linux-kernel - Re: [PATCH v4] usb: chipidea: removing of_find

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Message-ID: <20151118072438.GE4228@shlinux2>
Date:	Wed, 18 Nov 2015 15:24:39 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Saurabh Sengar <saurabh.truth@...il.com>
CC:	Måns Rullgård <mans@...sr.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] usb: chipidea: removing of_find_property

On Wed, Nov 18, 2015 at 11:48:36AM +0530, Saurabh Sengar wrote:
> On 18 November 2015 at 11:35, Peter Chen <peter.chen@...escale.com> wrote:
> > On Wed, Nov 18, 2015 at 09:40:12AM +0530, Saurabh Sengar wrote:
> >> call to of_find_property() before of_property_read_u32() is unnecessary.
> >> of_property_read_u32() anyway calls to of_find_property() only.
> >>
> >> Signed-off-by: Saurabh Sengar <saurabh.truth@...il.com>
> >> ---
> >> v4 : removed return type check for optional property 'itc-setting'
> >>
> >>  drivers/usb/chipidea/core.c | 57 +++++++++++++++++----------------------------
> >>  1 file changed, 22 insertions(+), 35 deletions(-)
> >>
> >> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> >> index 965d0e2..3d1c3c5 100644
> >> --- a/drivers/usb/chipidea/core.c
> >> +++ b/drivers/usb/chipidea/core.c
> >> @@ -688,52 +688,39 @@ static int ci_get_platdata(struct device *dev,
> >>       if (usb_get_maximum_speed(dev) == USB_SPEED_FULL)
> >>               platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
> >>
> >> -     if (of_find_property(dev->of_node, "phy-clkgate-delay-us", NULL))
> >> -             of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
> >> +     of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
> >>                                    &platdata->phy_clkgate_delay_us);
> >>
> >>       platdata->itc_setting = 1;
> >> -     if (of_find_property(dev->of_node, "itc-setting", NULL)) {
> >> -             ret = of_property_read_u32(dev->of_node, "itc-setting",
> >> -                     &platdata->itc_setting);
> >> -             if (ret) {
> >> -                     dev_err(dev,
> >> -                             "failed to get itc-setting\n");
> >> -                     return ret;
> >> -             }
> >> -     }
> >>
> >> -     if (of_find_property(dev->of_node, "ahb-burst-config", NULL)) {
> >> -             ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
> >> -                     &platdata->ahb_burst_config);
> >> -             if (ret) {
> >> -                     dev_err(dev,
> >> -                             "failed to get ahb-burst-config\n");
> >> -                     return ret;
> >> -             }
> >> +     of_property_read_u32(dev->of_node, "itc-setting",
> >> +                                     &platdata->itc_setting);
> >> +
> >> +     ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
> >> +                             &platdata->ahb_burst_config);
> >> +     if (!ret) {
> >>               platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
> >> +     } else if (ret != -EINVAL) {
> >> +             dev_err(dev, "failed to get ahb-burst-config\n");
> >> +             return ret;
> >>       }
> 
> >Sorry, one more comment, why we don't quit if the 'ret' is other error
> >value?
> >
> > Peter
> 
> We quit if error is anything other then -EINVAL.
> In case of -EINVAL, it means we are deliberating ignoring that
> property thus left it.
> Also the previous functionality was like this when we were using
> of_find_property().
> Please let me know if this need to be changed, that we need to return
> in all kind of error, I will fix it and send it in patch v5.
> 

I am clear now, I will queue it.

-- 

Best Regards,
Peter Chen
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