RE: [PATCH] arm64: dts: renesas: hihope-common: Add uSD and eMMC

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Hello Wolfram,

Thank you for the feedback!

> From: Wolfram Sang <wsa@xxxxxxxxxxxxx>
> Sent: 12 June 2019 10:45
> Subject: Re: [PATCH] arm64: dts: renesas: hihope-common: Add uSD and eMMC
> 
> 
> > I was thinking about sending a follow-up patch to list hs400 here
> > after Wolfram's patch appears in a RC, would that be okay with you?
> 
> Do we need that? The *board* does not handle HS400, so why add the
> property?

The SoC the design currently comes with doesn't handle HS400, but they may replace that
in the future with one that is based off R-Car M3-W version 3.0 (which does support HS400).
Also, the HiHope will come in two flavours, the HiHope RZ/G2M (the flavour we are currently
adding support for), and the HiHope RZ/G2N (sporting an RZ/G2N, which is based off R-Car M3-N).
File arch/arm64/boot/dts/renesas/hihope-common.dtsi contains common definitions for the
mother boards for both flavours (including the eMMC). My understanding is that R-Car M3-N does
support HS400, hence the need for the property here.

Thanks,
Fab

> 
> Similar setting would be an I2C device which can do 400kHz but the board
> layout doesn't allow for such speeds, so we are limited to 100kHz.
> 
> Or?





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