linux-kernel - Re: [PATCH] mmc: sdhci-of-arasan: Add support to request the "gate" clock

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Message-ID: <CAPDyKFoJUS01wFVPbri05SdJa-Y5qhmBxWnnXFUGnsm+zCpUfw@mail.gmail.com>
Date:   Mon, 27 Feb 2023 16:31:30 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Michal Simek <michal.simek@....com>
Cc:     Swati Agarwal <swati.agarwal@....com>, adrian.hunter@...el.com,
        michal.simek@...inx.com, linux-mmc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        git@....com
Subject: Re: [PATCH] mmc: sdhci-of-arasan: Add support to request the "gate" clock

On Mon, 27 Feb 2023 at 16:09, Michal Simek <michal.simek@....com> wrote:
>
>
>
> On 2/27/23 15:56, Ulf Hansson wrote:
> > CAUTION: This message has originated from an External Source. Please use proper judgment and caution when opening attachments, clicking links, or responding to this email.
> >
> >
> > On Thu, 23 Feb 2023 at 15:14, Swati Agarwal <swati.agarwal@....com> wrote:
> >>
> >> Add support to read the optional "gate" clock property and request the
> >> clock which will be used to ungate the DLL clock.
> >>
> >> For Xilinx platforms which has DLL module, dll clock must be
> >> ungated/enabled when SD controller operates at higher frequencies like 50
> >> MHz, 100 MHz and 200 MHz. This will be done by explicitly requesting gate
> >> clock from the driver.
> >
> > I guess we need to update the DT bindings too?
>
> DT binding has it already. It is just not used.
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/mmc/arasan,sdhci.yaml?h=v6.2#n110

Aha, thanks for the pointer!

Kind regards
Uffe