From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wolfram Sang <wsa@the-dreams.de>
Subject: Re: [PATCH 07/25] mmc: sdhci-pci: Use ACPI DSM to get driver
 strength for some Intel devices
Date: Tue, 4 Apr 2017 10:48:47 +0200
Message-ID: <20170404084847.GB1439@katana>
References: <1490032253-6030-1-git-send-email-adrian.hunter@intel.com>
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To: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>, linux-mmc <linux-mmc@vger.kernel.org>, Al Cooper <alcooperx@gmail.com>, Jaedon Shin <jaedon.shin@gmail.com>, Haibo Chen <haibo.chen@nxp.com>, Dong Aisheng <aisheng.dong@nxp.com>, Shawn Lin <shawn.lin@rock-chips.com>, Douglas Anderson <dianders@chromium.org>, Zach Brown <zach.brown@ni.com>, Ludovic Desroches <ludovic.desroches@atmel.com>, Jisheng Zhang <jszhang@marvell.com>, Yangbo Lu <yangbo.lu@nxp.com>, Jaehoon Chung <jh80.chung@samsung.com>, Weijun Yang <Weijun.Yang@csr.com>, Barry Song <Baohua.Song@csr.com>, Peter Griffin <peter.griffin@linaro.org>, Lee Jones <lee.jones@linaro.org>, Jon Hunter <jonathanh@nvidia.com>, Harjani Ritesh <riteshh@codeaurora.org>


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Hi Adrian,

On Mon, Mar 20, 2017 at 07:50:35PM +0200, Adrian Hunter wrote:
> Make use  of an Intel ACPI _DSM that provides eMMC driver strength.
>=20
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

This is an interesting patch for me because it seems I have to deal with
drive-strength soon, as well, for the SDHI driver. You basically fall
back here to simply read the drive strength value from ACPI, right? So,
do you think it makes sense then to have a similar encoded value from DT
(maybe "mmc-fixed-driver-type-<n>" with n=3D0..4)? This is a largely
reduced encoding of what you proposed in 2015 [1] but may be more
pragmatic for soldered on-board devices working on their max speeds with
fixed voltages and frequencies? Or did I get something wrong?

Thanks,

   Wolfram

[1] https://lkml.org/lkml/2015/2/16/273



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