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List: linux-wpan
Subject: Re: [PATCH] at86rf230: Allow slow GPIO pins for "rstn"
From: Stefan Schmidt <stefan () osg ! samsung ! com>
Date: 2016-12-21 21:01:15
Message-ID: d1a4cfb5-9c0a-1bbe-1a5a-67f3f9e79d43 () osg ! samsung ! com
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Hello.
On 21/12/16 19:30, Chris Healy wrote:
>
>
> On Dec 21, 2016 5:11 AM, "Stefan Schmidt" <stefan@osg.samsung.com
> <mailto:stefan@osg.samsung.com>> wrote:
>
> Hello.
>
>
> On 19/12/16 00:25, Andrey Smirnov wrote:
>
> 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.
>
>
> We need to make sure we are not assuming it can be called in such a
> context in the future now. But that is something we can worry about
> if it comes up.
>
>
> 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.
>
>
> Is this a real life issue you run into?
>
>
> I have a platform with this configuration. The DTS for the platform is
> in the process of being mainlined right now.
Thanks for letting us know. What platform is that? I'm always interested
in hearing about devices that use the Linux ieee802154 subsystem. :)
regards
Stefan Schmidt
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