linux-kernel - Re: [PATCH 3/4] soc: fsl: qe: Add support of IRQ in QE GPIO

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Message-ID: <d085efdd-fe8b-4efa-92e1-34573c55ade5@csgroup.eu>
Date: Mon, 18 Aug 2025 10:33:06 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
 linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
 devicetree@...r.kernel.org, Qiang Zhao <qiang.zhao@....com>,
 Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH 3/4] soc: fsl: qe: Add support of IRQ in QE GPIO



Le 12/08/2025 à 16:21, Bartosz Golaszewski a écrit :
> On Tue, 12 Aug 2025 13:02:53 +0200, Christophe Leroy
> <christophe.leroy@...roup.eu> said:
>> In the QE, a few GPIOs are IRQ capable. Similarly to
>> commit 726bd223105c ("powerpc/8xx: Adding support of IRQ in MPC8xx
>> GPIO"), add IRQ support to QE GPIO.
>>
>> Add property 'fsl,qe-gpio-irq-mask' similar to
>> 'fsl,cpm1-gpio-irq-mask' that define which of the GPIOs have IRQs.
>>
>> Here is an exemple for port B of mpc8323 which has IRQs for
>> GPIOs PB7, PB9, PB25 and PB27.
>>
>> 	qe_pio_b: gpio-controller@...8 {
>> 		#gpio-cells = <2>;
>> 		compatible = "fsl,mpc8323-qe-pario-bank";
>> 		reg = <0x1418 0x18>;
>> 		interrupts = <4 5 6 7>;
>> 		fsl,qe-gpio-irq-mask = <0x01400050>;
>> 		interrupt-parent = <&qepic>;
>> 		gpio-controller;
>> 	};
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
>> ---
>>   drivers/soc/fsl/qe/gpio.c | 20 ++++++++++++++++++++
>>   1 file changed, 20 insertions(+)
>>
>> diff --git a/drivers/soc/fsl/qe/gpio.c b/drivers/soc/fsl/qe/gpio.c
>> index b502377193192..59145652ad850 100644
>> --- a/drivers/soc/fsl/qe/gpio.c
>> +++ b/drivers/soc/fsl/qe/gpio.c
>> @@ -13,6 +13,7 @@
>>   #include <linux/err.h>
>>   #include <linux/io.h>
>>   #include <linux/of.h>
>> +#include <linux/of_irq.h>
>>   #include <linux/gpio/legacy-of-mm-gpiochip.h>
>>   #include <linux/gpio/consumer.h>
>>   #include <linux/gpio/driver.h>
>> @@ -32,6 +33,8 @@ struct qe_gpio_chip {
>>
>>   	/* saved_regs used to restore dedicated functions */
>>   	struct qe_pio_regs saved_regs;
>> +
>> +	int irq[32];
>>   };
>>
>>   static void qe_gpio_save_regs(struct of_mm_gpio_chip *mm_gc)
>> @@ -141,6 +144,13 @@ static int qe_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
>>   	return 0;
>>   }
>>
>> +static int qe_gpio_to_irq(struct gpio_chip *gc, unsigned int gpio)
>> +{
>> +	struct qe_gpio_chip *qe_gc = gpiochip_get_data(gc);
>> +
>> +	return qe_gc->irq[gpio] ? : -ENXIO;
>> +}
>> +
>>   struct qe_pin {
>>   	/*
>>   	 * The qe_gpio_chip name is unfortunate, we should change that to
>> @@ -304,6 +314,7 @@ static int qe_gpio_probe(struct platform_device *ofdev)
>>   	struct qe_gpio_chip *qe_gc;
>>   	struct of_mm_gpio_chip *mm_gc;
>>   	struct gpio_chip *gc;
>> +	u32 mask;
>>
>>   	qe_gc = kzalloc(sizeof(*qe_gc), GFP_KERNEL);
>>   	if (!qe_gc) {
>> @@ -313,6 +324,14 @@ static int qe_gpio_probe(struct platform_device *ofdev)
>>
>>   	spin_lock_init(&qe_gc->lock);
>>
>> +	if (!of_property_read_u32(np, "fsl,qe-gpio-irq-mask", &mask)) {
> 
> AFAICT: you can drop the of.h include and just use
> device_property_present() here.

This line reads the value of the mask, I can't see how it can be 
replaced by device_property_present().

> 
>> +		int i, j;
>> +
>> +		for (i = 0, j = 0; i < 32; i++)
>> +			if (mask & (1 << (31 - i)))
>> +				qe_gc->irq[i] = irq_of_parse_and_map(np, j++);
>> +	}
>> +
>>   	mm_gc = &qe_gc->mm_gc;
>>   	gc = &mm_gc->gc;
>>
>> @@ -323,6 +342,7 @@ static int qe_gpio_probe(struct platform_device *ofdev)
>>   	gc->get = qe_gpio_get;
>>   	gc->set = qe_gpio_set;
>>   	gc->set_multiple = qe_gpio_set_multiple;
>> +	gc->to_irq = qe_gpio_to_irq;
>>
>>   	ret = of_mm_gpiochip_add_data(np, mm_gc, qe_gc);
>>   	if (!ret)
>> --
>> 2.49.0
>>
>>
> 
> Bart