Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]


Groups > linux.kernel > #1452544

Re: [v3,2/6] power: add power sequence library

From Matthias Kaehlcke <mka@chromium.org>
Newsgroups linux.kernel
Subject Re: [v3,2/6] power: add power sequence library
Date 2016-07-29 22:10 +0200
Message-ID <s0mgx-Yp-15@gated-at.bofh.it> (permalink)
References <s0mgx-Yp-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw


Hi Peter,

Thanks for your work on this, a few comments inline


On 07/20/2016 02:40 AM, Peter Chen wrote:

> ...
>
> +static int pwrseq_generic_on(struct device_node *np, struct pwrseq *pwrseq)
> +{
>
> ...
>
> +	if (gpiod_reset) {
> +		u32 duration_us = 50;
> +
> +		of_property_read_u32(np, "reset-duration-us",
> +				&duration_us);
> +		usleep_range(duration_us, duration_us + 10);
The end of the range could allow for more margin. Also consider busy 
looping for very short delays as in 
http://lxr.free-electrons.com/source/drivers/regulator/core.c#L2062
> ...
>
> +static int pwrseq_generic_get(struct device_node *np, struct pwrseq *pwrseq)
> +{
> +	struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq);
> +	enum of_gpio_flags flags;
> +	int reset_gpio, ret = 0;
> +
> +	pwrseq_gen->clk = of_clk_get_by_name(np, NULL);
This only gets the first of potentially multiple clocks, is that intended?

Back to linux.kernel | Previous | NextNext in thread | Find similar | Unroll thread


Thread

Re: [v3,2/6] power: add power sequence library Matthias Kaehlcke <mka@chromium.org> - 2016-07-29 22:10 +0200
  Re: [v3,2/6] power: add power sequence library Peter Chen <hzpeterchen@gmail.com> - 2016-08-01 04:30 +0200
  Re: [v3,2/6] power: add power sequence library Peter Chen <hzpeterchen@gmail.com> - 2016-08-02 05:50 +0200

csiph-web