linux-kernel - Re: [PATCH 6/9] usb: cdns3: Added CDNS3_ID_PERIPHERAL and CDNS3_ID

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Date:   Tue, 7 Jul 2020 13:21:57 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Peter Chen <peter.chen@....com>
Cc:     Pawel Laszczak <pawell@...ence.com>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rogerq@...com" <rogerq@...com>,
        "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "colin.king@...onical.com" <colin.king@...onical.com>,
        "jpawar@...ence.com" <jpawar@...ence.com>,
        "ben.dooks@...ethink.co.uk" <ben.dooks@...ethink.co.uk>,
        "kurahul@...ence.com" <kurahul@...ence.com>,
        "sparmar@...ence.com" <sparmar@...ence.com>
Subject: Re: [PATCH 6/9] usb: cdns3: Added CDNS3_ID_PERIPHERAL and
 CDNS3_ID_HOST

On Tue, Jul 07, 2020 at 06:30:50AM +0000, Peter Chen wrote:
> On 20-07-01 08:20:01, Pawel Laszczak wrote:
> > Patch adds 2 definitions that make it easier to understand the code.
> > 
> > Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> > ---
> >  drivers/usb/cdns3/drd.c | 4 ++--
> >  drivers/usb/cdns3/drd.h | 3 +++
> >  2 files changed, 5 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c
> > index 6fe092c828b3..8e7673da905e 100644
> > --- a/drivers/usb/cdns3/drd.c
> > +++ b/drivers/usb/cdns3/drd.c
> > @@ -87,7 +87,7 @@ bool cdns3_is_host(struct cdns3 *cdns)
> >  {
> >  	if (cdns->dr_mode == USB_DR_MODE_HOST)
> >  		return true;
> > -	else if (!cdns3_get_id(cdns))
> > +	else if (cdns3_get_id(cdns) == CDNS3_ID_HOST)
> >  		return true;
> >  
> >  	return false;
> > @@ -98,7 +98,7 @@ bool cdns3_is_device(struct cdns3 *cdns)
> >  	if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL)
> >  		return true;
> >  	else if (cdns->dr_mode == USB_DR_MODE_OTG)
> > -		if (cdns3_get_id(cdns))
> > +		if (cdns3_get_id(cdns) == CDNS3_ID_PERIPHERAL)
> >  			return true;
> >  
> >  	return false;
> > diff --git a/drivers/usb/cdns3/drd.h b/drivers/usb/cdns3/drd.h
> > index 35b6d459ee58..3889fead9df1 100644
> > --- a/drivers/usb/cdns3/drd.h
> > +++ b/drivers/usb/cdns3/drd.h
> > @@ -153,6 +153,9 @@ struct cdns3_otg_common_regs {
> >  /* Only for CDNS3_CONTROLLER_V0 version */
> >  #define OVERRIDE_IDPULLUP_V0		BIT(24)
> >  
> > +#define CDNS3_ID_PERIPHERAL		1
> > +#define CDNS3_ID_HOST			0
> > +
> 
> Instead of adding MACRO, I prefer adding comments at the code to indicate
> "ID=0" means it is host mode, "ID=1" means it is device mode.

The comment can only be in one place but the macro can be used
everywhere and is immediately readable.  I suggested this patch, but now
that I see it I'm still surprised how much I like it.

regards,
dan carpenter