linux-kernel - [PATCH v2] gpio: tegra186: Check PMC driver status before any request

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Date:   Wed, 7 Jun 2023 17:01:04 +0530
From:   Prathamesh Shete <pshete@...dia.com>
To:     <linus.walleij@...aro.org>, <brgl@...ev.pl>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <linux-tegra@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <smangipudi@...dia.com>, <pshete@...dia.com>,
        Manish Bhardwaj <mbhardwaj@...dia.com>
Subject: [PATCH v2] gpio: tegra186: Check PMC driver status before any request

When the PMC device is disabled, probing of the Tegra186 GPIO driver
fails because the IRQ domain that is registered by the PMC driver is
not found. The PMC IRQ domain is only used for wake-up and does not
impact GPIO functionality in general. Therefore, if the PMC device is
disabled, skip looking up the PMC IRQ domain to allow the GPIO driver
to be probed.

Signed-off-by: Manish Bhardwaj <mbhardwaj@...dia.com>
Signed-off-by: Prathamesh Shete <pshete@...dia.com>
---
 drivers/gpio/gpio-tegra186.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
index 464b0ea3b6f1..80d08ddde40e 100644
--- a/drivers/gpio/gpio-tegra186.c
+++ b/drivers/gpio/gpio-tegra186.c
@@ -964,11 +964,15 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
 
 	np = of_find_matching_node(NULL, tegra186_pmc_of_match);
 	if (np) {
-		irq->parent_domain = irq_find_host(np);
-		of_node_put(np);
-
-		if (!irq->parent_domain)
-			return -EPROBE_DEFER;
+		if (of_device_is_available(np)) {
+			irq->parent_domain = irq_find_host(np);
+			of_node_put(np);
+
+			if (!irq->parent_domain)
+				return -EPROBE_DEFER;
+		} else {
+			of_node_put(np);
+		}
 	}
 
 	irq->map = devm_kcalloc(&pdev->dev, gpio->gpio.ngpio,
-- 
2.17.1