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

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Date:   Mon, 15 Apr 2019 19:39:09 +0000
From:   Hartley Sweeten <HartleyS@...ionengravers.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>
CC:     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 12:25 PM, Arnd Bergmann wrote:
> We can communicate the clock rate using platform data rather than setting a
> flag to use a particular value in the driver, which is cleaner and avoids the dependency.
>
> No platform in the kernel currently defines the ep93xx keypad device structure, so this
> is a rather pointless excercise.  Any out of tree users are probably dead now, but if not,
>  they have to change their platform code to match the new platform_data structure.

<snip>

> diff --git a/include/linux/platform_data/keypad-ep93xx.h b/include/linux/platform_data/keypad-ep93xx.h
> index 0e36818e3680..3054fced8509 100644
> --- a/include/linux/platform_data/keypad-ep93xx.h
> +++ b/include/linux/platform_data/keypad-ep93xx.h
> @@ -9,8 +9,7 @@ struct matrix_keymap_data;
>  #define EP93XX_KEYPAD_DIAG_MODE		(1<<1)	/* diagnostic mode */
>  #define EP93XX_KEYPAD_BACK_DRIVE	(1<<2)	/* back driving mode */
>  #define EP93XX_KEYPAD_TEST_MODE		(1<<3)	/* scan only column 0 */
> -#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.

Hartley