linux-kernel - Re: [PATCH v2 16/16] mmc: host: omap_hsmmc: use "mmc_of_parse_voltage" to get ocr

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Date:	Wed, 11 Nov 2015 12:40:23 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Roger Quadros <rogerq@...com>
Cc:	Kishon Vijay Abraham I <kishon@...com>,
	Andreas Fenkart <afenkart@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	linux-omap <linux-omap@...r.kernel.org>,
	Sekhar Nori <nsekhar@...com>,
	Lokesh Vutla <lokeshvutla@...com>,
	Murali Karicheri <m-karicheri2@...com>,
	Franklin S Cooper Jr <fcooper@...com>
Subject: Re: [PATCH v2 16/16] mmc: host: omap_hsmmc: use "mmc_of_parse_voltage"
 to get ocr_avail

On 11 November 2015 at 11:26, Roger Quadros <rogerq@...com> wrote:
> Hi,
>
> On 25/08/15 17:50, Ulf Hansson wrote:
>> On 3 August 2015 at 14:26, Kishon Vijay Abraham I <kishon@...com> wrote:
>>> From: Roger Quadros <rogerq@...com>
>>>
>>> For platforms that doesn't have explicit regulator control in MMC,
>>> populate voltage-ranges in MMC device tree node and use
>>> mmc_of_parse_voltage to get ocr_avail
>>
>> I don't like this.
>>
>> If we are able to fetch the OCR mask via an external regulator, that
>> shall be done.
>
> Agreed.
>>
>> I think the mmc_of_parse_voltage() API and the corresponding DT
>> binding it parses, should be used for those HW when we don't have an
>> external regulator to use. For example if the MMC controller itself
>> somehow controls the voltage levels. Is that really the case for you?
>
> What shall be done if there is no software control of the external regulator
> and it is fixed at a certain voltage?

I think you can model that as a so called fixed regulator.

Kind regards
Uffe
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