linux-kernel - Re: [PATCH 3/3] gpio: pxa: add PXA1928 gpio type support

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Message-ID: <CAL_Jsq+aSgPceu-9Uyx_FqfAEMaSpmFD0JCVnydQNTm2G6_u0Q@mail.gmail.com>
Date:	Tue, 3 Feb 2015 07:44:27 -0600
From:	Rob Herring <robh@...nel.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jing Xiang <jxiang@...vell.com>,
	Xiangzhan Meng <mengxzh@...vell.com>
Subject: Re: [PATCH 3/3] gpio: pxa: add PXA1928 gpio type support

On Tue, Feb 3, 2015 at 6:41 AM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Tue, Jan 27, 2015 at 5:46 AM, Rob Herring <robh@...nel.org> wrote:
>
>> Add support for PXA1928 GPIOs. The PXA1928 adds a 6th bank from previous
>> generations.
>>
>> Signed-off-by: Jing Xiang <jxiang@...vell.com>
>> Signed-off-by: Xiangzhan Meng <mengxzh@...vell.com>
>> [robh: ported to 3.19 from vendor kernel]
>> Signed-off-by: Rob Herring <robh@...nel.org>
>> Cc: Linus Walleij <linus.walleij@...aro.org>
>> Cc: Alexandre Courbot <gnurou@...il.com>
>
> Patch applied...
>
>> -#define BANK_OFF(n)    (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
>> +#define BANK_OFF(n)    (((n) < 3) ? (n) << 2 : ((n) > 5 ? 0x200 : 0x100)       \
>> +                       + (((n) % 3) << 2))
>
> While this is a bit convoluted.
>
> Someone care to send a patch converting it to something like a
> parseable static inline?

I should have looked more closely than just taking the vendor code.
This was needlessly convoluted before and this just added on to it. It
can be simplified down to this:

#define BANK_OFF(n) (((n) / 3) << 8) + (((n) % 3) << 2)

I'll send a fix unless you want to fix up this patch.

Rob
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