ARM: bcm2835: Set Serial number and Revision

The VideoCore bootloader passes in Serial number and Revision number through Device Tree. Make these available to userspace through /proc/cpuinfo. Mainline status: There is a commit in linux-next that standardize passing the serial number through Device Tree (string: /serial-number): ARM: 8355/1: arch: Show the serial number from devicetree in cpuinfo There was an attempt to do the same with the revision number, but it didn't get in: [PATCH v2 1/2] arm: devtree: Set system_rev from DT revision Signed-off-by: Noralf Trønnes <[email protected]>
raspberrypi · Mar 9, 2022 · 3e787f9 · 3e787f9
1 parent e126abd
commit 3e787f9
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/arch/arm/mach-bcm/board_bcm2835.c b/arch/arm/mach-bcm/board_bcm2835.c
@@ -6,12 +6,25 @@
 #include <linux/init.h>
 #include <linux/irqchip.h>
 #include <linux/of_address.h>
+#include <asm/system_info.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 
 #include "platsmp.h"
 
+static void __init bcm2835_init(void)
+{
+	struct device_node *np = of_find_node_by_path("/system");
+	u32 val;
+	u64 val64;
+
+	if (!of_property_read_u32(np, "linux,revision", &val))
+		system_rev = val;
+	if (!of_property_read_u64(np, "linux,serial", &val64))
+		system_serial_low = val64;
+}
+
 static const char * const bcm2835_compat[] = {
 #ifdef CONFIG_ARCH_MULTI_V6
 	"brcm,bcm2835",
@@ -24,6 +37,7 @@ static const char * const bcm2835_compat[] = {
 };
 
 DT_MACHINE_START(BCM2835, "BCM2835")
+	.init_machine = bcm2835_init,
 	.dt_compat = bcm2835_compat,
 	.smp = smp_ops(bcm2836_smp_ops),
 MACHINE_END