linux-kernel - Re: [PATCH v3 2/3] gpio: pca953x: add support for pca9505

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Message-ID: <51045261.5020709@free-electrons.com>
Date:	Sat, 26 Jan 2013 23:02:09 +0100
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Haojian Zhuang <haojian.zhuang@...aro.org>,
	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 2/3] gpio: pca953x: add support for pca9505

On 01/25/2013 09:51 AM, Linus Walleij wrote:
> On Fri, Jan 25, 2013 at 9:36 AM, Gregory CLEMENT
> <gregory.clement@...e-electrons.com> wrote:
> 
>> Well, at the beginning I thought adding support for pca9505 was just a matter
>> of a couple of lines to add. Then I realized that I need to handle the 40 bits
>> case, and I ended up refactoring all access to the registers. So now I am on it,
>> it seems I am volunteer to continue to improve this driver.
> 
> I like the sound of this ;-)

I was about to fix the issues you have pointed but I didn't find anything like

#ifdef CONFIG_ARCH_PXA
        if (cpu_is_pxa25x()) {
#ifdef CONFIG_CPU_PXA26x
                count = 89;
                gpio_type = PXA26X_GPIO;
#elif defined(CONFIG_PXA25x)


in the pca953x driver! I think you messed up with another patch set!

I saw that Haojian Zhuang have sent a patch set for gpio-pxa and
among this set the patch "[PATCH 06/10] gpio: pxa: define nr gpios
in platform data" seemed to exactly what you've expected.

> 
> To get you started I just sent out two other patches you can consider
> as RFC, they're regrettably not even compile-tested. I mainly wanted
> to indicate what needs to be done so we can throw them away, just
> wanted to give a hint.
> 
>> However I won't be able to test it, the only PXA based platform I have is a
>> Zaurus SL-C3100 which embeds a PXA270 if I remember well, but I doubt it come
>> with gpio expander on i2c.
> 
> Well I guess if there is nobody testing it, then nobody cares.
> The world must be full of people with PXA platforms doing nothing
> but regression testing...
> 
> Actually just days ago I asked Haoijan to help me testing a set of
> patches for the PXA SPI controller, and he kindly helped out, so there
> are some people booting these platforms, sometimes :-)
> 
> Yours,
> Linus Walleij
> 


-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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