target/linux/mpc85xx/patches-5.10/110-gpio-mpc8xxx-Fix-support-for-IRQ_TYPE_LEVEL_LOW-flow.patch

   1 From 29af30435022442ec4eccf3166956b8e0b8a2134 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
   3 Date: Mon, 5 Sep 2022 23:13:47 +0200
   4 Subject: [PATCH] gpio: mpc8xxx: Fix support for IRQ_TYPE_LEVEL_LOW flow_type
   5  in mpc85xx
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 Commit e39d5ef67804 ("powerpc/5xxx: extend mpc8xxx_gpio driver to support
  11 mpc512x gpios") implemented support for IRQ_TYPE_LEVEL_LOW flow type in
  12 mpc512x via falling edge type. Do same for mpc85xx which support was added
  13 in commit 345e5c8a1cc3 ("powerpc: Add interrupt support to mpc8xxx_gpio").
  14
  15 Fixes probing of lm90 hwmon driver on mpc85xx based board which use level
  16 interrupt. Without it kernel prints error and refuse lm90 to work:
  17
  18     [   15.258370] genirq: Setting trigger mode 8 for irq 49 failed (mpc8xxx_irq_set_type+0x0/0xf8)
  19     [   15.267168] lm90 0-004c: cannot request IRQ 49
  20     [   15.272708] lm90: probe of 0-004c failed with error -22
  21
  22 Fixes: 345e5c8a1cc3 ("powerpc: Add interrupt support to mpc8xxx_gpio")
  23 Signed-off-by: Pali Rohár <pali@kernel.org>
  24 ---
  25  drivers/gpio/gpio-mpc8xxx.c | 1 +
  26  1 file changed, 1 insertion(+)
  27
  28 --- a/drivers/gpio/gpio-mpc8xxx.c
  29 +++ b/drivers/gpio/gpio-mpc8xxx.c
  30 @@ -169,6 +169,7 @@ static int mpc8xxx_irq_set_type(struct i
  31
  32         switch (flow_type) {
  33         case IRQ_TYPE_EDGE_FALLING:
  34 +       case IRQ_TYPE_LEVEL_LOW:
  35                 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
  36                 gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
  37                         gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)