[PATCH v2] pinctrl: qcom: Add intr_target_width field to support increased number of interrupt targets

[Ninad Naik]

SA8775 and newer target have added support for an increased number of
interrupt targets. To implement this change, the intr_target field, which
is used to configure the interrupt target in the interrupt configuration
register is increased from 3 bits to 4 bits.

In accordance to these updates, a new intr_target_width member is
introduced in msm_pingroup structure. This member stores the value of
width of intr_target field in the interrupt configuration register. This
value is used to dynamically calculate and generate mask for setting the
intr_target field. By default, this mask is set to 3 bit wide, to ensure
backward compatibility with the older targets.

Changes in v2 :
-----------------
- Changed initial definition of intr_target_mask variable to use GENMASK().
- Update commit subject appropiately.
- Add Fixes tag.
- v1 : https://lore.kernel.org/all/20230714061010.15817-1-quic_ninanaik@xxxxxxxxxxx/

Fixes: 4b6b18559927 ("pinctrl: qcom: add the tlmm driver sa8775p platforms")
Tested-by: Andrew Halaney <ahalaney@xxxxxxxxxx> # sa8775p-ride
Signed-off-by: Ninad Naik <quic_ninanaik@xxxxxxxxxxx>
Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Reviewed-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
---
 drivers/pinctrl/qcom/pinctrl-msm.c     | 9 ++++++---
 drivers/pinctrl/qcom/pinctrl-msm.h     | 2 ++
 drivers/pinctrl/qcom/pinctrl-sa8775p.c | 1 +
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index 2585ef2b2793..115b83e2d8e6 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -1038,6 +1038,7 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
 	const struct msm_pingroup *g;
+	u32 intr_target_mask = GENMASK(2, 0);
 	unsigned long flags;
 	bool was_enabled;
 	u32 val;
@@ -1074,13 +1075,15 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 	 * With intr_target_use_scm interrupts are routed to
 	 * application cpu using scm calls.
 	 */
+	if (g->intr_target_width)
+		intr_target_mask = GENMASK(g->intr_target_width - 1, 0);
+
 	if (pctrl->intr_target_use_scm) {
 		u32 addr = pctrl->phys_base[0] + g->intr_target_reg;
 		int ret;
 
 		qcom_scm_io_readl(addr, &val);
-
-		val &= ~(7 << g->intr_target_bit);
+		val &= ~(intr_target_mask << g->intr_target_bit);
 		val |= g->intr_target_kpss_val << g->intr_target_bit;
 
 		ret = qcom_scm_io_writel(addr, val);
@@ -1090,7 +1093,7 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 				d->hwirq);
 	} else {
 		val = msm_readl_intr_target(pctrl, g);
-		val &= ~(7 << g->intr_target_bit);
+		val &= ~(intr_target_mask << g->intr_target_bit);
 		val |= g->intr_target_kpss_val << g->intr_target_bit;
 		msm_writel_intr_target(val, pctrl, g);
 	}
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.h b/drivers/pinctrl/qcom/pinctrl-msm.h
index 5e4410bed823..1d2f2e904da1 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.h
+++ b/drivers/pinctrl/qcom/pinctrl-msm.h
@@ -59,6 +59,7 @@ struct pinctrl_pin_desc;
  * @intr_status_bit:      Offset in @intr_status_reg for reading and acking the interrupt
  *                        status.
  * @intr_target_bit:      Offset in @intr_target_reg for configuring the interrupt routing.
+ * @intr_target_width:    Number of bits used for specifying interrupt routing target.
  * @intr_target_kpss_val: Value in @intr_target_bit for specifying that the interrupt from
  *                        this gpio should get routed to the KPSS processor.
  * @intr_raw_status_bit:  Offset in @intr_cfg_reg for the raw status bit.
@@ -100,6 +101,7 @@ struct msm_pingroup {
 	unsigned intr_ack_high:1;
 
 	unsigned intr_target_bit:5;
+	unsigned intr_target_width:5;
 	unsigned intr_target_kpss_val:5;
 	unsigned intr_raw_status_bit:5;
 	unsigned intr_polarity_bit:5;
diff --git a/drivers/pinctrl/qcom/pinctrl-sa8775p.c b/drivers/pinctrl/qcom/pinctrl-sa8775p.c
index 8a5cd15512b9..8fdea25d8d67 100644
--- a/drivers/pinctrl/qcom/pinctrl-sa8775p.c
+++ b/drivers/pinctrl/qcom/pinctrl-sa8775p.c
@@ -46,6 +46,7 @@
 		.intr_enable_bit = 0,		\
 		.intr_status_bit = 0,		\
 		.intr_target_bit = 5,		\
+		.intr_target_width = 4,		\
 		.intr_target_kpss_val = 3,	\
 		.intr_raw_status_bit = 4,	\
 		.intr_polarity_bit = 1,		\
-- 
2.41.0