linux-kernel - Re: [PATCH RESEND v4 4/8] phy: usb: sunxi: Introduce Allwinner A31 USB PHY support

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Date:	Wed, 14 May 2014 14:09:37 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Emilio Lopez <emilio@...pez.com.ar>,
	Mike Turquette <mturquette@...aro.org>,
	<stern@...land.harvard.edu>, <hdegoede@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Boris Brezillon <boris@...e-electrons.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <kevin.z.m.zh@...il.com>,
	<sunny@...winnertech.com>, <shuge@...winnertech.com>,
	<zhuzhenhua@...winnertech.com>, <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH RESEND v4 4/8] phy: usb: sunxi: Introduce Allwinner A31
 USB PHY support

Hi,

On Tuesday 13 May 2014 09:14 PM, Maxime Ripard wrote:
> The USB phy controller in the A31 differs mostly from the older controllers
> because it has a clock dedicated for each phy, while the older ones were having
> a single clock for all the phys.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> ---
>  drivers/phy/phy-sun4i-usb.c | 33 ++++++++++++++++++++++-----------
>  1 file changed, 22 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
> index 66a87d50512b..115d8d5190d5 100644
> --- a/drivers/phy/phy-sun4i-usb.c
> +++ b/drivers/phy/phy-sun4i-usb.c
> @@ -61,7 +61,6 @@
>  #define MAX_PHYS			3
>  
>  struct sun4i_usb_phy_data {
> -	struct clk *clk;
>  	void __iomem *base;
>  	struct mutex mutex;
>  	int num_phys;
> @@ -71,6 +70,7 @@ struct sun4i_usb_phy_data {
>  		void __iomem *pmu;
>  		struct regulator *vbus;
>  		struct reset_control *reset;
> +		struct clk *clk;
>  		int index;
>  	} phys[MAX_PHYS];
>  };
> @@ -146,13 +146,13 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>  	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
>  	int ret;
>  
> -	ret = clk_prepare_enable(data->clk);
> +	ret = clk_prepare_enable(phy->clk);
>  	if (ret)
>  		return ret;
>  
>  	ret = reset_control_deassert(phy->reset);
>  	if (ret) {
> -		clk_disable_unprepare(data->clk);
> +		clk_disable_unprepare(phy->clk);
>  		return ret;
>  	}
>  
> @@ -170,11 +170,10 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>  static int sun4i_usb_phy_exit(struct phy *_phy)
>  {
>  	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
> -	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
>  
>  	sun4i_usb_phy_passby(phy, 0);
>  	reset_control_assert(phy->reset);
> -	clk_disable_unprepare(data->clk);
> +	clk_disable_unprepare(phy->clk);
>  
>  	return 0;
>  }
> @@ -225,6 +224,7 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct device_node *np = dev->of_node;
>  	struct phy_provider *phy_provider;
> +	bool dedicated_clocks;
>  	struct resource *res;
>  	int i;
>  
> @@ -244,17 +244,16 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>  	else
>  		data->disc_thresh = 2;
>  
> +	if (of_device_is_compatible(np, "allwinner,sun6i-a31-usb-phy"))
> +		dedicated_clocks = true;
> +	else
> +		dedicated_clocks = false;
> +
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
>  	data->base = devm_ioremap_resource(dev, res);
>  	if (IS_ERR(data->base))
>  		return PTR_ERR(data->base);
>  
> -	data->clk = devm_clk_get(dev, "usb_phy");
> -	if (IS_ERR(data->clk)) {
> -		dev_err(dev, "could not get usb_phy clock\n");
> -		return PTR_ERR(data->clk);
> -	}
> -
>  	/* Skip 0, 0 is the phy for otg which is not yet supported. */
>  	for (i = 1; i < data->num_phys; i++) {
>  		struct sun4i_usb_phy *phy = data->phys + i;
> @@ -268,6 +267,17 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>  			phy->vbus = NULL;
>  		}
>  
> +		if (dedicated_clocks)
> +			snprintf(name, sizeof(name), "usb%d_phy", i);
> +		else
> +			strlcpy(name, "usb_phy", sizeof(name));
> +
> +		phy->clk = devm_clk_get(dev, name);
> +		if (IS_ERR(phy->clk)) {
> +			dev_err(dev, "failed to get clock %s\n", name);
> +			return PTR_ERR(phy->clk);
> +		}
> +
>  		snprintf(name, sizeof(name), "usb%d_reset", i);
>  		phy->reset = devm_reset_control_get(dev, name);
>  		if (IS_ERR(phy->reset)) {
> @@ -305,6 +315,7 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>  static const struct of_device_id sun4i_usb_phy_of_match[] = {
>  	{ .compatible = "allwinner,sun4i-a10-usb-phy" },
>  	{ .compatible = "allwinner,sun5i-a13-usb-phy" },
> +	{ .compatible = "allwinner,sun6i-a31-usb-phy" },

Do you have Documentation for this comptible binding? Would be good to mention
that in the commit log.

Thanks
Kishon
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