Hi all, Some Renesas SoCs may exist in different revisions, providing slightly different functionalities (e.g. R-Car H3 ES1.x and ES2.0), and behavior (errate and quirks). 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 7 patches: - Patches 1-4 provide soc_device_match(), with some related fixes, - Patches 5-7 implement identification of Renesas SoCs and registration with the SoC bus, Changes compared to v1: - Add Acked-by, - New patches: - "[4/7] base: soc: Provide a dummy implementation of soc_device_match()", - "[5/7] ARM: shmobile: Document DT bindings for CCCR and PRR", - "[6/7] arm64: dts: r8a7795: Add device node for PRR" (more similar patches available, I'm not yet spamming you all with them), - Drop SoC families and family names; use fixed "Renesas" instead, - Drop EMEV2, which doesn't have a chip ID register, and doesn't share devices with other SoCs, - Drop RZ/A1H and R-CAR M1A, which don't have chip ID registers (for M1A: not accessible from the ARM core?), - On arm, move "select SOC_BUS" from ARCH_RENESAS to Kconfig symbols for SoCs that provide a chip ID register, - Build renesas-soc only if SOC_BUS is enabled, - Use "renesas,prr" and "renesas,cccr" device nodes in DT if available, else fall back to hardcoded addresses for compatibility with existing DTBs, - Remove verification of product IDs; just print the ID instead, - Don't register the SoC bus if the chip ID register is missing, - Change R-Mobile APE6 fallback to use PRR instead of CCCR (it has both). Merge strategy: - In theory, patches 1-4 should go through Greg's driver core tree. But it's a hard dependency for all users. If people agree, I can provide an immutable branch in my renesas-drivers repository, to be merged by all interested parties. So far I'm aware of Freescale/NXP, and Renesas. - Patches 5-7 obviously have to go through Simon's Renesas tree (after merging the soc_device_match() core), and arm-soc. Tested on (machine, soc_id, optional revision): EMEV2 KZM9D Board, emev2 Genmai, r7s72100 APE6EVM, r8a73a4, ES1.0 armadillo 800 eva, r8a7740, ES2.0 bockw, r8a7778 marzen, r8a7779, ES1.0 Lager, r8a7790, ES1.0 Koelsch, r8a7791, ES1.0 Porter, r8a7791, ES3.0 Blanche, r8a7792, ES1.1 Gose, r8a7793, ES1.0 Alt, r8a7794, ES1.0 Renesas Salvator-X board based on r8a7795, r8a7795, ES1.0 Renesas Salvator-X board based on r8a7795, r8a7795, ES1.1 Renesas Salvator-X board based on r8a7796, r8a7796, ES1.0 KZM-A9-GT, sh73a0, ES2.0 For your convenience, this series (incl. more DT updates to add device nodes for CCCR and PRR to all other Renesas ARM SoCs) is also available in the topic/renesas-soc-id-v2 branch of my renesas-drivers git repository at git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git Its first user is support for R-Car H3 ES2.0 in branch topic/r8a7795-es2-v1-rebased2. Thanks for your comments! Arnd Bergmann (1): base: soc: Introduce soc_device_match() interface Geert Uytterhoeven (6): base: soc: Early register bus when needed base: soc: Check for NULL SoC device attributes base: soc: Provide a dummy implementation of soc_device_match() ARM: shmobile: Document DT bindings for CCCR and PRR arm64: dts: r8a7795: Add device node for PRR soc: renesas: Identify SoC and register with the SoC bus Documentation/devicetree/bindings/arm/shmobile.txt | 26 +++++ arch/arm/mach-shmobile/Kconfig | 3 + arch/arm64/Kconfig.platforms | 1 + arch/arm64/boot/dts/renesas/r8a7795.dtsi | 5 + drivers/base/Kconfig | 1 + drivers/base/soc.c | 79 +++++++++++++ drivers/soc/renesas/Makefile | 2 + drivers/soc/renesas/renesas-soc.c | 130 +++++++++++++++++++++ include/linux/sys_soc.h | 9 ++ 9 files changed, 256 insertions(+) create mode 100644 drivers/soc/renesas/renesas-soc.c -- 1.9.1 Gr{oetje,eeting}s, Geert -- 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 -- 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