linux-kernel - Re: [PATCH v5 0/5] ARM: sunxi: Add Reduced Serial Bus support

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Message-ID: <20151007100001.GD2278@lukather>
Date:	Wed, 7 Oct 2015 11:00:01 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Mark Brown <broonie@...nel.org>,
	Hans de Goede <hdegoede@...hat.com>, shuge@...winnertech.com,
	Joe Perches <joe@...ches.com>, linux-sunxi@...glegroups.com,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/5] ARM: sunxi: Add Reduced Serial Bus support

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().

Applied, thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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