linux-kernel - [PATCH] soc: fsl: qe: convert QE interrupt controller to platform

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Message-Id: <20210705111250.1513634-1-fido_max@inbox.ru>
Date:   Mon,  5 Jul 2021 14:12:50 +0300
From:   Maxim Kochetkov <fido_max@...ox.ru>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        saravanak@...gle.com, leoyang.li@....com, qiang.zhao@....com,
        gregkh@...uxfoundation.org, Maxim Kochetkov <fido_max@...ox.ru>
Subject: [PATCH] soc: fsl: qe: convert QE interrupt controller to platform_device

Since 5.13 QE's ucc nodes can't get interrupts from devicetree:

	ucc@...0 {
		cell-index = <1>;
		reg = <0x2000 0x200>;
		interrupts = <32>;
		interrupt-parent = <&qeic>;
	};

Now fw_devlink expects driver to create and probe a struct device
for interrupt controller.

So lets convert this driver to simple platform_device with probe().

[1] - https://lore.kernel.org/lkml/CAGETcx9PiX==mLxB9PO8Myyk6u2vhPVwTMsA5NkD-ywH5xhusw@mail.gmail.com
Fixes: e590474768f1 ("driver core: Set fw_devlink=on by default")
Fixes: ea718c699055 ("Revert "Revert "driver core: Set fw_devlink=on by default""")
Signed-off-by: Maxim Kochetkov <fido_max@...ox.ru>
---
 drivers/soc/fsl/qe/qe_ic.c | 38 +++++++++++++++++++++++---------------
 1 file changed, 23 insertions(+), 15 deletions(-)

diff --git a/drivers/soc/fsl/qe/qe_ic.c b/drivers/soc/fsl/qe/qe_ic.c
index 3f711c1a0996..03d291376895 100644
--- a/drivers/soc/fsl/qe/qe_ic.c
+++ b/drivers/soc/fsl/qe/qe_ic.c
@@ -23,6 +23,7 @@
 #include <linux/signal.h>
 #include <linux/device.h>
 #include <linux/spinlock.h>
+#include <linux/platform_device.h>
 #include <asm/irq.h>
 #include <asm/io.h>
 #include <soc/fsl/qe/qe.h>
@@ -404,27 +405,28 @@ static void qe_ic_cascade_muxed_mpic(struct irq_desc *desc)
 	chip->irq_eoi(&desc->irq_data);
 }
 
-static void __init qe_ic_init(struct device_node *node)
+static int qe_ic_init(struct platform_device *pdev)
 {
 	void (*low_handler)(struct irq_desc *desc);
 	void (*high_handler)(struct irq_desc *desc);
 	struct qe_ic *qe_ic;
 	struct resource res;
+	struct device_node *node = pdev->dev.of_node;
 	u32 ret;
 
 	ret = of_address_to_resource(node, 0, &res);
 	if (ret)
-		return;
+		return -ENODEV;
 
 	qe_ic = kzalloc(sizeof(*qe_ic), GFP_KERNEL);
 	if (qe_ic == NULL)
-		return;
+		return -ENOMEM;
 
 	qe_ic->irqhost = irq_domain_add_linear(node, NR_QE_IC_INTS,
 					       &qe_ic_host_ops, qe_ic);
 	if (qe_ic->irqhost == NULL) {
 		kfree(qe_ic);
-		return;
+		return -ENODEV;
 	}
 
 	qe_ic->regs = ioremap(res.start, resource_size(&res));
@@ -437,7 +439,7 @@ static void __init qe_ic_init(struct device_node *node)
 	if (!qe_ic->virq_low) {
 		printk(KERN_ERR "Failed to map QE_IC low IRQ\n");
 		kfree(qe_ic);
-		return;
+		return -ENODEV;
 	}
 	if (qe_ic->virq_high != qe_ic->virq_low) {
 		low_handler = qe_ic_cascade_low;
@@ -456,20 +458,26 @@ static void __init qe_ic_init(struct device_node *node)
 		irq_set_handler_data(qe_ic->virq_high, qe_ic);
 		irq_set_chained_handler(qe_ic->virq_high, high_handler);
 	}
+	return 0;
 }
+static const struct of_device_id qe_ic_ids[] = {
+	{ .compatible = "fsl,qe-ic"},
+	{ .compatible = "qeic"},
+	{},
+};
 
-static int __init qe_ic_of_init(void)
+static struct platform_driver qe_ic_driver =
 {
-	struct device_node *np;
+	.driver	= {
+		.name		= "qe-ic",
+		.of_match_table	= qe_ic_ids,
+	},
+	.probe	= qe_ic_init,
+};
 
-	np = of_find_compatible_node(NULL, NULL, "fsl,qe-ic");
-	if (!np) {
-		np = of_find_node_by_type(NULL, "qeic");
-		if (!np)
-			return -ENODEV;
-	}
-	qe_ic_init(np);
-	of_node_put(np);
+static int __init qe_ic_of_init(void)
+{
+	platform_driver_register(&qe_ic_driver);
 	return 0;
 }
 subsys_initcall(qe_ic_of_init);
-- 
2.31.1