[PATCH v2 2/3] regmap: irq: add ack_invert flag for chips using cleared bits as ack

[Barry Song]

From: Guo Zeng <guo.z...@csr.com>

An user will be CSR SiRFSoC ARM chips.

Signed-off-by: Guo Zeng <guo.z...@csr.com>
Signed-off-by: Barry Song <baohua.s...@csr.com>
---
 drivers/base/regmap/regmap-irq.c | 12 ++++++++++--
 include/linux/regmap.h           |  2 ++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 1821c3b..14af2c6 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -132,7 +132,11 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
                if (d->mask_buf[i] && (d->chip->ack_base || d->chip->use_ack)) {
                        reg = d->chip->ack_base +
                                (i * map->reg_stride * d->irq_reg_stride);
-                       ret = regmap_write(map, reg, d->mask_buf[i]);
+                       /* some chips ack by write 0 */
+                       if (d->chip->ack_invert)
+                               ret = regmap_write(map, reg, ~d->mask_buf[i]);
+                       else
+                               ret = regmap_write(map, reg, d->mask_buf[i]);
                        if (ret != 0)
                                dev_err(d->map->dev, "Failed to ack 0x%x: %d\n",
                                        reg, ret);
@@ -469,7 +473,11 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int 
irq_flags,
                if (d->status_buf[i] && (chip->ack_base || chip->use_ack)) {
                        reg = chip->ack_base +
                                (i * map->reg_stride * d->irq_reg_stride);
-                       ret = regmap_write(map, reg,
+                       if (chip->ack_invert)
+                               ret = regmap_write(map, reg,
+                                       ~(d->status_buf[i] & d->mask_buf[i]));
+                       else
+                               ret = regmap_write(map, reg,
                                        d->status_buf[i] & d->mask_buf[i]);
                        if (ret != 0) {
                                dev_err(map->dev, "Failed to ack 0x%x: %d\n",
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index f98fe9f..f36c9f9 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -809,6 +809,7 @@ struct regmap_irq {
  * @init_ack_masked: Ack all masked interrupts once during initalization.
  * @mask_invert: Inverted mask register: cleared bits are masked out.
  * @use_ack:     Use @ack register even if it is zero.
+ * @ack_invert:  Inverted ack register: cleared bits for ack.
  * @wake_invert: Inverted wake register: cleared bits are wake enabled.
  * @runtime_pm:  Hold a runtime PM lock on the device when accessing it.
  *
@@ -829,6 +830,7 @@ struct regmap_irq_chip {
        bool init_ack_masked:1;
        bool mask_invert:1;
        bool use_ack:1;
+       bool ack_invert:1;
        bool wake_invert:1;
        bool runtime_pm:1;
 
-- 
1.9.1

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