From: Laxman Dewangan <ldewangan@nvidia.com>
To: Mark Brown <broonie@kernel.org>
Cc: robh+dt@kernel.org, pawel.moll@arm.com, lgirdwood@gmail.com,
lee.jones@linaro.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/5] regulator: pwm: Add support for voltage linear equal steps
Date: Sun, 13 Mar 2016 18:36:06 +0530 [thread overview]
Message-ID: <56E565BE.5010703@nvidia.com> (raw)
In-Reply-To: <20160312060925.GW3898@sirena.org.uk>
On Saturday 12 March 2016 11:39 AM, Mark Brown wrote:
> * PGP Signed by an unknown key
>
> On Tue, Mar 08, 2016 at 04:23:24PM +0530, Laxman Dewangan wrote:
>
>> There is a use cases where entire voltage ranges from minimum
>> to maximum is divided into n equal steps and just providing the
>> steps count, the voltage table with duty cycles is linearly
>> calculated.
> I can't see any reason why this would ever be preferable to just using
> the flat linear range (you certainly haven't articulated one, you're
> just stating it). This seems like you are bodging around a limited
> consumer driver, you should fix the consumer to cope with regulators
> with lots of voltages - PWM regulators aren't the only ones with high
> resolution steps.
The requirement is to have perfect linear steps interms of the
period/pulse time of PWM without loosing any voltage.
Continuous mode is pretty much near to what you said but here we are
loosing the perfect step as this divides the periods to 100 parts and
then set voltage.
If new mode is not accpetable then need to enhance the existing
continuous mode like before scaling for 100% of period, first look if we
get the perfect pulse time of of PWM period and if it is there then use
this direct instead of converting required voltage to 100% scale and
then back calculating duty time.
next prev parent reply other threads:[~2016-03-13 13:06 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-08 10:53 [PATCH 0/5] regulator: pwm: Add supports for multiple instance and voltage linear steps Laxman Dewangan
2016-03-08 10:53 ` [PATCH 2/5] regulator: pwm: Add support to have multiple instance of pwm regulator Laxman Dewangan
[not found] ` <1457434405-30372-1-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-08 10:53 ` [PATCH 1/5] regulator: pwm: Fix calculation of voltage-to-duty cycle Laxman Dewangan
2016-03-08 10:53 ` [PATCH 3/5] regulator: pwm: Prints error number when it fails Laxman Dewangan
[not found] ` <1457434405-30372-4-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-12 6:05 ` Mark Brown
[not found] ` <20160312060543.GV3898-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-03-13 13:07 ` Laxman Dewangan
2016-03-08 10:53 ` [PATCH 4/5] regulator: pwm: Add support for voltage linear equal steps Laxman Dewangan
[not found] ` <1457434405-30372-5-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-12 6:09 ` Mark Brown
2016-03-13 13:06 ` Laxman Dewangan [this message]
[not found] ` <56E565BE.5010703-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-14 16:28 ` Mark Brown
2016-03-15 6:44 ` Laxman Dewangan
2016-03-08 10:53 ` [PATCH 5/5] regulator: pwm: Add DT binding details for Linear Equal Step Mode Laxman Dewangan
[not found] ` <1457434405-30372-6-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-03-17 15:27 ` Rob Herring
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