[PATCH 0/2] pinctrl: sx150x: set multiple pins at once

From: Peter Rosin
Date: Tue Nov 22 2016 - 11:22:16 EST


I have only tested this on an 8-bit sx1502, so I'm uncertain if
the there needs to be locking for this to work as intended for
the bigger chips with an oscio pin? Probably.

So, I didn't add (or rather, removed) these lines at the end of
sx150x_gpio_set_multiple() and made the op optional instead.

if (*mask & pctl->oscio_mask)
sx150x_gpio_oscio_set(pctl, *bits & pctl->oscio_mask);

I mean, what happens if there are two users writing multiple pins
where one of the pins is the oscio pin, and this happens concurrently?
I get the feeling that there is nothing stopping interleaving in that
case, and you could end up with the desired values from user 1 for the
normal pins, and the desired value for the oscio pin from user 2.

But for the easy case (no oscio) where the existing regmap locking
holds, this is a nice speedup and desired behaviour without a lot
of individual pin changes.


Peter Rosin (2):
pinctrl: sx150x: various spelling fixes and some white-space cleanup
pinctrl: sx150x: support setting multiple pins at once

drivers/pinctrl/pinctrl-sx150x.c | 50 ++++++++++++++++++++++++++++------------
1 file changed, 35 insertions(+), 15 deletions(-)