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

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Message-ID: <6e037df0-8f59-9277-3f40-c22278e02430@amd.com>
Date:   Mon, 27 Feb 2023 16:09:42 +0100
From:   Michal Simek <michal.simek@....com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Swati Agarwal <swati.agarwal@....com>
CC:     <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 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

Thanks,
Michal