linux-kernel - [PATCH 05/10] serial: pxa: Use platform_get

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Message-Id: <20211224142917.6966-6-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date:   Fri, 24 Dec 2021 14:29:11 +0000
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     linux-serial@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH 05/10] serial: pxa: Use platform_get_irq() to get the interrupt

platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypasses the hierarchical setup and messes up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq().

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/tty/serial/pxa.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index 41319ef96fa6..30b099746a75 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -842,14 +842,18 @@ static int serial_pxa_probe_dt(struct platform_device *pdev,
 static int serial_pxa_probe(struct platform_device *dev)
 {
 	struct uart_pxa_port *sport;
-	struct resource *mmres, *irqres;
+	struct resource *mmres;
 	int ret;
+	int irq;
 
 	mmres = platform_get_resource(dev, IORESOURCE_MEM, 0);
-	irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0);
-	if (!mmres || !irqres)
+	if (!mmres)
 		return -ENODEV;
 
+	irq = platform_get_irq(dev, 0);
+	if (irq < 0)
+		return irq;
+
 	sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL);
 	if (!sport)
 		return -ENOMEM;
@@ -869,7 +873,7 @@ static int serial_pxa_probe(struct platform_device *dev)
 	sport->port.type = PORT_PXA;
 	sport->port.iotype = UPIO_MEM;
 	sport->port.mapbase = mmres->start;
-	sport->port.irq = irqres->start;
+	sport->port.irq = irq;
 	sport->port.fifosize = 64;
 	sport->port.ops = &serial_pxa_pops;
 	sport->port.dev = &dev->dev;
-- 
2.17.1