linux-kernel - Re: [PATCH 5/5] arm64: dts: exynos: Add internal eMMC support to jackpotlte

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Date:   Fri, 03 Jun 2022 00:18:51 +0200
From:   David Virag <virag.david003@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     phone-devel@...r.kernel.org,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] arm64: dts: exynos: Add internal eMMC support to
 jackpotlte

On Thu, 2022-06-02 at 14:01 +0200, Krzysztof Kozlowski wrote:
> On 02/06/2022 01:37, David Virag wrote:
> > Add the nodes relevant to provide clocks for Exynos7885 eMMC and to
> > support eMMC. eMMC is the internal storage used in the Samsung
> > Galaxy A8
> > (2018) (jackpotlte), and all other known devices using the
> > Exynos7885
> > SoC.
> > 
> > Signed-off-by: David Virag <virag.david003@...il.com>
> > ---
> >  .../boot/dts/exynos/exynos7885-jackpotlte.dts | 20 ++++++++++++
> >  arch/arm64/boot/dts/exynos/exynos7885.dtsi    | 32
> > +++++++++++++++++++
> >  2 files changed, 52 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/exynos/exynos7885-jackpotlte.dts
> > b/arch/arm64/boot/dts/exynos/exynos7885-jackpotlte.dts
> > index 4cf9aa25f618..5db9a81ac7bb 100644
> > --- a/arch/arm64/boot/dts/exynos/exynos7885-jackpotlte.dts
> > +++ b/arch/arm64/boot/dts/exynos/exynos7885-jackpotlte.dts
> > @@ -60,6 +60,26 @@ power-key {
> >         };
> >  };
> >  
> > +&mmc_0 {
> > +       status = "okay";
> > +       mmc-hs200-1_8v;
> > +       mmc-hs400-1_8v;
> > +       cap-mmc-highspeed;
> > +       non-removable;
> > +       mmc-hs400-enhanced-strobe;
> > +       card-detect-delay = <200>;
> > +       clock-frequency = <800000000>;
> 
> Is this real property for MMC? Neither mmc nor DW MSHC bindings
> mention it.

It is, but I don't remember trying without it. Seems like it is not
documented then. It is used in dw_mmc.c in the following places:

https://github.com/torvalds/linux/blob/master/drivers/mmc/host/dw_mmc.c#L3242-L3243

https://github.com/torvalds/linux/blob/master/drivers/mmc/host/dw_mmc.c#L3306-L3325

The Exynos850 device tree has the same property in it's mmc node. 

> 
> Best regards,
> Krzysztof

Best regards,
David