linux-kernel - Re: [PATCH v4 2/3] phy: rcar-gen3-usb2: change the mode to OTG on the combined channel

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Date:	Mon, 19 Oct 2015 18:50:48 +0700
From:	Khiem Nguyen <khiem.nguyen.xt@....renesas.com>
To:	Kishon Vijay Abraham I <kishon@...com>
CC:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	Toru Oishi <toru.oishi.zj@....renesas.com>
Subject: Re: [PATCH v4 2/3] phy: rcar-gen3-usb2: change the mode to OTG on
 the combined channel

Hi Kishon,

On 10/17/2015 8:48 AM, Kishon Vijay Abraham I wrote:
> Hi,
>
> On Tuesday 13 October 2015 03:52 PM, Yoshihiro Shimoda wrote:
>> To use the channel 0 of R-Car gen3 as periperal mode, This patch changes
>> the mode to OTG instead of HOST. Then, this driver needs to set some
>> registers to enable host mode and detects ID pin and VBUS pin at
>> phy_init() timing.
>>
>> For now, the channel 0 can be used as host mode only.
>>
>> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
>> ---
>>   drivers/phy/phy-rcar-gen3-usb2.c | 126 ++++++++++++++++++++++++++++++++++++++-
>>   1 file changed, 124 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/phy/phy-rcar-gen3-usb2.c b/drivers/phy/phy-rcar-gen3-usb2.c
>> index d90dfcf..03d7079 100644
>> --- a/drivers/phy/phy-rcar-gen3-usb2.c
>> +++ b/drivers/phy/phy-rcar-gen3-usb2.c

[ .... ] snip

>> +
>> +	dev_dbg(&ch->phy->dev, "%s: %08x, %d\n", __func__, tmp, host);
>
> This shoulod be dev_vdbg.

I guess using dev_dbg() is equivalent.

I searched in same directory (drivers/phy) and the number of drivers 
using dev_vdbg() are just few drivers. (in my search, only 3 drivers). 
Other drivers use dev_dbg().
The last driver using dev_dbg was from Jan 2015.
I also recognized that dev_vdbug was used mostly in USB drivers...

Is it your favorite way or is there any good point of using dev_vdbg() ?

>> +	if (host)
>> +		tmp &= ~USB2_COMMCTRL_OTG_PERI;
>> +	else
>> +		tmp |= USB2_COMMCTRL_OTG_PERI;
>> +	writel(tmp, usb2_base + USB2_COMMCTRL);
>> +}
>> +
>> +static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
>> +{
>> +	void __iomem *usb2_base = ch->usb2.base;
>> +	u32 tmp = readl(usb2_base + USB2_LINECTRL1);
>> +
>> +	dev_dbg(&ch->phy->dev, "%s: %08x, %d, %d\n", __func__, tmp, dp, dm);
>
> same here.

[.....] snip
>
> Thanks
> Kishon
> --
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