linux-kernel - [PATCH] gpio: mpc8xxx: Fix support for IRQ_TYPE_LEVEL_LOW flow

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Date:   Tue,  6 Sep 2022 12:54:31 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] gpio: mpc8xxx: Fix support for IRQ_TYPE_LEVEL_LOW flow_type in mpc85xx

Commit e39d5ef67804 ("powerpc/5xxx: extend mpc8xxx_gpio driver to support
mpc512x gpios") implemented support for IRQ_TYPE_LEVEL_LOW flow type in
mpc512x via falling edge type. Do same for mpc85xx which support was added
in commit 345e5c8a1cc3 ("powerpc: Add interrupt support to mpc8xxx_gpio").

Fixes probing of lm90 hwmon driver on mpc85xx based board which use level
interrupt. Without it kernel prints error and refuse lm90 to work:

    [   15.258370] genirq: Setting trigger mode 8 for irq 49 failed (mpc8xxx_irq_set_type+0x0/0xf8)
    [   15.267168] lm90 0-004c: cannot request IRQ 49
    [   15.272708] lm90: probe of 0-004c failed with error -22

Fixes: 345e5c8a1cc3 ("powerpc: Add interrupt support to mpc8xxx_gpio")
Signed-off-by: Pali Rohár <pali@...nel.org>
---
 drivers/gpio/gpio-mpc8xxx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index a964e25ea620..763256efddc2 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -172,6 +172,7 @@ static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
 
 	switch (flow_type) {
 	case IRQ_TYPE_EDGE_FALLING:
+	case IRQ_TYPE_LEVEL_LOW:
 		raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
 		gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
 			gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
-- 
2.20.1