ARM: shmobile: APMU DT support via SMP Enable method [PATCH 01/04] devicetree: bindings: Renesas APMU and SMP Enable method [PATCH 02/04] ARM: shmobile: Add APMU DT support via Enable method [PATCH 03/04] ARM: shmobile: Add APMU nodes to r8a7791 DTSI [PATCH 04/04] ARM: shmobile: Remove r8a7791 non-DT APMU override These patches add DT support for the APMU hardware commonly found in Renesas R-Car Gen2 SoCs. Without these patches the APMU gets configured through data expressed in C, and with this series applied it is possible to describe the APMU configuration in DT and let the enable method point out that the APMU should be used. Patch 1 and 2 are Documenting and adding DT support to the APMU driver together with enabling use of the enable-method way to describe that the APMU hardware is needed for SMP operation. Patch 3 and 4 are related to r8a7791 support which gets a DTSI update to describe the APMU hardware. To avoid breaking support for older DTBs out in the wild these patches keep the older existing C code APMU configuration for r8a7791 as-is. During run-time, if the APMU is installed via the enable-method then it will not be overriden by older non-DT configuration. I suggest making APMU DT configuration mandatory for SMP operation on newer SoCs and that we keep the old APMU support code in place for a good number of kernel releases or until we can identify a couple of major reasons good enough to force a DTB update on the end users. The series have been tested on r8a7791 Koelsch in 4 cases: A) Default case when series is applied - 2 cores - OK (DT APMU) B) Like A) but r8a7791 smp_init() commented out - 2 cores - OK (DT APMU) C) Like B) but with patch 3 reverted - 1 core - OK (No SMP available) D) Like C) but reverted commented out code from B) - 2 cores - OK (C APMU) Signed-off-by: Magnus Damm <damm+renesas@xxxxxxxxxxxxx> --- Written against renesas-devel-20150519-v4.1-rc4 Documentation/devicetree/bindings/arm/cpus.txt | 1 Documentation/devicetree/bindings/power/renesas,apmu.txt | 31 ++++ arch/arm/boot/dts/r8a7791.dtsi | 7 + arch/arm/mach-shmobile/platsmp-apmu.c | 89 +++++++++++++- arch/arm/mach-shmobile/r8a7791.h | 2 arch/arm/mach-shmobile/setup-r8a7791.c | 2 arch/arm/mach-shmobile/smp-r8a7791.c | 11 + 7 files changed, 136 insertions(+), 7 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
