Hi,
On Wednesday 06 April 2016 05:55 AM, Yoshihiro Shimoda wrote:
> Hi,
>
>> From: Kishon Vijay Abraham I
>> Sent: Tuesday, April 05, 2016 7:54 PM
>>
>> Hi,
>>
>> On Thursday 03 March 2016 03:39 PM, Yoshihiro Shimoda wrote:
>>> To handle the VBUS on/off by a regulator driver, this patch adds
>>> regulator APIs calling in the driver and description about vbus-supply
>>> in the rcar-gen3-phy-usb2.txt.
>>>
>>> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
>>> Acked-by: Rob Herring <r...@kernel.org>
>>> ---
>>> .../devicetree/bindings/phy/rcar-gen3-phy-usb2.txt | 2 ++
>>> drivers/phy/phy-rcar-gen3-usb2.c | 28
>>> ++++++++++++++++++++++
>>> 2 files changed, 30 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
>> b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
>>> index 86826ca..7243b3b 100644
>>> --- a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
>>> +++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
>>> @@ -21,6 +21,8 @@ To use a USB channel where USB 2.0 Host and HSUSB (USB
>>> 2.0 Peripheral) are
>>> combined, the device tree node should set interrupt properties to use the
>>> channel as USB OTG:
>>> - interrupts: interrupt specifier for the PHY.
>>> +- vbus-supply: Phandle to a regulator that provides power to the VBUS. This
>>> + regulator will be managed during the PHY power on/off sequence.
>>
>> Why not use phy-supply from the generic PHY binding? It can then be managed
>> by
>> the phy core during power_on/power_off.
>
> Thank you for the review!
>
> I'm afraid, I should have added your address as CC when I sent RFC patch set.
> Anyway, Rob had a comment about "phy-supply":
> http://thread.gmane.org/gmane.linux.kernel.renesas-soc/366/focus=406
>
> I agreed with Rob because the document mentioned the followings:
>
> Optional Properties:
> phy-supply: Phandle to a regulator that provides power to the PHY. This
> regulator will be managed during the PHY power on/off sequence.
>
> https://git.kernel.org/cgit/linux/kernel/git/kishon/linux-phy.git/tree/Documentation/devicetree/bindings/phy/phy-bindings.txt?h=next#n13
>
> And then, I changed the "phy-supply" to "vbus-supply" and this driver managed
> the "vbus-supply".
> Or, do I misunderstand the document?
All right. Will queue this for 4.7.
Thanks
Kishon
>
> Best regards,
> Yoshihiro Shimoda
>
>> Thanks
>> Kishon
>>
>>>
>>> Example (R-Car H3):
>>>
>>> diff --git a/drivers/phy/phy-rcar-gen3-usb2.c
>>> b/drivers/phy/phy-rcar-gen3-usb2.c
>>> index 3c647cd..7b14244 100644
>>> --- a/drivers/phy/phy-rcar-gen3-usb2.c
>>> +++ b/drivers/phy/phy-rcar-gen3-usb2.c
>>> @@ -19,6 +19,7 @@
>>> #include <linux/of_address.h>
>>> #include <linux/phy/phy.h>
>>> #include <linux/platform_device.h>
>>> +#include <linux/regulator/consumer.h>
>>>
>>> /******* USB2.0 Host registers (original offset is +0x200) *******/
>>> #define USB2_INT_ENABLE 0x000
>>> @@ -77,6 +78,7 @@
>>> struct rcar_gen3_chan {
>>> void __iomem *base;
>>> struct phy *phy;
>>> + struct regulator *vbus;
>>> bool has_otg;
>>> };
>>>
>>> @@ -210,6 +212,13 @@ static int rcar_gen3_phy_usb2_power_on(struct phy *p)
>>> struct rcar_gen3_chan *channel = phy_get_drvdata(p);
>>> void __iomem *usb2_base = channel->base;
>>> u32 val;
>>> + int ret;
>>> +
>>> + if (channel->vbus) {
>>> + ret = regulator_enable(channel->vbus);
>>> + if (ret)
>>> + return ret;
>>> + }
>>>
>>> val = readl(usb2_base + USB2_USBCTR);
>>> val |= USB2_USBCTR_PLL_RST;
>>> @@ -220,10 +229,22 @@ static int rcar_gen3_phy_usb2_power_on(struct phy *p)
>>> return 0;
>>> }
>>>
>>> +static int rcar_gen3_phy_usb2_power_off(struct phy *p)
>>> +{
>>> + struct rcar_gen3_chan *channel = phy_get_drvdata(p);
>>> + int ret = 0;
>>> +
>>> + if (channel->vbus)
>>> + ret = regulator_disable(channel->vbus);
>>> +
>>> + return ret;
>>> +}
>>> +
>>> static struct phy_ops rcar_gen3_phy_usb2_ops = {
>>> .init = rcar_gen3_phy_usb2_init,
>>> .exit = rcar_gen3_phy_usb2_exit,
>>> .power_on = rcar_gen3_phy_usb2_power_on,
>>> + .power_off = rcar_gen3_phy_usb2_power_off,
>>> .owner = THIS_MODULE,
>>> };
>>>
>>> @@ -290,6 +311,13 @@ static int rcar_gen3_phy_usb2_probe(struct
>>> platform_device *pdev)
>>> return PTR_ERR(channel->phy);
>>> }
>>>
>>> + channel->vbus = devm_regulator_get_optional(dev, "vbus");
>>> + if (IS_ERR(channel->vbus)) {
>>> + if (PTR_ERR(channel->vbus) == -EPROBE_DEFER)
>>> + return PTR_ERR(channel->vbus);
>>> + channel->vbus = NULL;
>>> + }
>>> +
>>> phy_set_drvdata(channel->phy, channel);
>>>
>>> provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
>>>
