Re: [PATCH v4] usb: chipidea: removing of_find_property

Saurabh Sengar
2015-11-18T06:18:38Z

On 18 November 2015 at 11:35, Peter Chen <peter.chen@freescale.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@gmail.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.

Regards,
Saurabh