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Message-ID: <qC9qbkh9nIk636ODaGapST9Je7Nb4JUB@localhost>
Date: Thu, 09 Jun 2022 18:45:21 +0100
From: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
To: Marc Zyngier <maz@...nel.org>
Cc: Paul Cercueil <paul@...pouillou.net>, linus.walleij@...aro.org,
linux-mips@...r.kernel.org, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: ingenic: Convert to immutable irq chip
Marc Zyngier <maz@...nel.org> writes:
> On 2022-06-09 11:00, Paul Cercueil wrote:
>> Hi Aidan,
>> Le mar., juin 7 2022 at 17:47:19 +0100, Aidan MacDonald
>> <aidanmacdonald.0x0@...il.com> a écrit :
>>> Paul Cercueil <paul@...pouillou.net> writes:
>>>
>>>> Hi Aidan,
>>>> Le mar., juin 7 2022 at 12:05:25 +0100, Aidan MacDonald
>>>> <aidanmacdonald.0x0@...il.com> a écrit :
>>>>> Update the driver to use an immutable IRQ chip to fix this warning:
>>>>> "not an immutable chip, please consider fixing it!"
>>>>> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
>>>>> ---
>>>>> drivers/pinctrl/pinctrl-ingenic.c | 33 ++++++++++++++++++-------------
>>>>> 1 file changed, 19 insertions(+), 14 deletions(-)
>>>>> diff --git a/drivers/pinctrl/pinctrl-ingenic.c
>>>>> b/drivers/pinctrl/pinctrl-ingenic.c
>>>>> index 1ca11616db74..37258fb05be3 100644
>>>>> --- a/drivers/pinctrl/pinctrl-ingenic.c
>>>>> +++ b/drivers/pinctrl/pinctrl-ingenic.c
>>>>> @@ -135,7 +135,6 @@ struct ingenic_pinctrl {
>>>>> struct ingenic_gpio_chip {
>>>>> struct ingenic_pinctrl *jzpc;
>>>>> struct gpio_chip gc;
>>>>> - struct irq_chip irq_chip;
>>>>> unsigned int irq, reg_base;
>>>>> };
>>>>> @@ -3419,6 +3418,8 @@ static void ingenic_gpio_irq_enable(struct irq_data
>>>>> *irqd)
>>>>> struct ingenic_gpio_chip *jzgc = gpiochip_get_data(gc);
>>>>> int irq = irqd->hwirq;
>>>>> + gpiochip_enable_irq(gc, irq);
>>>>> +
>>>>> if (is_soc_or_above(jzgc->jzpc, ID_JZ4770))
>>>>> ingenic_gpio_set_bit(jzgc, JZ4770_GPIO_INT, irq, true);
>>>>> else if (is_soc_or_above(jzgc->jzpc, ID_JZ4740))
>>>>> @@ -3443,6 +3444,8 @@ static void ingenic_gpio_irq_disable(struct
>>>>> irq_data
>>>>> *irqd)
>>>>> ingenic_gpio_set_bit(jzgc, JZ4740_GPIO_SELECT, irq, false);
>>>>> else
>>>>> ingenic_gpio_set_bit(jzgc, JZ4730_GPIO_GPIER, irq, false);
>>>>> +
>>>>> + gpiochip_disable_irq(gc, irq);
>>>>> }
>>>>> static void ingenic_gpio_irq_ack(struct irq_data *irqd)
>>>>> @@ -3684,6 +3687,20 @@ static void ingenic_gpio_irq_release(struct
>>>>> irq_data
>>>>> *data)
>>>>> return gpiochip_relres_irq(gpio_chip, data->hwirq);
>>>>> }
>>>>> +static const struct irq_chip ingenic_gpio_irqchip = {
>>>>> + .name = "gpio",
>>>>> + .irq_enable = ingenic_gpio_irq_enable,
>>>>> + .irq_disable = ingenic_gpio_irq_disable,
>>>>> + .irq_unmask = ingenic_gpio_irq_unmask,
>>>>> + .irq_mask = ingenic_gpio_irq_mask,
>>>>> + .irq_ack = ingenic_gpio_irq_ack,
>>>>> + .irq_set_type = ingenic_gpio_irq_set_type,
>>>>> + .irq_set_wake = ingenic_gpio_irq_set_wake,
>>>>> + .irq_request_resources = ingenic_gpio_irq_request,
>>>>> + .irq_release_resources = ingenic_gpio_irq_release,
>>>>> + .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
>>>>> +};
>>>>> +
>>>>> static int ingenic_pinmux_set_pin_fn(struct ingenic_pinctrl *jzpc,
>>>>> int pin, int func)
>>>>> {
>>>>> @@ -4172,20 +4189,8 @@ static int __init ingenic_gpio_probe(struct
>>>>> ingenic_pinctrl *jzpc,
>>>>> if (!jzgc->irq)
>>>>> return -EINVAL;
>>>>> - jzgc->irq_chip.name = jzgc->gc.label;
>>>>> - jzgc->irq_chip.irq_enable = ingenic_gpio_irq_enable;
>>>>> - jzgc->irq_chip.irq_disable = ingenic_gpio_irq_disable;
>>>>> - jzgc->irq_chip.irq_unmask = ingenic_gpio_irq_unmask;
>>>>> - jzgc->irq_chip.irq_mask = ingenic_gpio_irq_mask;
>>>>> - jzgc->irq_chip.irq_ack = ingenic_gpio_irq_ack;
>>>>> - jzgc->irq_chip.irq_set_type = ingenic_gpio_irq_set_type;
>>>>> - jzgc->irq_chip.irq_set_wake = ingenic_gpio_irq_set_wake;
>>>>> - jzgc->irq_chip.irq_request_resources = ingenic_gpio_irq_request;
>>>>> - jzgc->irq_chip.irq_release_resources = ingenic_gpio_irq_release;
>>>>> - jzgc->irq_chip.flags = IRQCHIP_MASK_ON_SUSPEND;
>>>>> -
>>>>> girq = &jzgc->gc.irq;
>>>>> - girq->chip = &jzgc->irq_chip;
>>>>> + gpio_irq_chip_set_chip(girq, &ingenic_gpio_irqchip);
>>>> This will change each irq_chip's name to "gpio", do we want that?
>>>> You didn't remove jzgc->irq_chip, so maybe what you could do is
>>>> jzgc->irq_chip = ingenic_gpio_irqchip;
>>>> jzgc->irq_chip.name = jzgc->gc.label;
>>>> gpio_irq_chip_set_chip(girq, &jzgc->irq_chip);
>>>> Thoughts?
>>>> Cheers,
>>>> -Paul
>>>>
>>> I wondered that myself, but it doesn't seem to affect anything except
>>> what is displayed in /proc/interrupts. Is the name used anywhere else
>>> where it might cause confusion?
>> I don't really know. If it only really affects the display in
>> /proc/interrupts then I'm fine with it. In doubt, I'd prefer to keep
>> the existing names.
>>
>>> The only similar case I could find was pinctrl-microchip-sgpio.c where
>>> microchip_sgpio_register_bank() is called in a loop and registers the
>>> same irq chip repeatedly, so it's probably(?) okay to do this here. It
>>> seems to defeat the point of immutable irqchips if they just have to be
>>> copied anyway...
>> The point of immutable irqchips is that they aren't modified by the
>> core, if I understand it correctly. Immutable doesn't mean it has to
>> be static const.
>
> I want these to be made const. I agree that the fancy string should
> be kept (sadly), as it is a userspace visible change, and we don't
> do that.
>
> You can solve it using the irq_print_chip() callback as part of
> your irq_chip structures. See 3344265a2692 for an example.
>
> Thanks,
>
> M.
Thanks for the tip! I'll do that and send a v2.
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