linux-kernel - Re: at86rf230: Allow slow GPIO pins for "rstn"

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Date:   Wed, 21 Dec 2016 15:30:52 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     linux-wpan@...r.kernel.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Alexander Aring <aar@...gutronix.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chris Healy <cphealy@...il.com>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>
Subject: Re: at86rf230: Allow slow GPIO pins for "rstn"

> Driver code never touches "rstn" signal in atomic context, so there's
> no need to implicitly put such restriction on it by using gpio_set_value
> to manipulate it. Replace gpio_set_value to gpio_set_value_cansleep to
> fix that.
> 
> As a an example of where such restriction might be inconvenient,
> consider a hardware design where "rstn" is connected to a pin of I2C/SPI
> GPIO expander chip.
> 
> Cc: Chris Healy <cphealy@...il.com>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>

Reviewed-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>