Quoting Andy Shevchenko (2018-03-21 10:59:10)

On Wed, 2018-03-21 at 09:58 -0700, Stephen Boyd wrote:

quoted

From: Stephen Boyd <redacted>

Some qcom platforms make some GPIOs or pins unavailable for use by
non-secure operating systems, and thus reading or writing the
registers
for those pins will cause access control issues. Add support for a DT
property to describe the set of GPIOs that are available for use so
that
higher level OSes are able to know what pins to avoid reading/writing.
Non-DT platforms can add support by directly updating the
chip->valid_mask.

quoted

Signed-off-by: Stephen Boyd <redacted>
Signed-off-by: Stephen Boyd <redacted>

Hmm...

Don't look closely! :P

quoted

+     gpiochip->valid_mask = kcalloc(BITS_TO_LONGS(gpiochip-

quoted

ngpio),

+                                    sizeof(long), GFP_KERNEL);

Just noticed that kcalloc is superfluous here.
kmalloc_array() would be enough.

Ok. I was copying the irqchip style. Should I fold them together into a
helper function and also update to kmalloc_array?