linux-kernel - [PATCH v2 2/6] irqchip/sunxi-nmi: Add support for the V3s NMI

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Date:   Tue,  3 Nov 2020 21:50:54 +0100
From:   Paul Kocialkowski <contact@...lk.fr>
To:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Paul Kocialkowski <contact@...lk.fr>,
        Matteo Scordino <matteo.scordino@...il.com>
Subject: [PATCH v2 2/6] irqchip/sunxi-nmi: Add support for the V3s NMI

The V3s/V3 has a NMI IRQ controller, which is mainly used for the AXP209
interrupt. In great wisdom, Allwinner decided to invert the enable and
pending register offsets, compared to the A20.

As a result, a specific compatible and register description is required
for the V3s. This was tested with an AXP209 on a V3 board.

Acked-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Paul Kocialkowski <contact@...lk.fr>
---
 drivers/irqchip/irq-sunxi-nmi.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-sunxi-nmi.c b/drivers/irqchip/irq-sunxi-nmi.c
index a412b5d5d0fa..59e0e4612ef7 100644
--- a/drivers/irqchip/irq-sunxi-nmi.c
+++ b/drivers/irqchip/irq-sunxi-nmi.c
@@ -44,6 +44,10 @@
 #define SUN7I_NMI_PENDING	0x04
 #define SUN7I_NMI_ENABLE	0x08
 
+#define SUN8I_V3S_NMI_CTRL	0x00
+#define SUN8I_V3S_NMI_ENABLE	0x04
+#define SUN8I_V3S_NMI_PENDING	0x08
+
 #define SUN9I_NMI_CTRL		0x00
 #define SUN9I_NMI_ENABLE	0x04
 #define SUN9I_NMI_PENDING	0x08
@@ -79,6 +83,12 @@ static const struct sunxi_sc_nmi_reg_offs sun7i_reg_offs __initconst = {
 	.enable	= SUN7I_NMI_ENABLE,
 };
 
+static const struct sunxi_sc_nmi_reg_offs sun8i_v3s_reg_offs __initconst = {
+	.ctrl	= SUN8I_V3S_NMI_CTRL,
+	.pend	= SUN8I_V3S_NMI_PENDING,
+	.enable	= SUN8I_V3S_NMI_ENABLE,
+};
+
 static const struct sunxi_sc_nmi_reg_offs sun9i_reg_offs __initconst = {
 	.ctrl	= SUN9I_NMI_CTRL,
 	.pend	= SUN9I_NMI_PENDING,
@@ -165,7 +175,6 @@ static int __init sunxi_sc_nmi_irq_init(struct device_node *node,
 	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
 	int ret;
 
-
 	domain = irq_domain_add_linear(node, 1, &irq_generic_chip_ops, NULL);
 	if (!domain) {
 		pr_err("Could not register interrupt domain.\n");
@@ -254,6 +263,13 @@ static int __init sun7i_sc_nmi_irq_init(struct device_node *node,
 }
 IRQCHIP_DECLARE(sun7i_sc_nmi, "allwinner,sun7i-a20-sc-nmi", sun7i_sc_nmi_irq_init);
 
+static int __init sun8i_v3s_sc_nmi_irq_init(struct device_node *node,
+					    struct device_node *parent)
+{
+	return sunxi_sc_nmi_irq_init(node, &sun8i_v3s_reg_offs);
+}
+IRQCHIP_DECLARE(sun8i_v3s_sc_nmi, "allwinner,sun8i-v3s-sc-nmi", sun8i_v3s_sc_nmi_irq_init);
+
 static int __init sun9i_nmi_irq_init(struct device_node *node,
 				     struct device_node *parent)
 {
-- 
2.29.1