lkml.org 
[lkml]   [2018]   [Feb]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v1 3/4] ASoC: codecs: pcm179x: Add reset gpio
On Tue, Feb 27, 2018 at 6:24 PM, Mylène Josserand
<mylene.josserand@bootlin.com> wrote:

> + pcm179x->reset = of_get_named_gpio(np, "reset-gpios", 0);
> + if (gpio_is_valid(pcm179x->reset)) {
> + ret = devm_gpio_request_one(dev, pcm179x->reset,
> + GPIOF_OUT_INIT_LOW,
> + "pcm179x reset");
> + if (ret) {
> + dev_err(dev,
> + "Failed to request GPIO %d as reset pin, error %d\n",
> + pcm179x->reset, ret);
> + return ret;
> + }
> +
> + gpio_set_value(pcm179x->reset, 1);

It would be better to use the gpiod API, which takes the GPIO polarity
into account.

There may be systems that have an inverter connected to this pin, and
this can be changed in dts via GPIO_ACTIVE_HIGH.

Also, as the reset pin can be connected to an I2C expander, for
example, so it is safer to use the cansleep variant:

gpiod_set_value_cansleep(pcm179x->reset, 0);

\
 
 \ /
  Last update: 2018-02-27 23:30    [W:0.186 / U:1.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site