linux-kernel - Re: [PATCH v4 3/3] usb: chipidea: imx: Add binding to disable USB 60Mhz clock

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Message-ID: <20160921071945.GD23435@b29397-desktop>
Date:   Wed, 21 Sep 2016 15:19:46 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] usb: chipidea: imx: Add binding to disable USB
 60Mhz clock

On Mon, Sep 19, 2016 at 01:45:40PM +0200, Fabien Lahoudere wrote:
> This binding allow to disable the internal 60Mhz clock for USB host2 and
> host3.
> 
> Signed-off-by: Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
> ---
>  drivers/usb/chipidea/ci_hdrc_imx.c |  2 ++
>  drivers/usb/chipidea/ci_hdrc_imx.h |  1 +
>  drivers/usb/chipidea/usbmisc_imx.c | 13 +++++++++++++
>  3 files changed, 16 insertions(+)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
> index 96c0e33..89a9d98 100644
> --- a/drivers/usb/chipidea/ci_hdrc_imx.c
> +++ b/drivers/usb/chipidea/ci_hdrc_imx.c
> @@ -147,6 +147,8 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
>  	if (of_find_property(np, "external-vbus-divider", NULL))
>  		data->evdo = 1;
>  
> +	if (of_find_property(np, "disable-int60ck", NULL))
> +		data->disable_int60ck = 1;
>  
>  	if (of_usb_get_phy_mode(np) == USBPHY_INTERFACE_MODE_ULPI)
>  		data->ulpi = 1;
> diff --git a/drivers/usb/chipidea/ci_hdrc_imx.h b/drivers/usb/chipidea/ci_hdrc_imx.h
> index d666c9f..43bafae 100644
> --- a/drivers/usb/chipidea/ci_hdrc_imx.h
> +++ b/drivers/usb/chipidea/ci_hdrc_imx.h
> @@ -20,6 +20,7 @@ struct imx_usbmisc_data {
>  	unsigned int oc_polarity:1; /* over current polarity if oc enabled */
>  	unsigned int evdo:1; /* set external vbus divider option */
>  	unsigned int ulpi:1; /* connected to an ULPI phy */
> +	unsigned int disable_int60ck:1; /* disable 60 MHZ clock */
>  };
>  
>  int imx_usbmisc_init(struct imx_usbmisc_data *);
> diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
> index 11f51bd..a781f87 100644
> --- a/drivers/usb/chipidea/usbmisc_imx.c
> +++ b/drivers/usb/chipidea/usbmisc_imx.c
> @@ -53,6 +53,9 @@
>  #define MX53_USB_CTRL_1_H3_XCVR_CLK_SEL_ULPI BIT(6)
>  #define MX53_USB_UH2_CTRL_OFFSET	0x14
>  #define MX53_USB_UH3_CTRL_OFFSET	0x18
> +#define MX53_USB_CLKONOFF_CTRL_OFFSET	0x24
> +#define MX53_USB_CLKONOFF_CTRL_H2_INT60CKOFF BIT(21)
> +#define MX53_USB_CLKONOFF_CTRL_H3_INT60CKOFF BIT(22)
>  #define MX53_BM_OVER_CUR_DIS_H1		BIT(5)
>  #define MX53_BM_OVER_CUR_DIS_OTG	BIT(8)
>  #define MX53_BM_OVER_CUR_DIS_UHx	BIT(30)
> @@ -240,6 +243,11 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
>  				| MX53_USB_UHx_CTRL_ULPI_INT_EN;
>  			writel(val, reg);
>  		}
> +		if (data->disable_int60ck) {
> +			reg = usbmisc->base + MX53_USB_CLKONOFF_CTRL_OFFSET;
> +			val = readl(reg) | MX53_USB_CLKONOFF_CTRL_H2_INT60CKOFF;
> +			writel(val, reg);
> +		}
>  		if (data->disable_oc) {
>  			reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
>  			val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
> @@ -261,6 +269,11 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
>  				| MX53_USB_UHx_CTRL_ULPI_INT_EN;
>  			writel(val, reg);
>  		}
> +		if (data->disable_int60ck) {
> +			reg = usbmisc->base + MX53_USB_CLKONOFF_CTRL_OFFSET;
> +			val = readl(reg) | MX53_USB_CLKONOFF_CTRL_H3_INT60CKOFF;
> +			writel(val, reg);
> +		}
>  		if (data->disable_oc) {
>  			reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
>  			val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
> -- 
> 2.1.4
> 

Like I commented before, you need to have binding-doc update
(ocumentation/devicetree/bindings/usb/ci-hdrc-usb2.txt)
Besides, try to run ./scripts/get_maintainer.pl to get the
necessary maintainers and reviewers. You may get some
useful tips for reading Documentation/SubmittingPatches

-- 

Best Regards,
Peter Chen