linux-kernel - Re: [PATCH] serial: 8250

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Message-ID: <CACPK8Xc_JOGJRF6-w9XrBGuaYist9y1d=RroiJWxc9wJAtoySg@mail.gmail.com>
Date:   Fri, 26 May 2017 11:54:26 +1000
From:   Joel Stanley <joel@....id.au>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-serial@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] serial: 8250_of: Add reset support

On Wed, May 24, 2017 at 6:18 PM, Philipp Zabel <p.zabel@...gutronix.de> wrote:
> Hi Joel,
>
> On Wed, 2017-05-24 at 14:53 +1000, Joel Stanley wrote:
>> @@ -132,6 +134,18 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
>>               }
>>       }
>>
>> +     info->rst = devm_reset_control_get_optional(&ofdev->dev, NULL);
>
> Please use devm_reset_control_get_optional_shared instead.
>
> This looks like shared (clock-like) reset use, where you just have to
> make sure that the reset is deasserted while the module is in use, but
> you don't care whether it is actually asserted all the time otherwise.

Thanks for the review. The new reset API is much nicer, and it worked
for me once I realised the changes came in for 4.11 (my test setup is
based on 4.10).

Cheers,

Joel