #include <dm.h>
 #include <env.h>
 #include <env_internal.h>
+#include <fdt_simplefb.h>
 #include <fdt_support.h>
 #include <g_dnl.h>
 #include <generic-phy.h>
@@ -914,6 +915,9 @@ int ft_board_setup(void *blob, struct bd_info *bd)
 		if (IS_ENABLED(CONFIG_FDT_FIXUP_PARTITIONS))
 			fdt_fixup_mtdparts(blob, nodes, ARRAY_SIZE(nodes));
 
+	if (CONFIG_IS_ENABLED(FDT_SIMPLEFB))
+		fdt_simplefb_enable_and_mem_rsv(blob);
+
 	return 0;
 }
 #endif
diff --git a/configs/stm32mp15_basic_defconfig b/configs/stm32mp15_basic_defconfig
index 2cc26d4066..c9ed2239ca 100644
--- a/configs/stm32mp15_basic_defconfig
+++ b/configs/stm32mp15_basic_defconfig
@@ -34,6 +34,7 @@ CONFIG_SPL_DM_SPI_FLASH=y
 CONFIG_SPL_POWER=y
 CONFIG_SPL_SPI_FLASH_MTD=y
 CONFIG_SYS_SPI_U_BOOT_OFFS=0x80000
+CONFIG_FDT_SIMPLEFB=y
 CONFIG_SYS_PROMPT="STM32MP> "
 CONFIG_CMD_ADTIMG=y
 CONFIG_CMD_ERASEENV=y
diff --git a/configs/stm32mp15_defconfig b/configs/stm32mp15_defconfig
index 4c6a52fc54..e10f4cedc8 100644
--- a/configs/stm32mp15_defconfig
+++ b/configs/stm32mp15_defconfig
@@ -19,6 +19,7 @@ CONFIG_SYS_LOAD_ADDR=0xc2000000
 CONFIG_FIT=y
 CONFIG_BOOTDELAY=1
 CONFIG_BOOTCOMMAND="run bootcmd_stm32mp"
+CONFIG_FDT_SIMPLEFB=y
 CONFIG_SYS_PROMPT="STM32MP> "
 CONFIG_CMD_ADTIMG=y
 CONFIG_CMD_ERASEENV=y
diff --git a/configs/stm32mp15_trusted_defconfig b/configs/stm32mp15_trusted_defconfig
index feca26e973..83bd93e3a1 100644
--- a/configs/stm32mp15_trusted_defconfig
+++ b/configs/stm32mp15_trusted_defconfig
@@ -20,6 +20,7 @@ CONFIG_SYS_LOAD_ADDR=0xc2000000
 CONFIG_FIT=y
 CONFIG_BOOTDELAY=1
 CONFIG_BOOTCOMMAND="run bootcmd_stm32mp"
+CONFIG_FDT_SIMPLEFB=y
 CONFIG_SYS_PROMPT="STM32MP> "
 CONFIG_CMD_ADTIMG=y
 CONFIG_CMD_ERASEENV=y
-- 
2.25.1