From: Ciprian Marian Costea <ciprianmarian.costea@oss.nxp.com>
Date: Wed, 11 Mar 2026 08:11:52 +0000 (+0100)
Subject: irqchip/imx-irqsteer: Add NXP S32N79 support
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=5e72917802dd65ad1ff57f2158a9d221b4fddf0b;p=thirdparty%2Flinux.git

irqchip/imx-irqsteer: Add NXP S32N79 support

Add support for the interrupt steering controller found in NXP S32N79
series automotive SoCs.

The S32N79 IRQ_STEER variant differs from the i.MX version by not
implementing the CHANCTRL register. To handle this hardware difference,
introduce a device type data structure with quirks field. The
IRQSTEER_QUIRK_NO_CHANCTRL quirk skips CHANCTRL register access for S32N79
variants.

The interrupt routing functionality and register layout are otherwise
identical between the two variants.

Co-developed-by: Larisa Grigore <larisa.grigore@nxp.com>
Signed-off-by: Larisa Grigore <larisa.grigore@nxp.com>
Signed-off-by: Ciprian Marian Costea <ciprianmarian.costea@oss.nxp.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260311081154.381881-4-ciprianmarian.costea@oss.nxp.com
---

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index dc26effa5b364..2feecfb5a28d9 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -544,11 +544,11 @@ config CSKY_APB_INTC
 
 config IMX_IRQSTEER
 	bool "i.MX IRQSTEER support"
-	depends on ARCH_MXC || COMPILE_TEST
-	default ARCH_MXC
+	depends on ARCH_MXC || ARCH_S32 || COMPILE_TEST
+	default y if ARCH_MXC || ARCH_S32
 	select IRQ_DOMAIN
 	help
-	  Support for the i.MX IRQSTEER interrupt multiplexer/remapper.
+	  Support for the i.MX and S32 IRQSTEER interrupt multiplexer/remapper.
 
 config IMX_INTMUX
 	bool "i.MX INTMUX support" if COMPILE_TEST
diff --git a/drivers/irqchip/irq-imx-irqsteer.c b/drivers/irqchip/irq-imx-irqsteer.c
index 4682ce5bf8d3c..87b07f517be35 100644
--- a/drivers/irqchip/irq-imx-irqsteer.c
+++ b/drivers/irqchip/irq-imx-irqsteer.c
@@ -26,19 +26,38 @@
 
 #define CHAN_MAX_OUTPUT_INT	0xF
 
+/* SoC does not implement the CHANCTRL register */
+#define IRQSTEER_QUIRK_NO_CHANCTRL	BIT(0)
+
+struct irqsteer_devtype_data {
+	u32	quirks;
+};
+
 struct irqsteer_data {
-	void __iomem		*regs;
-	struct clk		*ipg_clk;
-	int			irq[CHAN_MAX_OUTPUT_INT];
-	int			irq_count;
-	raw_spinlock_t		lock;
-	int			reg_num;
-	int			channel;
-	struct irq_domain	*domain;
-	u32			*saved_reg;
-	struct device		*dev;
+	void __iomem				*regs;
+	struct clk				*ipg_clk;
+	int					irq[CHAN_MAX_OUTPUT_INT];
+	int					irq_count;
+	raw_spinlock_t				lock;
+	int					reg_num;
+	int					channel;
+	struct irq_domain			*domain;
+	u32					*saved_reg;
+	struct device				*dev;
+	const struct irqsteer_devtype_data	*devtype_data;
+};
+
+static const struct irqsteer_devtype_data imx_data = { };
+
+static const struct irqsteer_devtype_data s32n79_data = {
+	.quirks	= IRQSTEER_QUIRK_NO_CHANCTRL,
 };
 
+static bool irqsteer_has_chanctrl(const struct irqsteer_devtype_data *data)
+{
+	return !(data->quirks & IRQSTEER_QUIRK_NO_CHANCTRL);
+}
+
 static int imx_irqsteer_get_reg_index(struct irqsteer_data *data,
 				      unsigned long irqnum)
 {
@@ -188,6 +207,10 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	data->devtype_data = device_get_match_data(&pdev->dev);
+	if (!data->devtype_data)
+		return dev_err_probe(&pdev->dev, -ENODEV, "failed to match device data\n");
+
 	/*
 	 * There is one output irq for each group of 64 inputs.
 	 * One register bit map can represent 32 input interrupts.
@@ -210,7 +233,8 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
 	}
 
 	/* steer all IRQs into configured channel */
-	writel_relaxed(BIT(data->channel), data->regs + CHANCTRL);
+	if (irqsteer_has_chanctrl(data->devtype_data))
+		writel_relaxed(BIT(data->channel), data->regs + CHANCTRL);
 
 	data->domain = irq_domain_create_linear(dev_fwnode(&pdev->dev), data->reg_num * 32,
 						&imx_irqsteer_domain_ops, data);
@@ -279,7 +303,9 @@ static void imx_irqsteer_restore_regs(struct irqsteer_data *data)
 {
 	int i;
 
-	writel_relaxed(BIT(data->channel), data->regs + CHANCTRL);
+	if (irqsteer_has_chanctrl(data->devtype_data))
+		writel_relaxed(BIT(data->channel), data->regs + CHANCTRL);
+
 	for (i = 0; i < data->reg_num; i++)
 		writel_relaxed(data->saved_reg[i],
 			       data->regs + CHANMASK(i, data->reg_num));
@@ -319,7 +345,8 @@ static const struct dev_pm_ops imx_irqsteer_pm_ops = {
 };
 
 static const struct of_device_id imx_irqsteer_dt_ids[] = {
-	{ .compatible = "fsl,imx-irqsteer", },
+	{ .compatible = "fsl,imx-irqsteer",	.data = &imx_data },
+	{ .compatible = "nxp,s32n79-irqsteer",	.data = &s32n79_data },
 	{},
 };