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

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Date:   Fri, 3 Jun 2022 09:38:03 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     David Virag <virag.david003@...il.com>
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 03/06/2022 00:18, David Virag wrote:
> 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. 

Indeed, it's fine then. I'll check the bindings and convert them to DT
schema.


Best regards,
Krzysztof