linux-kernel - Re: [RESEND PATCH v2 2/2] usb: xhci-mtk: add an optional xhci

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Date:   Fri, 23 Aug 2019 09:43:42 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-usb@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: Re: [RESEND PATCH v2 2/2] usb: xhci-mtk: add an optional xhci_ck
 clock



On 23/08/2019 08:40, Chunfeng Yun wrote:
> Some SoCs may have an optional clock xhci_ck (125M or 200M), it
> usually uses the same PLL as sys_ck, so support it.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>

Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>

> ---
> v2 no changes
> ---
>  drivers/usb/host/xhci-mtk.c | 13 +++++++++++++
>  drivers/usb/host/xhci-mtk.h |  1 +
>  2 files changed, 14 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
> index 026fe18972d3..b18a6baef204 100644
> --- a/drivers/usb/host/xhci-mtk.c
> +++ b/drivers/usb/host/xhci-mtk.c
> @@ -216,6 +216,10 @@ static int xhci_mtk_clks_get(struct xhci_hcd_mtk *mtk)
>  		return PTR_ERR(mtk->sys_clk);
>  	}
>  
> +	mtk->xhci_clk = devm_clk_get_optional(dev, "xhci_ck");
> +	if (IS_ERR(mtk->xhci_clk))
> +		return PTR_ERR(mtk->xhci_clk);
> +
>  	mtk->ref_clk = devm_clk_get_optional(dev, "ref_ck");
>  	if (IS_ERR(mtk->ref_clk))
>  		return PTR_ERR(mtk->ref_clk);
> @@ -244,6 +248,12 @@ static int xhci_mtk_clks_enable(struct xhci_hcd_mtk *mtk)
>  		goto sys_clk_err;
>  	}
>  
> +	ret = clk_prepare_enable(mtk->xhci_clk);
> +	if (ret) {
> +		dev_err(mtk->dev, "failed to enable xhci_clk\n");
> +		goto xhci_clk_err;
> +	}
> +
>  	ret = clk_prepare_enable(mtk->mcu_clk);
>  	if (ret) {
>  		dev_err(mtk->dev, "failed to enable mcu_clk\n");
> @@ -261,6 +271,8 @@ static int xhci_mtk_clks_enable(struct xhci_hcd_mtk *mtk)
>  dma_clk_err:
>  	clk_disable_unprepare(mtk->mcu_clk);
>  mcu_clk_err:
> +	clk_disable_unprepare(mtk->xhci_clk);
> +xhci_clk_err:
>  	clk_disable_unprepare(mtk->sys_clk);
>  sys_clk_err:
>  	clk_disable_unprepare(mtk->ref_clk);
> @@ -272,6 +284,7 @@ static void xhci_mtk_clks_disable(struct xhci_hcd_mtk *mtk)
>  {
>  	clk_disable_unprepare(mtk->dma_clk);
>  	clk_disable_unprepare(mtk->mcu_clk);
> +	clk_disable_unprepare(mtk->xhci_clk);
>  	clk_disable_unprepare(mtk->sys_clk);
>  	clk_disable_unprepare(mtk->ref_clk);
>  }
> diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-mtk.h
> index 8be8c5f7ff62..5ac458b7d2e0 100644
> --- a/drivers/usb/host/xhci-mtk.h
> +++ b/drivers/usb/host/xhci-mtk.h
> @@ -139,6 +139,7 @@ struct xhci_hcd_mtk {
>  	struct regulator *vusb33;
>  	struct regulator *vbus;
>  	struct clk *sys_clk;	/* sys and mac clock */
> +	struct clk *xhci_clk;
>  	struct clk *ref_clk;
>  	struct clk *mcu_clk;
>  	struct clk *dma_clk;
>