gpio-syscon for Keystone 2 - DT bindings mismatch code expectation?

gpio-syscon for Keystone 2 - DT bindings mismatch code expectation?

[Russell King - ARM Linux]

Linus, Grygorii,

I'm trying to understand what's happening to make Keystone2 print
this at boot:

gpio-syscon soc:keystone_dsp_gpio@02620240: can't read the dir register offset!
gpio-syscon soc:keystone_dsp_gpio@2620244: can't read the dir register offset!
gpio-syscon soc:keystone_dsp_gpio@2620248: can't read the dir register offset!
gpio-syscon soc:keystone_dsp_gpio@262024c: can't read the dir register offset!
gpio-syscon soc:keystone_dsp_gpio@2620250: can't read the dir register offset!
gpio-syscon soc:keystone_dsp_gpio@2620254: can't read the dir register offset!
gpio-syscon soc:keystone_dsp_gpio@2620258: can't read the dir register offset!
gpio-syscon soc:keystone_dsp_gpio@262025c: can't read the dir register offset!

>From what I can see in DT, these are defined as:

                dspgpio0: keystone_dsp_gpio@02620240 {
                        compatible = "ti,keystone-dsp-gpio";
                        gpio-controller;
                        #gpio-cells = <2>;
                        gpio,syscon-dev = <&devctrl 0x240>;
                };

However, the patch set which introduced the code included:

commit 5a3e3f88b0a10f8b5baf224ebda5916195fb8745
Author: Grygorii Strashko <grygorii.strashko-l0cyMroinI0@public.gmane.org>
Date:   Wed Sep 3 20:05:33 2014 +0300

    gpio: syscon: retrive syscon node and regs offsets from dt

which wants gpio,syscon-dev to contain a phandle and two offsets, not
a single offset.  Moreover, the following patch:

commit 2134cb997f2f1b2d960ad8705d67dc8d690ba59c
Author: Grygorii Strashko <grygorii.strashko-l0cyMroinI0@public.gmane.org>
Date:   Wed Sep 3 20:05:34 2014 +0300

    gpio: syscon: reuse for keystone 2 socs

added documentation which indicates that for keystone 2, only one
offset is necessary in gpio,syscon-dev, yet there is no "compatible"
string to stop the code requiring two offsets.

This looks like a complete trainwreck.  What's going on here?

Please can this get fixed... Thanks.

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Re: gpio-syscon for Keystone 2 - DT bindings mismatch code expectation?

[Linus Walleij]

On Mon, Mar 23, 2015 at 10:55 PM, Russell King - ARM Linux
<linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org> wrote:

> Linus, Grygorii,
>
> I'm trying to understand what's happening to make Keystone2 print
> this at boot:
>
> gpio-syscon soc:keystone_dsp_gpio@02620240: can't read the dir register offset!
> gpio-syscon soc:keystone_dsp_gpio@2620244: can't read the dir register offset!
> gpio-syscon soc:keystone_dsp_gpio@2620248: can't read the dir register offset!
> gpio-syscon soc:keystone_dsp_gpio@262024c: can't read the dir register offset!
> gpio-syscon soc:keystone_dsp_gpio@2620250: can't read the dir register offset!
> gpio-syscon soc:keystone_dsp_gpio@2620254: can't read the dir register offset!
> gpio-syscon soc:keystone_dsp_gpio@2620258: can't read the dir register offset!
> gpio-syscon soc:keystone_dsp_gpio@262025c: can't read the dir register offset!

Grygorii are you looking into this?

Yours,
Linus Walleij
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Re: gpio-syscon for Keystone 2 - DT bindings mismatch code expectation?

[Grygorii Strashko]

On 03/27/2015 12:12 PM, Linus Walleij wrote:
> On Mon, Mar 23, 2015 at 10:55 PM, Russell King - ARM Linux
> <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org> wrote:
>
>> Linus, Grygorii,
>>
>> I'm trying to understand what's happening to make Keystone2 print
>> this at boot:
>>
>> gpio-syscon soc:keystone_dsp_gpio@02620240: can't read the dir register offset!
>> gpio-syscon soc:keystone_dsp_gpio@2620244: can't read the dir register offset!
>> gpio-syscon soc:keystone_dsp_gpio@2620248: can't read the dir register offset!
>> gpio-syscon soc:keystone_dsp_gpio@262024c: can't read the dir register offset!
>> gpio-syscon soc:keystone_dsp_gpio@2620250: can't read the dir register offset!
>> gpio-syscon soc:keystone_dsp_gpio@2620254: can't read the dir register offset!
>> gpio-syscon soc:keystone_dsp_gpio@2620258: can't read the dir register offset!
>> gpio-syscon soc:keystone_dsp_gpio@262025c: can't read the dir register offset!
>
> Grygorii are you looking into this?

Yes. Seems you've found the patch already )
https://lkml.org/lkml/2015/3/24/908

regards,
-grygorii
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