gpio: mpc8xxx: Fix support for IRQ_TYPE_LEVEL_LOW flow_type in mpc85xx

[ Upstream commit 279c12df8d2efb28def9d037f288cbfb97c30fe2 ]

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>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index a964e25ea620611f8302d5f4b7b78053087cdf02..763256efddc2b1f9062fb84400d8872ef4dc973e 100644 (file)
--- 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)