[PATCH 0/4] soc: renesas: Identify SoC and register with the SoC bus

From: Geert Uytterhoeven
Date: Tue Oct 04 2016 - 05:09:56 EST

Hi all,

Some Renesas SoCs may exist in different revisions, providing slightly
different functionalities (e.g. R-Car H3 ES1.x and ES2.0). This needs to
be catered for by drivers and/or platform code. The recently proposed
soc_device_match() API seems like a good fit to handle this.

This patch series implements the core infrastructure to provide SoC and
revision information through the SoC bus for Renesas ARM SoCs. It
consists of 4 patches:
- Patch 1 avoids a crash when SoC revision information is needed and
provided early,
- Patch 2 (from Arnd) introduces the soc_device_match() API.
I don't know if, when, and through which channel this patch is
planned to go upstream,
- Patch 3 fixes a bug in soc_device_match(), causing a crash when
trying to match on an SoC attribute that is not provided (seen on
EMEV2, RZ/A, and R-Car M1A, which lack revision information),
- Patch 4 identifies Renesas SoCs and registers them with the SoC bus.

Tested on (family, machine, soc_id, optional revision):

Emma Mobile EV2, EMEV2 KZM9D Board, emev2
RZ/A, Genmai, r7s72100
R-Mobile, APE6EVM, r8a73a4, ES1.0
R-Mobile, armadillo 800 eva, r8a7740, ES2.0
R-Car Gen1, bockw, r8a7778
R-Car Gen1, marzen, r8a7779, ES1.0
R-Car Gen2, Lager, r8a7790, ES1.0
R-Car Gen2, Koelsch, r8a7791, ES1.0
R-Car Gen2, Gose, r8a7793, ES1.0
R-Car Gen2, Alt, r8a7794, ES1.0
R-Car Gen3, Renesas Salvator-X board based on r8a7795, r8a7795, ES1.0
R-Car Gen3, Renesas Salvator-X board based on r8a7796, r8a7796, ES1.0
SH-Mobile, KZM-A9-GT, sh73a0, ES2.0

For your convenience, this series is also available in the
topic/renesas-soc-id-v1 branch of my renesas-drivers git repository at

Thanks for your comments!

Arnd Bergmann (1):
base: soc: Introduce soc_device_match() interface

Geert Uytterhoeven (3):
base: soc: Early register bus when needed
base: soc: Check for NULL SoC device attributes
[RFC] soc: renesas: Identify SoC and register with the SoC bus

arch/arm/mach-shmobile/Kconfig | 1 +
arch/arm64/Kconfig.platforms | 1 +
drivers/base/Kconfig | 1 +
drivers/base/soc.c | 79 +++++++++++
drivers/soc/renesas/Makefile | 2 +
drivers/soc/renesas/renesas-soc.c | 266 ++++++++++++++++++++++++++++++++++++++
include/linux/sys_soc.h | 3 +
7 files changed, 353 insertions(+)
create mode 100644 drivers/soc/renesas/renesas-soc.c




Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds