Le 2017-02-20 14:56, Linus Walleij a écrit :
On Thu, Feb 9, 2017 at 6:28 PM, Paul Cercueil [off-list ref]
wrote:
quoted
I was thinking that instead of having one pinctrl-ingenic instance
covering
0x600 of register space, and 6 instances of gpio-ingenic having 0x100
each,
I could just have 6 instances of pinctrl-ingenic, each one with an
instance
of gpio-ingenic declared as a sub-node, each handling just 0x100 of
memory
space.
My head is spinning, but I think I get it. What is wrong with the
solution
I proposed with one pin control instance covering the whole 0x600 and
with 6
subnodes of GPIO?
The GPIO nodes do not even have to have an address range associated
with
them you know, that can be distributed out with regmap code accessing
the parent regmap.
OK, but then each GPIO chip 'X' still need to know its offset in the
register
area, which is (pinctrl_base + X * 0x100).
What's the best way to pass that info to the driver? (I assume it's not
with
a custom DT binding...).
Regards,
-Paul