linux-kernel - Re: [PATCH] phy: exynos5-usbdrd: Add facility to toggle vbus gpio on/off

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Message-ID: <53465FB9.7070002@ti.com>
Date:	Thu, 10 Apr 2014 14:39:13 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Vivek Gautam <gautam.vivek@...sung.com>,
	<linux-usb@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-doc@...r.kernel.org>
CC:	<gregkh@...uxfoundation.org>, <balbi@...com>,
	<kgene.kim@...sung.com>, <t.figa@...sung.com>,
	<k.debski@...sung.com>, <jg1.han@...sung.com>,
	<sylvester.nawrocki@...il.com>
Subject: Re: [PATCH] phy: exynos5-usbdrd: Add facility to toggle vbus gpio
 on/off

Hi.

On Wednesday 09 April 2014 05:24 PM, Vivek Gautam wrote:
> Adding support to enable/disable VBUS hooked to a gpio
> to enable vbus supply on the port.
> 
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> ---
> 
> Based on 'phy-exynos5-usbdrd' patches:
> [PATCH V4 0/5] Add Exynos5 USB 3.0 phy driver based on generic PHY framework
> http://www.spinics.net/lists/linux-usb/msg105507.html
> 
>  drivers/phy/phy-exynos5-usbdrd.c |   18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
> index ff54a7c..5ca7485 100644
> --- a/drivers/phy/phy-exynos5-usbdrd.c
> +++ b/drivers/phy/phy-exynos5-usbdrd.c
> @@ -18,6 +18,7 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_address.h>
> +#include <linux/of_gpio.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
>  #include <linux/mutex.h>
> @@ -176,6 +177,7 @@ struct exynos5_usbdrd_phy {
>  	struct clk *ref_clk;
>  	unsigned long ref_rate;
>  	unsigned int refclk_reg;
> +	int gpio;
>  };
>  
>  #define to_usbdrd_phy(inst) \
> @@ -460,6 +462,9 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy)
>  	if (!IS_ERR(phy_drd->usb30_sclk))
>  		clk_prepare_enable(phy_drd->usb30_sclk);
>  
> +	/* Toggle VBUS gpio - on */
> +	gpio_set_value(phy_drd->gpio, 1);
> +
>  	/* Power-on PHY*/
>  	inst->phy_cfg->phy_isol(inst, 0);
>  
> @@ -476,6 +481,9 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy)
>  	/* Power-off the PHY */
>  	inst->phy_cfg->phy_isol(inst, 1);
>  
> +	/* Toggle VBUS gpio - off */
> +	gpio_set_value(phy_drd->gpio, 0);
> +
>  	if (!IS_ERR(phy_drd->usb30_sclk))
>  		clk_disable_unprepare(phy_drd->usb30_sclk);
>  
> @@ -585,6 +593,16 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
>  
>  	phy_drd->drv_data = drv_data;
>  
> +	/* Get required GPIO for vbus */
> +	phy_drd->gpio = of_get_named_gpio(dev->of_node,
> +					  "samsung,vbus-gpio", 0);

Is this dt property documented somewhere?
> +	if (!gpio_is_valid(phy_drd->gpio))
> +		dev_dbg(dev, "no usbdrd-phy vbus gpio defined\n");

No return here? Can the PHY be functional even without the VBUS?

Thanks
Kishon
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