lkml.org 
[lkml]   [2014]   [Apr]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 1/2] gpio: pl061: get gpio base from alias id
From
On Fri, Apr 25, 2014 at 2:27 AM, Haojian Zhuang
<haojian.zhuang@linaro.org> wrote:

> Go it. But the gpio sysfs interface is using the gpio name with an
> internal number. It'll make developer confusion since it's different
> from datasheet
> or schematics. Is there any plan to remove the confusion?

First I am as always very suspicious about the sysfs interface
since it is often used for madness like reimplementing
leds-gpio.c, gpio_keys.c, extcon-gpio.c, gpio-regulator.c
spi-gpio.c, w1-gpio.c or gpio_wdt.c in userspace for no
good reason when the kernel should handle it.

Yet there are exceptions where it's actually warranted.

There is a possibility to set a label on the gpio line,
so this should be used.

C.f.
commit 781f6d710d4482eab05cfaad50060a0ea8c0e4e0
"gpio: generic: Add label to platform data"

Something like this is needed in this and other drivers
needing to label its GPIO lines. It's much like how we name
all pins in a pin controller really.

I don't exactly know how we should achieve the same
for labels to offsets in any given gpio_chip using
some generic device tree labels for example, but I
imagine it could be implemented in a generic fashion?

Describing the names of gpio lines should be quite
obvious hardware description suitable for the device
tree.

Yours,
Linus Walleij


\
 
 \ /
  Last update: 2014-04-25 12:41    [W:0.081 / U:0.484 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site