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

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Date:	Tue, 17 Nov 2015 11:20:11 +0000
From:	Måns Rullgård <mans@...sr.com>
To:	Saurabh Sengar <saurabh.truth@...il.com>
Cc:	Peter.Chen@...escale.com, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: chipidea: removing of_find_property

Saurabh Sengar <saurabh.truth@...il.com> writes:

> 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>
> ---
>  drivers/usb/chipidea/core.c | 67 ++++++++++++++++++++++-----------------------
>  1 file changed, 32 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index 965d0e2..8a4c22c 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -643,6 +643,7 @@ static int ci_get_platdata(struct device *dev,
>  	struct extcon_dev *ext_vbus, *ext_id;
>  	struct ci_hdrc_cable *cable;
>  	int ret;
> +	u32 pval;
>
>  	if (!platdata->phy_mode)
>  		platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
> @@ -688,52 +689,48 @@ 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",
> -				     &platdata->phy_clkgate_delay_us);
> +	if (!of_property_read_u32(dev->of_node, "phy-clkgate-delay-us",
> +				     &pval))
> +		platdata->phy_clkgate_delay_us = pval;

You don't need to use the pval temporary as of_property_read_u32 only
modifies the destination on success.

-- 
Måns Rullgård
mans@...sr.com
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