linux-kernel - Re: [PATCH 1/2] arm64: dts: rockchip: Add enable-strobe-pulldown to emmc phy on ROCK Pi 4

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Date: Thu, 28 Mar 2024 07:08:20 +0000
From: "Folker Schwesinger" <dev@...ker-schwesinger.de>
To: <wens@...nel.org>
Cc: "Vinod Koul" <vkoul@...nel.org>, "Yogesh Hegde" <yogi.kernel@...il.com>,
 "Heiko Stuebner" <heiko@...ech.de>, "Chris Ruehl"
 <chris.ruehl@...ys.com.hk>, "Rob Herring" <robh@...nel.org>, "Krzysztof
 Kozlowski" <krzysztof.kozlowski+dt@...aro.org>, "Conor Dooley"
 <conor+dt@...nel.org>, "Dragan Simic" <dsimic@...jaro.org>, "Christopher
 Obbard" <chris.obbard@...labora.com>,
 <linux-arm-kernel@...ts.infradead.org>,
 <linux-rockchip@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
 <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] arm64: dts: rockchip: Add enable-strobe-pulldown to
 emmc phy on ROCK Pi 4

On Thu Mar 28, 2024 at 6:39 AM CET, Chen-Yu Tsai wrote:
> > @@ -648,7 +649,8 @@ &saradc {
> >  &sdhci {
> >         max-frequency = <150000000>;
> >         bus-width = <8>;
> > -       mmc-hs200-1_8v;
>
> Shouldn't this be kept around? The node should list all supported modes,
> not just the highest one. Same for the other patch.
>

This is not necessary, mmc-hs400-1_8v implicitly activates the
corresponding HS200 capability, see drivers/mmc/core/host.c:

if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
	host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
/* ... */
if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
	host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;

Kind regards

Folker


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