linux-kernel - Re: [PATCH 1/3] dt-bindings: mmc: meson-gx: add ddr-access-quirk property

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Date:   Wed, 15 May 2019 14:43:56 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Kevin Hilman <khilman@...libre.com>,
        DTML <devicetree@...r.kernel.org>,
        baylibre-upstreaming@...ups.io,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] dt-bindings: mmc: meson-gx: add ddr-access-quirk
 property

On 15/05/2019 13:37, Ulf Hansson wrote:
> On Mon, 13 May 2019 at 11:16, Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> On the Amlogic G12A SoC family, (only) the SDIO controller has a bug which
>> makes any DDR access from the MMC controller fail.
>>
>> Add the amlogic,ddr-access-quirk property so signal this particular
>> controller has this bug and needs a quirk to work properly.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>  Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt b/Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt
>> index 13e70409e8ac..f8914dab06c6 100644
>> --- a/Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt
>> +++ b/Documentation/devicetree/bindings/mmc/amlogic,meson-gx.txt
>> @@ -22,6 +22,10 @@ Required properties:
>>    clock rate requested by the MMC core.
>>  - resets     : phandle of the internal reset line
>>
>> +Optional properties:
>> +- amlogic,ddr-access-quirk: set when HW cannot access the DDR memory, like on
>> +  the G12A SDIO controller.
> 
> As stated on the other patch, may I suggest to use DRAM instead of DDR.

Indeed, may be more accurate.

> 
> Moreover, please mention that this is about the internal DMA support
> of the controller.

Ok

> 
>> +
>>  Example:
>>
>>         sd_emmc_a: mmc@...00 {
>> --
>> 2.21.0
>>
> 
> Kind regards
> Uffe
>