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regmap: Add no_status support

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This patch adds support for devices which don't support readback of
 individual interrupt statuses, we report all interrupts as firing and
 hope the consumers do the right thing.
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Merge tag 'regmap-no-status' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap into gpio/for-next

regmap: Add no_status support

This patch adds support for devices which don't support readback of
individual interrupt statuses, we report all interrupts as firing and
hope the consumers do the right thing.
This commit is contained in:
Bartosz Golaszewski 2023-03-22 17:46:14 +01:00
commit ae5ae35467
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;