@@ -9,6 +9,7 @@
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
+#include <asm/system_info.h>
#include "platsmp.h"
@@ -23,7 +24,17 @@ static const char * const bcm2835_compat[] = {
NULL
};
+static void __init bcm2835_init(void)
+{
+ struct device_node *np = of_find_node_by_path("/system");
+ u32 val;
+
+ if (!of_property_read_u32(np, "linux,revision", &val))
+ system_rev = val;
+}
+
DT_MACHINE_START(BCM2835, "BCM2835")
.dt_compat = bcm2835_compat,
.smp = smp_ops(bcm2836_smp_ops),
+ .init_machine = bcm2835_init,
MACHINE_END
The Raspberry Pi bootloader provides a revision code[0] in the devicetree, at /system/linux,revision. The downstream kernel then uses this DT property to fill the system_rev variable, which is exposed to userspace via the "Revision" field in /proc/cpuinfo. Some software[1] relies on this in order to determine the Raspberry Pi model. This patch ports the revision detection from the downstream Raspberry Pi kernel. [0]: https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#new-style-revision-codes [1]: https://github.com/hzeller/rpi-rgb-led-matrix/blob/a3eea997a9254b83ab2de97ae80d83588f696387/lib/gpio.cc#L247 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> --- arch/arm/mach-bcm/board_bcm2835.c | 11 +++++++++++ 1 file changed, 11 insertions(+) -- 2.43.0