Re: [PATCH for v4.9-stable] reset: make optional functions really optional

[Sasha Levin <sashal@kernel.org>]

On Mon, Dec 03, 2018 at 11:30:29AM -0600, Dinh Nguyen wrote:
>From: Ramiro Oliveira <Ramiro.Oliveira@synopsys.com>
>
>commit bb475230b8e59a547ab66ac3b02572df21a580e9 upstream.
>
>The *_get_optional_* functions weren't really optional so this patch
>makes them really optional.
>
>These *_get_optional_* functions will now return NULL instead of an error
>if no matching reset phandle is found in the DT, and all the
>reset_control_* functions now accept NULL rstc pointers.
>
>Signed-off-by: Ramiro Oliveira <Ramiro.Oliveira@synopsys.com>
>Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
>---
>Please apply to v4.9.y stable tree.

The original commit had a few upstream fixes:

bb6c7768385b reset: remove remaining WARN_ON() in <linux/reset.h>
1554bbd4ad40 reset: make device_reset_optional() really optional
62e24c5775ec reset: add exported __reset_control_get, return NULL if optional
0ca10b60ceeb reset: fix optional reset_control_get stubs to return NULL
4891486fb2c8 reset: core: fix reset_control_put

We'll need to backport them to 4.9 as well if you backport this commit.

--
Thanks,
Sasha