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

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Message-ID: <CAPDyKFoGmHpdt5UckyDTWQSK7OmZ789g9Owz7sPP4VJ6ezJbsQ@mail.gmail.com>
Date:   Mon, 27 Feb 2023 15:56:41 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     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 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?

Kind regards
Uffe

>
> Signed-off-by: Swati Agarwal <swati.agarwal@....com>
> ---
>  drivers/mmc/host/sdhci-of-arasan.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index 4eebbf801b41..1fd7528c14fc 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -1870,6 +1870,7 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>         int ret;
>         struct device_node *node;
>         struct clk *clk_xin;
> +       struct clk *clk_dll;
>         struct sdhci_host *host;
>         struct sdhci_pltfm_host *pltfm_host;
>         struct device *dev = &pdev->dev;
> @@ -1943,6 +1944,12 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>                 goto clk_dis_ahb;
>         }
>
> +       clk_dll = devm_clk_get_optional_enabled(dev, "gate");
> +       if (IS_ERR(clk_dll)) {
> +               ret = dev_err_probe(dev, PTR_ERR(clk_dll), "failed to get dll clk\n");
> +               goto clk_disable_all;
> +       }
> +
>         if (of_property_read_bool(np, "xlnx,fails-without-test-cd"))
>                 sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_FORCE_CDTEST;
>
> --
> 2.17.1
>