Re: [RFC PATCH 3/3] ARM: at91/dt: move sama5 to generic pinconf

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Hello Linus,

On 28/08/2013 14:28, Linus Walleij wrote:
On Sat, Aug 24, 2013 at 11:40 PM, Boris BREZILLON
<b.brezillon@xxxxxxxxxxx> wrote:

Add generic pinconf definitions and reference appropriate configs in
atmel,pins properties.

Signed-off-by: Boris BREZILLON <b.brezillon@xxxxxxxxxxx>
(...)
                         pinctrl@fffff200 {
                                 #address-cells = <1>;
                                 #size-cells = <1>;
-                               compatible = "atmel,at91sam9x5-pinctrl", "atmel,at91rm9200-pinctrl", "simple-bus";
+                               compatible = "atmel,at91sam9x5-pinctrl", "atmel,at91rm9200-pinctrl", "generic-pinconf", "simple-bus";
What kind of compatible string is that "generic-pinconf"?

There is no driver that can instantiate against this string but I'm not
100% sure about such things. Is there some other driver doing this?

Else I think it'd just be removed.

It did not exist before this patch series.

I thought it would be good idea to add a compatible string to tell if the pinctrl subnodes support the generic-pinconf binding,
without modifying the current compatible strings:
if compatible string contains the "generic-pinconf" then the pinconf definitions should be considered generic.

However, after discussing it with Stephen, Jean-Christophe and Nicolas, I no longer think this is a good idea
(backward compatibility issues).




+                               pcfg_none: pcfg_none {
+                                       bias-disable;
+                               };
+
+                               pcfg_pull_up: pcfg_pull_up {
+                                       bias-pull-up;
+                               };
Nice.

+                               pcfg_deglitch: pcfg_deglitch {
+                                       input-deglitch = <1>;
+                               };
+
+                               pcfg_pull_up_deglitch: pcfg_pull_up_deglitch {
+                                       bias-pull-up;
+                                       input-deglitch = <1>;
+                               };
input-deglitch seems like a proposed generic binding but I haven't seen
these yet?
(It might be in my violently exploding INBOX though sorry in that case.)

This would need adding to
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
Plus changes to pinctrl core for handling.

This was added in the first patch of this series:
https://lkml.org/lkml/2013/8/24/99

BTW: this is really moving in the right direction!

Yours,
Linus Walleij

Thanks.

Best Regards,

Boris
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