board: stm32mp1: enable simple framebuffer node for splashscreen

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@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>

diff --git a/board/st/stm32mp1/stm32mp1.c b/board/st/stm32mp1/stm32mp1.c
index 84592677e4af563bc3a3bc58e48a10350891c33d..45f2ca81a64f7e032351b232954b0f79addde0f2 100644 (file)
--- 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 2cc26d40668a9619c74d7ac18d95008860fc6ba6..c9ed2239ca6998206b35eaf74fad9ba723509d79 100644 (file)
--- 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 7b844a3e46eedb98b95fccb822f69322259e82d3..36ebeb4470dcffe6c1a874c4495d6e2ba7cf5fd0 100644 (file)
--- 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 270cbaa733501577b8eecd478bb94deda6f77b9b..63eeb507197d9fc0dd2f62c2f86a3a8ccffab0a8 100644 (file)
--- 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