linux-kernel - [PATCH 1/2] slimbus: qcom-ngd-ctrl: Use platform_get

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Date:   Fri, 29 Apr 2022 17:50:50 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Steev Klimaszewski <steev@...i.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 1/2] slimbus: qcom-ngd-ctrl: Use platform_get_irq() to get the interrupt

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

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>
Tested-By: Steev Klimaszewski <steev@...i.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index 7040293c2ee8..0f29a08b4c09 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1526,13 +1526,11 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
 	if (IS_ERR(ctrl->base))
 		return PTR_ERR(ctrl->base);
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no slimbus IRQ resource\n");
-		return -ENODEV;
-	}
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
 
-	ret = devm_request_irq(dev, res->start, qcom_slim_ngd_interrupt,
+	ret = devm_request_irq(dev, ret, qcom_slim_ngd_interrupt,
 			       IRQF_TRIGGER_HIGH, "slim-ngd", ctrl);
 	if (ret) {
 		dev_err(&pdev->dev, "request IRQ failed\n");
-- 
2.21.0