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regmap-irq: Add no_status support 

Some devices lack status registers, yet expect to handle interrupts.
Introduce a no_status flag to indicate such a configuration, where
rather than read a status register to verify, all interrupts received
are assumed to be active.

Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/bd501b4b5ff88da24d467f75e8c71b4e0e6f21e2.1677515341.git.william.gray@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
William Breathitt Gray 2023-02-27 11:45:22 -05:00 committed by Mark Brown
parent fe15c26ee2
commit 4d60cac951
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 17 additions and 7 deletions
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22
drivers/base/regmap/regmap-irq.c
View File

@ -433,7 +433,10 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
* possible in order to reduce the I/O overheads.
*/
if (chip->num_main_regs) {
if (chip->no_status) {
/* no status register so default to all active */
memset32(data->status_buf, GENMASK(31, 0), chip->num_regs);
} else if (chip->num_main_regs) {
unsigned int max_main_bits;
unsigned long size;
@ -949,12 +952,17 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
continue;
/* Ack masked but set interrupts */
reg = d->get_irq_reg(d, d->chip->status_base, i);
ret = regmap_read(map, reg, &d->status_buf[i]);
if (ret != 0) {
dev_err(map->dev, "Failed to read IRQ status: %d\n",
ret);
goto err_alloc;
if (d->chip->no_status) {
/* no status register so default to all active */
d->status_buf[i] = GENMASK(31, 0);
} else {
reg = d->get_irq_reg(d, d->chip->status_base, i);
ret = regmap_read(map, reg, &d->status_buf[i]);
if (ret != 0) {
dev_err(map->dev, "Failed to read IRQ status: %d\n",
ret);
goto err_alloc;
}
}
if (chip->status_invert)

2
include/linux/regmap.h
View File

@ -1567,6 +1567,7 @@ struct regmap_irq_chip_data;
* the need for a @sub_reg_offsets table.
* @status_invert: Inverted status register: cleared bits are active interrupts.
* @runtime_pm: Hold a runtime PM lock on the device when accessing it.
* @no_status: No status register: all interrupts assumed generated by device.
*
* @num_regs: Number of registers in each control bank.
* @irqs: Descriptors for individual IRQs. Interrupt numbers are
@ -1631,6 +1632,7 @@ struct regmap_irq_chip {
unsigned int clear_on_unmask:1;
unsigned int not_fixed_stride:1;
unsigned int status_invert:1;
unsigned int no_status:1;
int num_regs;