linux-kernel - Re: [PATCH net-next v3 1/4] phylib: Add device reset delay support

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Date:   Tue, 5 Dec 2017 19:06:36 +0100
From:   Richard Leitner <richard.leitner@...data.com>
To:     Andrew Lunn <andrew@...n.ch>, Richard Leitner <dev@...l1n.net>
CC:     <robh+dt@...nel.org>, <mark.rutland@....com>,
        <fugang.duan@....com>, <f.fainelli@...il.com>,
        <frowand.list@...il.com>, <davem@...emloft.net>,
        <geert+renesas@...der.be>, <sergei.shtylyov@...entembedded.com>,
        <baruch@...s.co.il>, <david.wu@...k-chips.com>, <lukma@...x.de>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v3 1/4] phylib: Add device reset delay support

Hi Andrew,

On 12/05/2017 06:28 PM, Andrew Lunn wrote:
> Hi Richard
> 
>> +++ b/drivers/of/of_mdio.c
>> @@ -77,6 +77,14 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio,
>>   	if (of_property_read_bool(child, "broken-turn-around"))
>>   		mdio->phy_ignore_ta_mask |= 1 << addr;
>>   
>> +	if (of_property_read_u32(child, "reset-delay-us",
>> +				 &phy->mdio.reset_delay))
>> +		phy->mdio.reset_delay = 0;
>> +
>> +	if (of_property_read_u32(child, "reset-post-delay-us",
>> +				 &phy->mdio.reset_post_delay))
>> +		phy->mdio.reset_post_delay = 0;
> 
> of_property_read_u32() should not change the variable you pass to it,
> if it does not find the property. So you can change this to:
> 
> 	phy->mdio.reset_delay = 0;
> 	phy->mdio.reset_post_delay = 0;
> 
> 	of_property_read_u32(child, "reset-delay-us",
> 			     &phy->mdio.reset_delay);
> 
> 	of_property_read_u32(child, "reset-post-delay-us",
> 			     &phy->mdio.reset_post_delay);

Geert already pointed this out, but he said it's possible to omit also 
the zeroing of the variables.

 > On 12/05/2017 02:54 PM, Geert Uytterhoeven wrote:
 >> If of_property_read_u32() fails, it doesn't write to its output
 >> parameter.
 >> As the structure should be zeroed during allocation, you can just
 >> write:
 >>
 >> of_property_read_u32(child, "reset-delay-us",&phy->mdio.reset_delay);
 >> of_property_read_u32(child, "reset-post-delay-us",
 >>                      &phy->mdio.reset_post_delay);

If that's ok I'll take the shorter (Geerts) suggestion for v4.

Nonetheless thanks for your quick feedback!

regards;Richard.L