[PATCH v1 4/4] irqchip: irq-mtk-cirq: Add support for System CIRQ on MT8192

[AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>]

On some SoCs the System CIRQ register layout is slightly different,
as there are more registers per function and in some cases other
differences later in the layout: this is seen on at least MT8192,
but it's also valid for some other "contemporary" SoCs both for
Chromebooks and for smartphones.

Add the new "v2" register layout and use it if the compatible
"mediatek,mt8192-cirq" is found; to retain compatibility with
older devicetrees and/or with SoCs that don't need any register
layout variation, if no "special" compatible is found, we use
the "v1" register layout by default.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
 drivers/irqchip/irq-mtk-cirq.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-mtk-cirq.c b/drivers/irqchip/irq-mtk-cirq.c
index affbc0f48550..8d6b3d9c40cf 100644
--- a/drivers/irqchip/irq-mtk-cirq.c
+++ b/drivers/irqchip/irq-mtk-cirq.c
@@ -40,6 +40,18 @@ static const u32 mtk_cirq_regs_v1[] = {
 	[CIRQ_CONTROL]	= 0x300,
 };
 
+static const u32 mtk_cirq_regs_v2[] = {
+	[CIRQ_STA]	= 0x0,
+	[CIRQ_ACK]	= 0x80,
+	[CIRQ_MASK_SET]	= 0x180,
+	[CIRQ_MASK_CLR]	= 0x200,
+	[CIRQ_SENS_SET]	= 0x300,
+	[CIRQ_SENS_CLR]	= 0x380,
+	[CIRQ_POL_SET]	= 0x480,
+	[CIRQ_POL_CLR]	= 0x500,
+	[CIRQ_CONTROL]	= 0x600,
+};
+
 #define CIRQ_EN	0x1
 #define CIRQ_EDGE	0x2
 #define CIRQ_FLUSH	0x4
@@ -262,12 +274,15 @@ static inline void mtk_cirq_syscore_init(void) {}
 #endif
 
 static const struct of_device_id mtk_cirq_of_match[] = {
-	{ .compatible = "mediatek,
+	{ .compatible = "mediatek,mt8192-cirq", .data = &mtk_cirq_regs_v2 },
+	{ /* sentinel */ }
+};
 
 static int __init mtk_cirq_of_init(struct device_node *node,
 				   struct device_node *parent)
 {
 	struct irq_domain *domain, *domain_parent;
+	const struct of_device_id *match;
 	unsigned int irq_num;
 	int ret;
 
@@ -298,7 +313,11 @@ static int __init mtk_cirq_of_init(struct device_node *node,
 	if (ret)
 		goto out_unmap;
 
-	cirq_data->regs = mtk_cirq_regs_v1;
+	match = of_match_node(mtk_cirq_of_match, node);
+	if (match)
+		cirq_data->regs = match->data;
+	else
+		cirq_data->regs = mtk_cirq_regs_v1;
 
 	irq_num = cirq_data->ext_irq_end - cirq_data->ext_irq_start + 1;
 	domain = irq_domain_add_hierarchy(domain_parent, 0,
-- 
2.38.1