From: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Wei Ni <wni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Cc: Guenter Roeck <linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>,
"khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org"
<khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>,
"swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org"
<swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
"lm-sensors-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org"
<lm-sensors-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org>,
"linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH v3 1/2] hwmon: (lm90) Add power control
Date: Tue, 10 Sep 2013 11:13:59 +0100 [thread overview]
Message-ID: <20130910101359.GX29403@sirena.org.uk> (raw)
In-Reply-To: <522EB0AF.9030708-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
[-- Attachment #1: Type: text/plain, Size: 623 bytes --]
On Tue, Sep 10, 2013 at 01:39:59PM +0800, Wei Ni wrote:
> I think the device need time to wait stable after power on, but it's
> difficult to get an exact delay value, and this delay may also relate
> with platform design, so how about to add a optional property in the DT
> node, such as "power-on-delay-ms" ?
This is something you should *really* be able to get from the datasheet
for the part - this sort of stuff has to be documented for hardware to
be used robustly. It seems entirely possible that you are working
around an issue with the regulator driver you are using not correctly
providing its ramp time here.
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next prev parent reply other threads:[~2013-09-10 10:13 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-09 10:29 [PATCH v3 0/2] Add power control for lm90 Wei Ni
[not found] ` <1378722552-10357-1-git-send-email-wni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-09-09 10:29 ` [PATCH v3 1/2] hwmon: (lm90) Add power control Wei Ni
[not found] ` <1378722552-10357-2-git-send-email-wni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-09-09 11:12 ` Mark Brown
[not found] ` <20130909111242.GW29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-09 11:34 ` Guenter Roeck
[not found] ` <522DB253.6000707-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2013-09-09 13:50 ` Mark Brown
2013-09-09 15:50 ` Guenter Roeck
2013-09-09 16:02 ` Mark Brown
2013-09-09 16:17 ` Guenter Roeck
[not found] ` <20130909161735.GC18975-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2013-09-09 20:39 ` Mark Brown
[not found] ` <20130909203910.GV29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-10 4:05 ` Wei Ni
[not found] ` <522E9A85.9050803-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-09-10 4:50 ` Guenter Roeck
[not found] ` <522EA51C.90706-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2013-09-10 5:39 ` Wei Ni
[not found] ` <522EB0AF.9030708-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-09-10 5:54 ` Guenter Roeck
[not found] ` <522EB41E.9030005-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2013-09-10 6:30 ` Wei Ni
2013-09-10 10:13 ` Mark Brown [this message]
2013-09-10 11:29 ` Wei Ni
[not found] ` <522F02A4.7060702-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-09-10 12:11 ` Mark Brown
[not found] ` <20130910121157.GJ29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-11 9:40 ` Wei Ni
[not found] ` <20130909155043.GA18975-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2013-09-10 3:22 ` Wei Ni
[not found] ` <522E9059.3070305-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-09-10 3:36 ` Guenter Roeck
[not found] ` <522E93D6.2010304-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2013-09-10 3:40 ` Stephen Warren
2013-09-10 3:53 ` Guenter Roeck
[not found] ` <522E97CE.4070300-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2013-09-10 4:12 ` Wei Ni
2013-09-10 4:13 ` Stephen Warren
[not found] ` <522E9C84.9070405-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-09-10 4:44 ` Guenter Roeck
2013-09-10 10:09 ` Mark Brown
[not found] ` <20130910100939.GW29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-10 15:07 ` Stephen Warren
[not found] ` <522F35BF.6070909-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-09-10 17:04 ` Mark Brown
[not found] ` <20130910170438.GS29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-10 17:44 ` Stephen Warren
[not found] ` <522F5A65.8040907-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-09-10 18:07 ` Guenter Roeck
2013-09-10 18:18 ` Mark Brown
[not found] ` <20130910181837.GD29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-10 18:37 ` Stephen Warren
2013-09-10 18:52 ` Mark Brown
[not found] ` <20130910185235.GF29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-11 11:35 ` Wei Ni
2013-09-10 17:05 ` Mark Brown
2013-09-09 10:29 ` [PATCH v3 2/2] Documentation: dt: hwmon: add OF document for LM90 Wei Ni
[not found] ` <1378722552-10357-3-git-send-email-wni-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-09-09 10:52 ` Guenter Roeck
[not found] ` <522DA86B.6000603-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2013-09-09 22:14 ` Stephen Warren
[not found] ` <522E4854.1050800-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-09-10 4:25 ` Wei Ni
2013-09-09 10:57 ` Ramkumar Ramachandra
[not found] ` <CALkWK0nqgF6yn4QRe2tTD-Qd+5GLtH-ifCesayk-+uxkWMx-5w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-09-10 4:35 ` Wei Ni
[not found] ` <522EA177.6050608-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-09-10 4:36 ` Wei Ni
2013-09-09 22:15 ` Stephen Warren
[not found] ` <522E489D.6080903-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-09-09 22:23 ` Guenter Roeck
[not found] ` <20130909222330.GA31708-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
2013-09-10 4:25 ` Wei Ni
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