Re: [PATCH v3 2/2] pinctrl: samsung: support a bus clock

[Krzysztof Kozlowski <krzk@xxxxxxxxxx>]

On 02/05/2024 12:41, André Draszik wrote:
> On Thu, 2024-05-02 at 09:46 +0200, Krzysztof Kozlowski wrote:
>> On 02/05/2024 09:41, Tudor Ambarus wrote:
>>>>  
>>>> @@ -223,6 +268,13 @@ static void exynos_irq_release_resources(struct irq_data *irqd)
>>>>  	shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC];
>>>>  	mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1;
>>>>  
>>>> +	if (clk_enable(bank->drvdata->pclk)) {
>>>> +		dev_err(bank->gpio_chip.parent,
>>>> +			"unable to enable clock for deconfiguring pin %s-%lu\n",
>>>> +			bank->name, irqd->hwirq);
>>>> +		return;
>>>
>>> but here we just print an error. I guess that for consistency reasons it
>>> would be good to follow up with a patch and change the return types of
>>> these methods and return the error too when the clock enable fails.
>>
>> That's a release, so usually void callback. The true issue is that we
>> expect release to always succeed, I think.
>>
>> This points to issue with this patchset: looks like some patchwork all
>> around the places having register accesses. But how do you even expect
>> interrupts and pins to work if entire pinctrl block is clock gated?
> 
> I was initially thinking the same, but the clock seems to be required for
> register access only, interrupts are still being received and triggered
> with pclk turned off as per my testing.

Probably we could simplify this all and keep the clock enabled always,
when device is not suspended. Toggling clock on/off for every pin change
is also an overhead. Anyway, I merged the patches for now, because it
addresses real problem and seems like one of reasonable solutions.

Best regards,
Krzysztof