[PATCH V4 4/5] mailbox: imx: support dual interrupts

[Peng Fan (OSS)]

From: Peng Fan <peng.fan at nxp.com>

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 author and Copyright

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 drivers/mailbox/imx-mailbox.c | 37 ++++++++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 9 deletions(-)

diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
index 03699843a6fd..4bc59a6cad20 100644
--- a/drivers/mailbox/imx-mailbox.c
+++ b/drivers/mailbox/imx-mailbox.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2018 Pengutronix, Oleksij Rempel <o.rempel at pengutronix.de>
+ * Copyright 2022 NXP, Peng Fan <peng.fan at nxp.com>
  */
 
 #include <linux/clk.h>
@@ -28,6 +29,7 @@
 #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 */
@@ -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 +539,8 @@ 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 irq;
 	int ret;
 
 	pm_runtime_get_sync(priv->dev);
@@ -551,11 +555,16 @@ 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 = priv->irq[cp->type];
+	} else {
+		irq = priv->irq[0];
+		irq_flag |= IRQF_SHARED;
+	}
+
+	ret = request_irq(irq, 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", irq);
 		return ret;
 	}
 
@@ -762,14 +771,23 @@ 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 {
+		priv->irq[0] = platform_get_irq(pdev, 0);
+		if (priv->irq[0] < 0)
+			return priv->irq[0];
+
+	}
 
 	if (priv->dcfg->type & IMX_MU_V2_S4)
 		size = sizeof(struct imx_s4_rpc_msg_max);
@@ -1001,5 +1019,6 @@ static struct platform_driver imx_mu_driver = {
 module_platform_driver(imx_mu_driver);
 
 MODULE_AUTHOR("Oleksij Rempel <o.rempel at pengutronix.de>");
+MODULE_AUTHOR("Peng Fan <peng.fan at nxp.com>");
 MODULE_DESCRIPTION("Message Unit driver for i.MX");
 MODULE_LICENSE("GPL v2");
-- 
2.25.1