[PATCH v3 1/2] gpio: gpiolib: Generalise state persistence beyond sleep
ckeepax at opensource.cirrus.com
Wed Nov 1 21:09:53 AEDT 2017
On Wed, Nov 01, 2017 at 03:04:56PM +1100, Andrew Jeffery wrote:
> General support for state persistence is added to gpiolib with the
> introduction of a new pinconf parameter to propagate the request to
> hardware. The existing persistence support for sleep is adapted to
> include hardware support if the GPIO driver provides it. Persistence
> continues to be enabled by default; in-kernel consumers can opt out, but
> userspace (currently) does not have a choice.
> The *_SLEEP_MAY_LOSE_VALUE and *_SLEEP_MAINTAIN_VALUE symbols are
> renamed, dropping the SLEEP prefix to reflect that the concept is no
> longer sleep-specific. I feel that renaming to just *_MAY_LOSE_VALUE
> could initially be misinterpreted, so I've further changed the symbols
> to *_TRANSITORY and *_PERSISTENT to address this.
> The sysfs interface is modified only to keep consistency with the
> chardev interface in enforcing persistence for userspace exports.
> Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
Reviewed-by: Charles Keepax <ckeepax at opensource.cirrus.com>
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