[PATCH 1/2] ARM: shmobile: irqpin: add a DT property to enable masking on parent

[Guennadi Liakhovetski]

To disable spurious interrupts, that get triggered on certain hardware, the
irqpin driver masks them on the parent interrupt controller. To specify
such broken devices a .control_parent parameter can be provided in the
platform data. In the DT case we need a property, to do the same.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski at gmx.de>
---

These two patches simply split the earlier "ARM: shmobile: irqpin: fix 
handling of spurious interrupts in DT case" patch into two parts. 
Otherwise no change.

 .../interrupt-controller/renesas,intc-irqpin.txt   |    2 ++
 drivers/irqchip/irq-renesas-intc-irqpin.c          |    7 +++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/interrupt-controller/renesas,intc-irqpin.txt b/Documentation/devicetree/bindings/interrupt-controller/renesas,intc-irqpin.txt
index c6f09b7..152b10a 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/renesas,intc-irqpin.txt
+++ b/Documentation/devicetree/bindings/interrupt-controller/renesas,intc-irqpin.txt
@@ -11,3 +11,5 @@ Optional properties:
   resource allocation properties
 - sense-bitfield-width: width of a single sense bitfield in the SENSE register,
   if different from the default 4 bits
+- control-parent: disable and enable interrupts on the parent interrupt
+  controller, needed for some broken implementations
diff --git a/drivers/irqchip/irq-renesas-intc-irqpin.c b/drivers/irqchip/irq-renesas-intc-irqpin.c
index 4aca1b2..82cec63 100644
--- a/drivers/irqchip/irq-renesas-intc-irqpin.c
+++ b/drivers/irqchip/irq-renesas-intc-irqpin.c
@@ -348,11 +348,14 @@ static int intc_irqpin_probe(struct platform_device *pdev)
 	}
 
 	/* deal with driver instance configuration */
-	if (pdata)
+	if (pdata) {
 		memcpy(&p->config, pdata, sizeof(*pdata));
-	else
+	} else {
 		of_property_read_u32(pdev->dev.of_node, "sense-bitfield-width",
 				     &p->config.sense_bitfield_width);
+		p->config.control_parent = of_property_read_bool(pdev->dev.of_node,
+								 "control-parent");
+	}
 	if (!p->config.sense_bitfield_width)
 		p->config.sense_bitfield_width = 4; /* default to 4 bits */
 
-- 
1.7.2.5