Re: [PATCH v2 0/4] gpio: fix an incorrect lockdep warning

From: Bartosz Golaszewski
Date: Tue Sep 20 2016 - 08:32:33 EST

2016-09-20 13:30 GMT+02:00 Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>:
> On Tue, Sep 20, 2016 at 12:48 PM, Peter Rosin <peda@xxxxxxxxxx> wrote:
>> On 2016-09-20 12:07, Bartosz Golaszewski wrote:
>>> I feel like it's just wrong to set an arbitrary limit on the number of
>>> i2c branches - and this is what the result of this approach would be.
>> What arbitrary limit would that be? The number of lockdep classes
>> can't be *that* limited? Or?
>> I mean one lockdep class per root adapter and one subclass within that
>> class per mux level doesn't sound too bad. How many root adapters do
>> we need to design for?
> 'git grep -c i2c@ -- "*dts*"' told me exynos7 has 12 i2c interfaces.
> And as long as I have gpios (pcf8574?), I can add more using i2c-gpio.
> Hence the upper limit is infinity.

Agreed. If you add to that dynamic i2c adapters like hid-cp2112 or
greybus-i2c then it makes infinity plus some more.

Best regards,
Bartosz Golaszewski