On Monday 06 July 2015 22:26:09 Pali Rohár wrote:
> With this patch "/revision" DT entry is used to set global system_rev
> variable. DT "/revision" is expected to be u32 numeric value.
>
> TODO: add documentation
>
> Signed-off-by: Pali Rohár <pali.rohar@xxxxxxxxx>
> ---
> arch/arm/kernel/devtree.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
> index 11c54de..7d82749 100644
> --- a/arch/arm/kernel/devtree.c
> +++ b/arch/arm/kernel/devtree.c
> @@ -19,6 +19,7 @@
> #include <linux/of_irq.h>
> #include <linux/of_platform.h>
> #include <linux/smp.h>
> +#include <linux/libfdt_env.h>
>
> #include <asm/cputype.h>
> #include <asm/setup.h>
> @@ -26,6 +27,7 @@
> #include <asm/smp_plat.h>
> #include <asm/mach/arch.h>
> #include <asm/mach-types.h>
> +#include <asm/system_info.h>
>
>
> #ifdef CONFIG_SMP
> @@ -204,6 +206,8 @@ static const void * __init arch_get_next_mach(const char *const **match)
> const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
> {
> const struct machine_desc *mdesc, *mdesc_best = NULL;
> + unsigned long dt_root;
> + const u32 *rev;
>
> #ifdef CONFIG_ARCH_MULTIPLATFORM
> DT_MACHINE_START(GENERIC_DT, "Generic DT based system")
> @@ -215,17 +219,16 @@ const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
> if (!dt_phys || !early_init_dt_verify(phys_to_virt(dt_phys)))
> return NULL;
>
> + dt_root = of_get_flat_dt_root();
> mdesc = of_flat_dt_match_machine(mdesc_best, arch_get_next_mach);
>
> if (!mdesc) {
> const char *prop;
> int size;
> - unsigned long dt_root;
>
> early_print("\nError: unrecognized/unsupported "
> "device tree compatible list:\n[ ");
>
> - dt_root = of_get_flat_dt_root();
> prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
> while (size > 0) {
> early_print("'%s' ", prop);
> @@ -246,5 +249,10 @@ const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
> /* Change machine number to match the mdesc we're using */
> __machine_arch_type = mdesc->nr;
>
> + /* Set system revision from DT */
> + rev = of_get_flat_dt_prop(dt_root, "revision", NULL);
> + if (rev)
> + system_rev = fdt32_to_cpu(*rev);
> +
> return mdesc;
> }
This patch and second one (with subject "[PATCH 2/5] arm: boot: convert
ATAG_REVISION to DT "/revision" entry") are still needed.
Are there any objections for them? If not, I will add missing DT
documentation and will resend them.
--
Pali Rohár
pali.rohar@xxxxxxxxx
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