The PM8008 has separate set and clear registers for controlling its interrupt masks. These are likely volatile registers which read as 0, and writing a '1' bit sets or clears the corresponding bit in the mask register.
The PM8008's regmap config doesn't enable a cache, so all register access is already volatile. Adding the mask_writeonly flag should reduce bus traffic by avoiding a read-modify-write on the mask set/clear registers.
Signed-off-by: Aidan MacDonald aidanmacdonald.0x0@gmail.com --- drivers/mfd/qcom-pm8008.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c index 7bc6becfe7f4..c778f2f87a17 100644 --- a/drivers/mfd/qcom-pm8008.c +++ b/drivers/mfd/qcom-pm8008.c @@ -141,6 +141,7 @@ static struct regmap_irq_chip pm8008_irq_chip = { .status_base = PM8008_STATUS_BASE, .mask_base = PM8008_MASK_BASE, .unmask_base = PM8008_UNMASK_BASE, + .mask_writeonly = true, .ack_base = PM8008_ACK_BASE, .config_base = pm8008_config_regs, .num_config_bases = ARRAY_SIZE(pm8008_config_regs),