linux-kernel - Re: [PATCH 0/2] add regulator driver and mfd cell for Intel Cherry Trail Whiskey Cove PMIC

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Message-ID: <20191025075540.GD32742@smile.fi.intel.com>
Date:   Fri, 25 Oct 2019 10:55:40 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andrey Zhizhikin <andrey.z@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, lee.jones@...aro.org,
        linux-kernel@...r.kernel.org,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>
Subject: Re: [PATCH 0/2] add regulator driver and mfd cell for Intel Cherry
 Trail Whiskey Cove PMIC

On Fri, Oct 25, 2019 at 10:53:35AM +0300, Andy Shevchenko wrote:
> On Thu, Oct 24, 2019 at 02:29:37PM +0000, Andrey Zhizhikin wrote:
> > This patchset introduces additional regulator driver for Intel Cherry
> > Trail Whiskey Cove PMIC. It also adds a cell in mfd driver for this
> > PMIC, which is used to instantiate this regulator.
> > 
> > Regulator support for this PMIC was present in kernel release from Intel
> > targeted Aero platform, but was not entirely ported upstream and has
> > been omitted in mainline kernel releases. Consecutively, absence of
> > regulator caused the SD Card interface not to be provided with Vqcc
> > voltage source needed to operate with UHS-I cards.
> > 
> > Following patches are addessing this issue and making sd card interface
> > to be fully operable with UHS-I cards. Regulator driver lists an ACPI id
> > of the SD Card interface in consumers and exposes optional "vqmmc"
> > voltage source, which mmc driver uses to switch signalling voltages
> > between 1.8V and 3.3V. 
> > 
> > This set contains of 2 patches: one is implementing the regulator driver
> > (based on a non upstreamed version from Intel Aero), and another patch
> > registers this driver as mfd cell in exising Whiskey Cove PMIC driver.
> 
> Thank you.
> Hans, Cc'ed, has quite interested in these kind of patches.
> Am I right, Hans?

Since it's about UHS/SD, Cc to Adrian as well.

-- 
With Best Regards,
Andy Shevchenko