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Re: [PATCH v3 0/8] ARM: sunxi: Add Reduced Serial Bus support

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On Thu, Aug 20, 2015 at 12:32 AM, Mark Brown <broonie@kernel.org> wrote:
> On Wed, Aug 19, 2015 at 12:20:01PM +0800, Chen-Yu Tsai wrote:
>> 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.
>
> This is flagged as something that is specific to the Allwinner SoCs.
> Why add generic regmap support rather than just implement the regmap
> reg_read() and reg_write() in a regmap in the controller driver?  Are
> there expected to be other controller drivers from other vendors?

I don't expect there to be any other controller drivers. And it seems
at least some of the devices are dual interface (I2C/RSB). Though I
don't see how its connected to the generic regmap support. Regmap
is for device drivers connected to the RSB bus, not the bus controller
itself.

That said, there are a few RSB mfd slave devices that need support,
those being the later AXP series PMICs, and AC100/AC200 audio-codec/RTC
chips. The current axp20x driver already uses i2c regmaps.

I could throw all the RSB-related stuff together, presumably under
drivers/soc/sunxi/rsb, though that doesn't help the fact that common
regmap code would be  better than scattering regmap_* in various mfd
drivers.


Regards
ChenYu
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[PATCH v3 0/8] ARM: sunxi: Add Reduced Serial Bus support Chen-Yu Tsai <wens@csie.org> - 2015-08-19 06:30 +0200
  [PATCH v3 6/8] ARM: dts: sun8i: Add Reduced Serial Bus controller device node to A23/A33 dtsi Chen-Yu Tsai <wens@csie.org> - 2015-08-19 06:30 +0200
  [PATCH v3 3/8] rsb: Linux driver framework for Reduced Serial Bus (RSB) Chen-Yu Tsai <wens@csie.org> - 2015-08-19 06:30 +0200
    Re: [PATCH v3 3/8] rsb: Linux driver framework for Reduced Serial  Bus (RSB) Mark Brown <broonie@kernel.org> - 2015-08-20 19:10 +0200
  [PATCH v3 1/8] rsb: Add generic Reduced Serial Bus (RSB) controller binding documentation Chen-Yu Tsai <wens@csie.org> - 2015-08-19 06:30 +0200
    Re: [PATCH v3 1/8] rsb: Add generic Reduced Serial Bus (RSB)  controller binding documentation Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-08-20 17:10 +0200
      Re: [PATCH v3 1/8] rsb: Add generic Reduced Serial Bus (RSB)  controller binding documentation Chen-Yu Tsai <wens@csie.org> - 2015-08-20 18:00 +0200
        Re: [PATCH v3 1/8] rsb: Add generic Reduced Serial Bus (RSB)  controller binding documentation Maxime Ripard <maxime.ripard@free-electrons.com> - 2015-08-20 23:30 +0200
    Re: [PATCH v3 1/8] rsb: Add generic Reduced Serial Bus (RSB)  controller binding documentation Rob Herring <robherring2@gmail.com> - 2015-08-24 00:50 +0200
  Re: [PATCH v3 0/8] ARM: sunxi: Add Reduced Serial Bus support Mark Brown <broonie@kernel.org> - 2015-08-19 18:40 +0200
    Re: [PATCH v3 0/8] ARM: sunxi: Add Reduced Serial Bus support Chen-Yu Tsai <wens@csie.org> - 2015-08-20 04:10 +0200
      Re: [PATCH v3 0/8] ARM: sunxi: Add Reduced Serial Bus support Mark Brown <broonie@kernel.org> - 2015-08-20 19:10 +0200

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