From: "Álvaro Fernández Rojas" <noltari@gmail.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Michael Walle <michael@walle.cc>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
Florian Fainelli <f.fainelli@gmail.com>,
bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>,
Jonas Gorski <jonas.gorski@gmail.com>,
Necip Fazil Yildiran <fazilyildiran@gmail.com>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
devicetree <devicetree@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v4 02/15] gpio: regmap: set gpio_chip of_node
Date: Fri, 5 Mar 2021 08:45:40 +0100 [thread overview]
Message-ID: <891B849E-32A0-4115-BCE9-2F0495274404@gmail.com> (raw)
In-Reply-To: <CAHp75VdJ0=EewuHW2Ja5MQ=e9q0njGun8iN5Q6JWUxe=CLB=MQ@mail.gmail.com>
Hi Andy,
> El 4 mar 2021, a las 17:33, Andy Shevchenko <andy.shevchenko@gmail.com> escribió:
>
> On Thu, Mar 4, 2021 at 5:44 PM Álvaro Fernández Rojas <noltari@gmail.com> wrote:
>>> El 4 mar 2021, a las 16:28, Andy Shevchenko <andy.shevchenko@gmail.com> escribió:
>>> On Thu, Mar 4, 2021 at 5:24 PM Álvaro Fernández Rojas <noltari@gmail.com> wrote:
>>>>> El 4 mar 2021, a las 16:17, Andy Shevchenko <andy.shevchenko@gmail.com> escribió:
>>>>> On Thu, Mar 4, 2021 at 5:06 PM Álvaro Fernández Rojas <noltari@gmail.com> wrote:
>>>>>>> El 4 mar 2021, a las 11:35, Andy Shevchenko <andy.shevchenko@gmail.com> escribió:
>>>>>>> On Thu, Mar 4, 2021 at 10:57 AM Álvaro Fernández Rojas
>>>>>>> <noltari@gmail.com> wrote:
>>>>>
>>>>>>>> + * @of_node: (Optional) The device node
>>>>>>>
>>>>>>>> + struct device_node *of_node;
>>>>>>>
>>>>>>> Can we use fwnode from day 1, please?
>>>>>>
>>>>>> Could you explain this? I haven’t dealt with fwnode never :$
>>>>>> BTW, this is done to fix this check when parsing gpio ranges:
>>>>>> https://github.com/torvalds/linux/blob/f69d02e37a85645aa90d18cacfff36dba370f797/drivers/gpio/gpiolib-of.c#L933-L934
>>>>>
>>>>> Use struct fwnode_handle pointer instead of OF-specific one.
>>>>
>>>> But is that compatible with the current gpiolib-of code? :$
>>>
>>> Yes (after a bit of amendment I have sent today as v2:
>>> https://lore.kernel.org/linux-gpio/20210304150215.80652-1-andriy.shevchenko@linux.intel.com/T/#u).
>>
>> Well that doesn’t fulfill my definition of “current gpiolib-of code”…
>> @Linus what should I do about this?
>
> Well, fwnode is a generic, and I strongly against spreading
> OF-specific code when we have fwnode working. But let's hear Linus
> out, of course!
>
> But it seems you are right and the library needs a few more amendments.
Yes, but I’m trying to do as few amendments as possible since I already have quite a large amount of patches :)
>
>>>>> Also here is the question, why do you need to have that field in the
>>>>> regmap config structure and can't simply use the parent's fwnode?
>>>>> Also I'm puzzled why it's not working w/o this patch: GPIO library
>>>>> effectively assigns parent's fwnode (okay, of_node right now).
>>>>
>>>> Because gpio regmap a child node of the pin controller, which is the one probed (gpio regmap is probed from the pin controller).
>>>> Therefore the parent’s fwnode is useless, since the correct gpio_chip node is the child's one (we have pin-ranges declared in the child node, referencing the parent pinctrl node).
>>>
>>> I see. Can you point me out to the code where we get the node and
>>> where it's being retrieved / filled?
>>
>> Sure, this is where the child node is searched: https://github.com/Noltari/linux/blob/6d1ebb8ff26ed54592eef1fcd3b58834acb48c04/drivers/pinctrl/bcm/pinctrl-bcm63xx.c#L100-L109
>> Then the gpio child node is probed and assigned here: https://github.com/Noltari/linux/blob/6d1ebb8ff26ed54592eef1fcd3b58834acb48c04/drivers/pinctrl/bcm/pinctrl-bcm63xx.c#L51
>
> So, this is not (*yet) in upstream, correct?
No it’s not, but I've already changed the approach several times and I’m starting to get tired about it...
>
> So, why not to switch to fwnode API in that driver as well?
>
> When you do that and supply fwnode thru the regmap configuration, in
> the gpio-regmap we may assign it to of_node (via to_of_node() API).
>
>> Basically, I based that part of the code on the ingenic pin controller: https://github.com/torvalds/linux/blob/f69d02e37a85645aa90d18cacfff36dba370f797/drivers/pinctrl/pinctrl-ingenic.c#L2485-L2491
>> https://github.com/torvalds/linux/blob/f69d02e37a85645aa90d18cacfff36dba370f797/Documentation/devicetree/bindings/pinctrl/ingenic%2Cpinctrl.yaml#L155-L176
>
> This doesn't use remgap GPIO.
Yes, I know, but there aren’t any pinctrl drivers using regmap GPIO right now, so I couldn’t base my code on anything else :)
>
> --
> With Best Regards,
> Andy Shevchenko
Best regards,
Álvaro.
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next prev parent reply other threads:[~2021-03-05 7:47 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-04 8:56 [PATCH v4 00/15] pinctrl: add BCM63XX pincontrol support Álvaro Fernández Rojas
2021-03-04 8:56 ` [PATCH v4 01/15] gpio: guard gpiochip_irqchip_add_domain() with GPIOLIB_IRQCHIP Álvaro Fernández Rojas
2021-03-04 10:33 ` Andy Shevchenko
2021-03-04 10:36 ` Álvaro Fernández Rojas
2021-03-09 16:20 ` Linus Walleij
2021-03-04 8:56 ` [PATCH v4 02/15] gpio: regmap: set gpio_chip of_node Álvaro Fernández Rojas
2021-03-04 10:35 ` Andy Shevchenko
2021-03-04 15:06 ` Álvaro Fernández Rojas
2021-03-04 15:17 ` Andy Shevchenko
2021-03-04 15:24 ` Álvaro Fernández Rojas
2021-03-04 15:28 ` Andy Shevchenko
2021-03-04 15:44 ` Álvaro Fernández Rojas
2021-03-04 16:33 ` Andy Shevchenko
2021-03-04 16:46 ` Andy Shevchenko
2021-03-04 17:24 ` Michael Walle
2021-03-05 9:44 ` Andy Shevchenko
2021-03-05 7:45 ` Álvaro Fernández Rojas [this message]
2021-03-05 9:49 ` Andy Shevchenko
2021-03-04 8:56 ` [PATCH v4 03/15] pinctrl: bcm: add bcm63xx base code Álvaro Fernández Rojas
2021-03-04 10:43 ` Andy Shevchenko
2021-03-04 11:17 ` Álvaro Fernández Rojas
2021-03-04 12:09 ` Andy Shevchenko
2021-03-04 12:28 ` Álvaro Fernández Rojas
2021-03-04 15:19 ` Andy Shevchenko
2021-03-04 8:56 ` [PATCH v4 04/15] Documentation: add BCM6328 pincontroller binding documentation Álvaro Fernández Rojas
2021-03-04 12:53 ` Michael Walle
2021-03-04 8:57 ` [PATCH v4 05/15] pinctrl: add a pincontrol driver for BCM6328 Álvaro Fernández Rojas
2021-03-04 10:49 ` Andy Shevchenko
2021-03-04 11:13 ` Álvaro Fernández Rojas
2021-03-04 12:12 ` Andy Shevchenko
2021-03-04 12:25 ` Álvaro Fernández Rojas
2021-03-04 15:25 ` Andy Shevchenko
2021-03-04 15:33 ` Álvaro Fernández Rojas
2021-03-04 15:36 ` Andy Shevchenko
2021-03-04 8:57 ` [PATCH v4 06/15] Documentation: add BCM6358 pincontroller binding documentation Álvaro Fernández Rojas
2021-03-04 8:57 ` [PATCH v4 07/15] pinctrl: add a pincontrol driver for BCM6358 Álvaro Fernández Rojas
2021-03-04 8:57 ` [PATCH v4 08/15] Documentation: add BCM6362 pincontroller binding documentation Álvaro Fernández Rojas
2021-03-04 8:57 ` [PATCH v4 09/15] pinctrl: add a pincontrol driver for BCM6362 Álvaro Fernández Rojas
2021-03-04 8:57 ` [PATCH v4 10/15] Documentation: add BCM6368 pincontroller binding documentation Álvaro Fernández Rojas
2021-03-04 8:57 ` [PATCH v4 11/15] pinctrl: add a pincontrol driver for BCM6368 Álvaro Fernández Rojas
2021-03-04 8:57 ` [PATCH v4 12/15] Documentation: add BCM63268 pincontroller binding documentation Álvaro Fernández Rojas
2021-03-04 8:57 ` [PATCH v4 13/15] pinctrl: add a pincontrol driver for BCM63268 Álvaro Fernández Rojas
2021-03-04 8:57 ` [PATCH v4 14/15] Documentation: add BCM6318 pincontroller binding documentation Álvaro Fernández Rojas
2021-03-04 8:57 ` [PATCH v4 15/15] pinctrl: add a pincontrol driver for BCM6318 Álvaro Fernández Rojas
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