linux-kernel - RE: [PATCH 2/4] ARM: ep93xx: keypad: stop using mach/platform.h

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Date:   Mon, 15 Apr 2019 19:58:09 +0000
From:   Hartley Sweeten <HartleyS@...ionengravers.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Stefan Agner <stefan@...er.ch>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/4] ARM: ep93xx: keypad: stop using mach/platform.h

On Monday, April 15, 2019 12:47 PM, Arnd Bergmann wrote:
> On Mon, Apr 15, 2019 at 9:39 PM Hartley Sweeten <HartleyS@...ionengravers.com> wrote:
>>> -#define EP93XX_KEYPAD_KDIV           (1<<4)  /* 1/4 clock or 1/16 clock */
>>> -#define EP93XX_KEYPAD_AUTOREPEAT     (1<<5)  /* enable key autorepeat */
>>> +#define EP93XX_KEYPAD_AUTOREPEAT     (1<<4)  /* enable key autorepeat */
>>
>> You have re-defined the keypad register bits here.
>>
>> The KDIV bit changes the clock rate. The AUTOREPEAT bit enables key autorepeat.
>
> As far as I can tell, they are not register bits, just software flags for communicating between a
> board file and the driver, so I assumed I could freely reorganize them.
>
> Did I miss something?

Ugh.. It's been quite a while since I looked at that code...

Your correct, these are just flags to the driver.

The KeyScanInit register does have some bits that these flags effect but the driver deals
with them.

I have been buried updating an old PowerPC hardware/software design and haven't looked
at the EP93xx lately. My EP9307 board does have the keypad interface. Hopefully I will get
some time to check the latest mainline on it sometime soon.

Overall these patches look good. So, for the series...

Acked-by: H Hartley Sweeten <hsweeten@...ionengravers.com>