Hi everyone, This is my third attempt at adding support for Allwinner's Reduced Serial Bus (RSB), which is used to communicate with PMICs and other peripherals on their newer SoCs, such as the A23/A33/A80. RSB is a simplified two wire interface using push-pull outputs, supporting multiple slaves, address and data parity checks, and clock speeds up to 20 MHz. The bus only supports simple register read/writes, with possible register sizes of 8/16/32 bits. Access sizes not matching the slave device register sizes result in NACKs or errors. 32 bit registers in devices have yet to be seen. Previous attempts to add support through the I2C subsystem have been rejected, as the bus line protocol is too different to even consider. In this version, RSB is implemented as a new bus type, much like SPMI. Even though there will almost certainly be only one RSB driver, it's still split into the bus core framework and vendor specific driver, like other subsystems. Theoretically someone could implement a bit-banging driver for it. Patches 1 & 2 add the DT bindings for common RSB properties and the controller. Patches 3 & 4 add the RSB framework core and sunxi driver. Patch 5 (based on regmap/for-next) adds an RSB regmap driver. Patch 6 adds the RSB nodes for A23/A33 dtsi. Patch 7 & 8 enable the RSB controller on the boards I have. Still to come are axp20x driver support for the RSB based AXP223. The complete series can be found at: https://github.com/wens/linux/tree/sunxi-rsb-v3 Since this is a new subsystem, I'm not sure who should pick up the first 4 patches, or whether they are even in the right place. Any suggestions? Regards, ChenYu Chen-Yu Tsai (8): rsb: Add generic Reduced Serial Bus (RSB) controller binding documentation rsb: sunxi: Add Allwinner Reduced Serial Bus (RSB) controller bindings rsb: Linux driver framework for Reduced Serial Bus (RSB) rsb: sunxi: Add driver for Allwinner Reduced Serial Bus controller regmap: rsb: Add support for Reduced Serial Bus (RSB) based regmaps ARM: dts: sun8i: Add Reduced Serial Bus controller device node to A23/A33 dtsi ARM: dts: sun8i: ippo-q8h-v5: Enable Reduced Serial Bus controller ARM: dts: sun8i: sinlinx-sina33: Enable Reduced Serial Bus controller .../devicetree/bindings/rsb/rsb-sunxi.txt | 34 ++ Documentation/devicetree/bindings/rsb/rsb.txt | 50 ++ arch/arm/boot/dts/sun8i-a23-a33.dtsi | 21 + arch/arm/boot/dts/sun8i-a23-ippo-q8h-v5.dts | 4 + arch/arm/boot/dts/sun8i-a33-sinlinx-sina33.dts | 4 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/base/regmap/Kconfig | 6 +- drivers/base/regmap/Makefile | 1 + drivers/base/regmap/regmap-rsb.c | 121 +++++ drivers/rsb/Kconfig | 26 ++ drivers/rsb/Makefile | 6 + drivers/rsb/rsb-core.c | 511 +++++++++++++++++++++ drivers/rsb/rsb-sunxi.c | 441 ++++++++++++++++++ include/linux/regmap.h | 36 ++ include/linux/rsb.h | 144 ++++++ 16 files changed, 1407 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/rsb/rsb-sunxi.txt create mode 100644 Documentation/devicetree/bindings/rsb/rsb.txt create mode 100644 drivers/base/regmap/regmap-rsb.c create mode 100644 drivers/rsb/Kconfig create mode 100644 drivers/rsb/Makefile create mode 100644 drivers/rsb/rsb-core.c create mode 100644 drivers/rsb/rsb-sunxi.c create mode 100644 include/linux/rsb.h -- 2.5.0 -- 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