linux-kernel - Re: [PATCH 1/7] phy: exynos-usb2: add vbus regulator support

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Message-ID: <55D71D3E.3010807@ti.com>
Date:	Fri, 21 Aug 2015 18:14:46 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-samsung-soc@...r.kernel.org>
CC:	Robert Baldyga <r.baldyga@...sung.com>,
	John Youn <johnyoun@...opsys.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Kamil Debski <k.debski@...sung.com>
Subject: Re: [PATCH 1/7] phy: exynos-usb2: add vbus regulator support

Hi,

On Friday 21 August 2015 06:08 PM, Marek Szyprowski wrote:
> Exynos USB2 PHY has separate power supply, which is usually provided by
> VBUS regulator. This patch adds support for it. VBUS regulator is
> optional, to keep compatibility with boards, which have VBUS provided
> from some always-on power source.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>  .../devicetree/bindings/phy/samsung-phy.txt        |  3 +++
>  drivers/phy/phy-samsung-usb2.c                     | 25 ++++++++++++++++++++--
>  drivers/phy/phy-samsung-usb2.h                     |  2 ++
>  3 files changed, 28 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
> index 60c6f2a633e0..0289d3b07853 100644
> --- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
> @@ -44,6 +44,9 @@ Required properties:
>  	- the "ref" clock is used to get the rate of the clock provided to the
>  	  PHY module
>  
> +Optional properties:
> +- vbus-supply: power-supply phandle for vbus power source

how about using phy-supply?

Thanks
Kishon

> +
>  The first phandle argument in the PHY specifier identifies the PHY, its
>  meaning is compatible dependent. For the currently supported SoCs (Exynos 4210
>  and Exynos 4212) it is as follows:
> diff --git a/drivers/phy/phy-samsung-usb2.c b/drivers/phy/phy-samsung-usb2.c
> index f278a9c547e1..1d22d93b552d 100644
> --- a/drivers/phy/phy-samsung-usb2.c
> +++ b/drivers/phy/phy-samsung-usb2.c
> @@ -27,6 +27,13 @@ static int samsung_usb2_phy_power_on(struct phy *phy)
>  
>  	dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
>  		inst->cfg->label);
> +
> +	if (drv->vbus) {
> +		ret = regulator_enable(drv->vbus);
> +		if (ret)
> +			goto err_regulator;
> +	}
> +
>  	ret = clk_prepare_enable(drv->clk);
>  	if (ret)
>  		goto err_main_clk;
> @@ -48,6 +55,9 @@ err_power_on:
>  err_instance_clk:
>  	clk_disable_unprepare(drv->clk);
>  err_main_clk:
> +	if (drv->vbus)
> +		regulator_disable(drv->vbus);
> +err_regulator:
>  	return ret;
>  }
>  
> @@ -55,7 +65,7 @@ static int samsung_usb2_phy_power_off(struct phy *phy)
>  {
>  	struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
>  	struct samsung_usb2_phy_driver *drv = inst->drv;
> -	int ret;
> +	int ret = 0;
>  
>  	dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
>  		inst->cfg->label);
> @@ -68,7 +78,10 @@ static int samsung_usb2_phy_power_off(struct phy *phy)
>  	}
>  	clk_disable_unprepare(drv->ref_clk);
>  	clk_disable_unprepare(drv->clk);
> -	return 0;
> +	if (drv->vbus)
> +		ret = regulator_disable(drv->vbus);
> +
> +	return ret;
>  }
>  
>  static const struct phy_ops samsung_usb2_phy_ops = {
> @@ -203,6 +216,14 @@ static int samsung_usb2_phy_probe(struct platform_device *pdev)
>  			return ret;
>  	}
>  
> +	drv->vbus = devm_regulator_get(dev, "vbus");
> +	if (IS_ERR(drv->vbus)) {
> +		ret = PTR_ERR(drv->vbus);
> +		if (ret == -EPROBE_DEFER)
> +			return ret;
> +		drv->vbus = NULL;
> +	}
> +
>  	for (i = 0; i < drv->cfg->num_phys; i++) {
>  		char *label = drv->cfg->phys[i].label;
>  		struct samsung_usb2_phy_instance *p = &drv->instances[i];
> diff --git a/drivers/phy/phy-samsung-usb2.h b/drivers/phy/phy-samsung-usb2.h
> index 44bead9b8f34..6563e7ca0ac4 100644
> --- a/drivers/phy/phy-samsung-usb2.h
> +++ b/drivers/phy/phy-samsung-usb2.h
> @@ -17,6 +17,7 @@
>  #include <linux/device.h>
>  #include <linux/regmap.h>
>  #include <linux/spinlock.h>
> +#include <linux/regulator/consumer.h>
>  
>  #define KHZ 1000
>  #define MHZ (KHZ * KHZ)
> @@ -37,6 +38,7 @@ struct samsung_usb2_phy_driver {
>  	const struct samsung_usb2_phy_config *cfg;
>  	struct clk *clk;
>  	struct clk *ref_clk;
> +	struct regulator *vbus;
>  	unsigned long ref_rate;
>  	u32 ref_reg_val;
>  	struct device *dev;
> 
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