lkml.org 
[lkml]   [2017]   [Dec]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] pinctrl: rockchip: enable clock when reading pin direction register
Date
Hi Brian,

Am Dienstag, 12. Dezember 2017, 09:43:43 CET schrieb Brian Norris:
> We generally leave the GPIO clock disabled, unless an interrupt is
> requested or we're accessing IO registers. We forgot to do this for the
> ->get_direction() callback, which means we can sometimes [1] get
> incorrect results [2] from, e.g., /sys/kernel/debug/gpio.
>
> Enable the clock, so we get the right results!
>
> [1] Sometimes, because many systems have 1 or mor interrupt requested on
> each GPIO bank, so they always leave their clock on.
>
> [2] Incorrect, meaning the register returns 0, and so we interpret that
> as "input".
>
> Signed-off-by: Brian Norris <briannorris@chromium.org>

thanks for catching this and it looks good to me, so
Reviewed-by: Heiko Stuebner <heiko@sntech.de>

\
 
 \ /
  Last update: 2017-12-12 19:20    [W:0.050 / U:0.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site