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

On 02/05/2024 12:41, André Draszik wrote:

On Thu, 2024-05-02 at 09:46 +0200, Krzysztof Kozlowski wrote:

quoted

On 02/05/2024 09:41, Tudor Ambarus wrote:

quoted

quoted

@@ -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


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