mailbox: imx: support dual interrupts

i.MX93 S401 MU support two interrupts: tx empty and rx full.

 - Introduce a new flag IMX_MU_V2_IRQ for the dual interrupt case
 - Update Copyright

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

Author: MrVan

drivers/mailbox/imx-mailbox.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2018 Pengutronix, Oleksij Rempel <o.rempel@pengutronix.de>
+ * Copyright 2022 NXP, Peng Fan <peng.fan@nxp.com>
  */
 
 #include <linux/clk.h>
@@ -28,11 +29,12 @@
 #define IMX_MU_SECO_TX_TOUT (msecs_to_jiffies(3000))
 #define IMX_MU_SECO_RX_TOUT (msecs_to_jiffies(3000))
 
+/* Please not change TX & RX */
 enum imx_mu_chan_type {
-	IMX_MU_TYPE_TX,		/* Tx */
-	IMX_MU_TYPE_RX,		/* Rx */
-	IMX_MU_TYPE_TXDB,	/* Tx doorbell */
-	IMX_MU_TYPE_RXDB,	/* Rx doorbell */
+	IMX_MU_TYPE_TX		= 0, /* Tx */
+	IMX_MU_TYPE_RX		= 1, /* Rx */
+	IMX_MU_TYPE_TXDB	= 2, /* Tx doorbell */
+	IMX_MU_TYPE_RXDB	= 3, /* Rx doorbell */
 };
 
 enum imx_mu_xcr {
@@ -92,6 +94,7 @@ enum imx_mu_type {
 	IMX_MU_V1,
 	IMX_MU_V2 = BIT(1),
 	IMX_MU_V2_S4 = BIT(15),
+	IMX_MU_V2_IRQ = BIT(16),
 };
 
 struct imx_mu_dcfg {
@@ -536,7 +539,7 @@ static int imx_mu_startup(struct mbox_chan *chan)
 {
 	struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
 	struct imx_mu_con_priv *cp = chan->con_priv;
-	unsigned long irq_flag = IRQF_SHARED;
+	unsigned long irq_flag = 0;
 	int ret;
 
 	pm_runtime_get_sync(priv->dev);
@@ -551,11 +554,12 @@ static int imx_mu_startup(struct mbox_chan *chan)
 	if (!priv->dev->pm_domain)
 		irq_flag |= IRQF_NO_SUSPEND;
 
-	ret = request_irq(priv->irq[0], imx_mu_isr, irq_flag,
-			  cp->irq_desc, chan);
+	if (!(priv->dcfg->type & IMX_MU_V2_IRQ))
+		irq_flag |= IRQF_SHARED;
+
+	ret = request_irq(priv->irq[cp->type], imx_mu_isr, irq_flag, cp->irq_desc, chan);
 	if (ret) {
-		dev_err(priv->dev,
-			"Unable to acquire IRQ %d\n", priv->irq[0]);
+		dev_err(priv->dev, "Unable to acquire IRQ %d\n", priv->irq[cp->type]);
 		return ret;
 	}
 
@@ -598,7 +602,7 @@ static void imx_mu_shutdown(struct mbox_chan *chan)
 		break;
 	}
 
-	free_irq(priv->irq[0], chan);
+	free_irq(priv->irq[cp->type], chan);
 	pm_runtime_put_sync(priv->dev);
 }
 
@@ -749,7 +753,7 @@ static int imx_mu_probe(struct platform_device *pdev)
 	struct device_node *np = dev->of_node;
 	struct imx_mu_priv *priv;
 	const struct imx_mu_dcfg *dcfg;
-	int ret;
+	int i, ret;
 	u32 size;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -762,14 +766,25 @@ static int imx_mu_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
-	priv->irq[0] = platform_get_irq(pdev, 0);
-	if (priv->irq[0] < 0)
-		return priv->irq[0];
-
 	dcfg = of_device_get_match_data(dev);
 	if (!dcfg)
 		return -EINVAL;
 	priv->dcfg = dcfg;
+	if (priv->dcfg->type & IMX_MU_V2_IRQ) {
+		priv->irq[IMX_MU_TYPE_TX] = platform_get_irq_byname(pdev, "tx");
+		if (priv->irq[IMX_MU_TYPE_TX] < 0)
+			return priv->irq[IMX_MU_TYPE_TX];
+		priv->irq[IMX_MU_TYPE_RX] = platform_get_irq_byname(pdev, "rx");
+		if (priv->irq[IMX_MU_TYPE_RX] < 0)
+			return priv->irq[IMX_MU_TYPE_RX];
+	} else {
+		ret = platform_get_irq(pdev, 0);
+		if (ret < 0)
+			return ret;
+
+		for (i = 0; i < IMX_MU_CHANS; i++)
+			priv->irq[i] = ret;
+	}
 
 	if (priv->dcfg->type & IMX_MU_V2_S4)
 		size = sizeof(struct imx_s4_rpc_msg_max);