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

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Date:	Mon, 14 Apr 2014 13:35:12 +0530
From:	Vivek Gautam <gautamvivek1987@...il.com>
To:	Felipe Balbi <balbi@...com>
Cc:	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-doc@...r.kernel.org, kishon <kishon@...com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Tomasz Figa <t.figa@...sung.com>,
	Kamil Debski <k.debski@...sung.com>,
	Jingoo Han <jg1.han@...sung.com>,
	Sylwester Nawrocki <sylvester.nawrocki@...il.com>
Subject: Re: [PATCH] phy: exynos5-usbdrd: Add facility to toggle vbus gpio on/off

Hi Felipe,


On Sat, Apr 12, 2014 at 9:07 AM, Felipe Balbi <balbi@...com> wrote:
> On Wed, Apr 09, 2014 at 05:24:45PM +0530, 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);
>
> It seems like you'd be better off using a regulator_enable() call for
> this.

Sure, i will use a regulator for this vbus settings.


-- 
Best Regards
Vivek Gautam
Samsung R&D Institute, Bangalore
India
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