[PATCH 2/2] meson: Add soc_rev to environment

[Stefan Agner]

From: Pascal Vizeli <pvizeli at syshack.ch>

Add SoC revision to environment. This can be useful to select the
correct device tree at runtime (N2/N2+).

Signed-off-by: Pascal Vizeli <pvizeli at syshack.ch>
Signed-off-by: Stefan Agner <stefan at agner.ch>
---

 arch/arm/include/asm/arch-meson/boot.h |  4 ++++
 arch/arm/mach-meson/board-info.c       | 12 ++++++++++++
 board/amlogic/odroid-n2/odroid-n2.c    |  5 +++++
 3 files changed, 21 insertions(+)

diff --git a/arch/arm/include/asm/arch-meson/boot.h b/arch/arm/include/asm/arch-meson/boot.h
index a90fe55081..c67d12d06c 100644
--- a/arch/arm/include/asm/arch-meson/boot.h
+++ b/arch/arm/include/asm/arch-meson/boot.h
@@ -7,6 +7,8 @@
 #ifndef __MESON_BOOT_H__
 #define __MESON_BOOT_H__
 
+#include <linux/types.h>
+
 /* Boot device */
 #define BOOT_DEVICE_RESERVED    0
 #define BOOT_DEVICE_EMMC        1
@@ -17,4 +19,6 @@
 
 int meson_get_boot_device(void);
 
+int meson_get_soc_rev(char *buff, size_t buff_len);
+
 #endif /* __MESON_BOOT_H__ */
diff --git a/arch/arm/mach-meson/board-info.c b/arch/arm/mach-meson/board-info.c
index a0bcf38f29..90e7dfaa3c 100644
--- a/arch/arm/mach-meson/board-info.c
+++ b/arch/arm/mach-meson/board-info.c
@@ -187,3 +187,15 @@ int show_board_info(void)
 
 	return 0;
 }
+
+int meson_get_soc_rev(char *buff, size_t buff_len)
+{
+	unsigned int socinfo;
+
+	socinfo = get_socinfo();
+	if (!socinfo)
+		return -1;
+
+	/* Write SoC info */
+	return snprintf(buff, buff_len, "%x", socinfo_to_minor(socinfo));
+}
diff --git a/board/amlogic/odroid-n2/odroid-n2.c b/board/amlogic/odroid-n2/odroid-n2.c
index caf7fd6810..dc0d933a39 100644
--- a/board/amlogic/odroid-n2/odroid-n2.c
+++ b/board/amlogic/odroid-n2/odroid-n2.c
@@ -12,6 +12,7 @@
 #include <asm/io.h>
 #include <asm/arch/sm.h>
 #include <asm/arch/eth.h>
+#include <asm/arch/boot.h>
 
 #define EFUSE_MAC_OFFSET	20
 #define EFUSE_MAC_SIZE		12
@@ -23,6 +24,10 @@ int misc_init_r(void)
 	char efuse_mac_addr[EFUSE_MAC_SIZE], tmp[3];
 	ssize_t len;
 
+	if (IS_ENABLED(CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG) &&
+	    meson_get_soc_rev(tmp, sizeof(tmp)) > 0)
+		env_set("soc_rev", tmp);
+
 	meson_eth_init(PHY_INTERFACE_MODE_RGMII, 0);
 
 	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
-- 
2.29.2