linux-kernel - Re: [PATCH 1/2] gpio/generic: initialize basic_mmio

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Message-ID: <CACxGe6tbK3R9FgsjSbDQEtFavt9_3NWR3=kBgZtK3av3X41kaQ@mail.gmail.com>
Date:	Fri, 18 May 2012 23:45:11 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Shawn Guo <shawn.guo@...aro.org>,
	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	Lothar Waßmann <LW@...o-electronics.de>,
	Ryan Mallon <ryan@...ewatersys.com>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	"Hans J. Koch" <hjk@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] gpio/generic: initialize basic_mmio_gpio shadow
 variables properly

On Fri, May 18, 2012 at 11:44 PM, Grant Likely
<grant.likely@...retlab.ca> wrote:
> On Thu, 17 May 2012 15:35:02 +0800, Shawn Guo <shawn.guo@...aro.org> wrote:
>> It fixes the issue in gpio-generic that commit fb14921 (gpio/mxc: add
>> missing initialization of basic_mmio_gpio shadow variables) manged to
>> fix in gpio-mxc driver, so that other platform specific drivers do not
>> suffer from the same problem over and over again.
>>
>> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
>> ---
>>  drivers/gpio/gpio-generic.c |    4 ++++
>>  1 files changed, 4 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c
>> index e38dd0c..cfc9439 100644
>> --- a/drivers/gpio/gpio-generic.c
>> +++ b/drivers/gpio/gpio-generic.c
>> @@ -394,6 +394,10 @@ int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
>>               return ret;
>>
>>       bgc->data = bgc->read_reg(bgc->reg_dat);
>> +     if (bgc->gc.set == bgpio_set_set)
>> +             bgc->data = bgc->read_reg(bgc->reg_set);
>> +     if (bgc->reg_dir)
>> +             bgc->dir = bgc->read_reg(bgc->reg_dir);
>
> This assumes that the set and dir registers are actually readable
> which isn't the case on some hardware.  There needs to be a mechanism
> for drivers using bgpio_init to control how data & dir are initialized
> (possibly with some flags; maybe replace the big_endian arg with a
> flags arg).

If you can turn it around quickly, I'll still try to get it in for v3.5

g.
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