[PATCH v3 1/1] regmap-irq: Introduce inverted status registers support

From: Maxim Kochetkov
Date: Mon May 24 2021 - 23:40:25 EST


Some interrupt controllers have inverted status register:
cleared bits is active interrupts and set bits is inactive interrupts,
so add inverted status support to the framework.

Signed-off-by: Maxim Kochetkov <fido_max@xxxxxxxx>
---
drivers/base/regmap/regmap-irq.c | 7 +++++++
include/linux/regmap.h | 2 ++
2 files changed, 9 insertions(+)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 760296a4b606..d2656581a608 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -531,6 +531,10 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
}
}

+ if (chip->status_invert)
+ for (i = 0; i < data->chip->num_regs; i++)
+ data->status_buf[i] = ~data->status_buf[i];
+
/*
* Ignore masked IRQs and ack if we need to; we ack early so
* there is no race between handling and acknowleding the
@@ -800,6 +804,9 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
goto err_alloc;
}

+ if (chip->status_invert)
+ d->status_buf[i] = ~d->status_buf[i];
+
if (d->status_buf[i] && (chip->ack_base || chip->use_ack)) {
reg = sub_irq_reg(d, d->chip->ack_base, i);
if (chip->ack_invert)
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index bf5a834d1774..f5f08dd0a116 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -1449,6 +1449,7 @@ struct regmap_irq_sub_irq_map {
* @not_fixed_stride: Used when chip peripherals are not laid out with fixed
* stride. Must be used with sub_reg_offsets containing the
* offsets to each peripheral.
+ * @status_invert: Inverted status register: cleared bits are active interrupts.
* @runtime_pm: Hold a runtime PM lock on the device when accessing it.
*
* @num_regs: Number of registers in each control bank.
@@ -1501,6 +1502,7 @@ struct regmap_irq_chip {
bool type_in_mask:1;
bool clear_on_unmask:1;
bool not_fixed_stride:1;
+ bool status_invert:1;

int num_regs;

--
2.31.1