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From 29af30435022442ec4eccf3166956b8e0b8a2134 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Mon, 5 Sep 2022 23:13:47 +0200
Subject: [PATCH] gpio: mpc8xxx: Fix support for IRQ_TYPE_LEVEL_LOW flow_type
in mpc85xx
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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@kernel.org>
---
drivers/gpio/gpio-mpc8xxx.c | 1 +
1 file changed, 1 insertion(+)
Index: linux-5.15.67/drivers/gpio/gpio-mpc8xxx.c
===================================================================
--- linux-5.15.67.orig/drivers/gpio/gpio-mpc8xxx.c
+++ linux-5.15.67/drivers/gpio/gpio-mpc8xxx.c
@@ -172,6 +172,7 @@ static int mpc8xxx_irq_set_type(struct i
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)
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