netdev - Re: [PATCH net-next v3 03/19] net: ravb: Make reset controller support mandatory

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Date: Mon, 8 Jan 2024 09:05:56 +0200
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: s.shtylyov@....ru, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, richardcochran@...il.com,
 p.zabel@...gutronix.de, yoshihiro.shimoda.uh@...esas.com,
 wsa+renesas@...g-engineering.com, netdev@...r.kernel.org,
 linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
 geert+renesas@...der.be, Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH net-next v3 03/19] net: ravb: Make reset controller
 support mandatory

Hi, Geert,

On 05.01.2024 11:38, Geert Uytterhoeven wrote:
> Hi Claudiu,
> 
> On Fri, Jan 5, 2024 at 9:24 AM Claudiu <claudiu.beznea@...on.dev> wrote:
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> On the RZ/G3S SoC the reset controller is mandatory for the IP to work.
>> The device tree binding documentation for the ravb driver specifies that
>> the resets are mandatory. Based on this, make the resets mandatory also in
>> driver for all ravb devices.
>>
>> Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>
>> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
>> @@ -2645,7 +2645,7 @@ static int ravb_probe(struct platform_device *pdev)
>>                 return -EINVAL;
>>         }
>>
>> -       rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
>> +       rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
>>         if (IS_ERR(rstc))
>>                 return dev_err_probe(&pdev->dev, PTR_ERR(rstc),
>>                                      "failed to get cpg reset\n");
> 
> Upon second look, you also have to make config RAVB select
> RESET_CONTROLLER.
> Currently, you can build an R-Car Gen[234] kernel with RESET_CONTROLLER
> disabled, causing devm_reset_control_get_exclusive() to fail
> unconditionally.

ok, I'll update it. Thanks!

> 
> Gr{oetje,eeting}s,
> 
>                         Geert
>