linux-kernel - Re: [PATCH v3 1/3] gpio: pca953x: make the register access by GPIO bank

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Date:	Fri, 25 Jan 2013 09:03:04 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Andreas Schallenberg <Andreas.Schallenberg@...itytechnica.com>,
	Roland Stigge <stigge@...com.de>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] gpio: pca953x: make the register access by GPIO bank

On Tue, Jan 22, 2013 at 10:10 PM, Gregory CLEMENT
<gregory.clement@...e-electrons.com> wrote:

> Until now the pca953x driver accessed all the bank of a given register
> in a single command using only a 32 bits variable. New expanders from
> the pca53x family come with 40 GPIOs which no more fit in a 32
> variable. This patch make access to the registers more generic by
> relying on an array of u8 variables. This fits exactly the way the
> registers are represented in the hardware.
>
> It also adds helpers to access to a single register of a bank instead
> of reading or writing all the banks for a given register.
>
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> Tested-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

This is a nice refactoring and tested too, so patch applied.

I have some nitpicks, may try to fix them with a follow-up
patch but it's certainly not super-important stuff.

Yours,
Linus Walleij
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