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: Wed, 19 Apr 2017 14:24:20 +0200
Message-ID: <20170419122419.GA3832@katana>
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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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> > 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)?
>=20
> The _DSM, being a device-specific method does not have to support differe=
nt
> devices with different requirements whereas DT does.

So, it is more like a vendor specific property (e.g. "renesas,
mmc-driver-type")? Sorry, I don't know much about ACPI.

> >                                                  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?
>=20
> What I proposed was being forced on me by the requirement to provide a
> solution that could meet any conceivable need.  That gets over-complicate=
d.

Yeah, that became pretty clear.

> But as you say, in practice people are probably only interested in provid=
ing
> one value for the max speed / frequency.

OK. Thanks for your answers! Much appreciated.


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