[PATCH v5 0/5] ARM: sunxi: Add Reduced Serial Bus support
maxime.ripard at free-electrons.com
Wed Oct 7 03:00:01 PDT 2015
On Thu, Oct 01, 2015 at 07:57:46PM +0800, Chen-Yu Tsai wrote:
> Hi everyone,
> This is my fifth 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.
> v4 and later adds a platform driver for the RSB controller under
> drivers/soc/sunxi, which adds a custom driver type and bus type
> for slave drivers to use. Custom regmap support is also merged
> into the controller driver. Currently the driver only exports 2
> symbols: sunxi_rsb_driver_register() & __devm_regmap_init_sunxi_rsb().
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
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