linux-kernel - [PATCH] gpio: tegra186: remove unneeded loop in tegra186_gpio_init_route

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Date:   Wed, 25 Jan 2023 13:26:31 -0800
From:   Tom Rix <trix@...hat.com>
To:     linus.walleij@...aro.org, brgl@...ev.pl, thierry.reding@...il.com,
        jonathanh@...dia.com
Cc:     linux-gpio@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: [PATCH] gpio: tegra186: remove unneeded loop in tegra186_gpio_init_route_mapping()

Reviewing the j loop over num_irqs_per_bank, in the code previous
to the fixes: commit, every j was used. now only when j == 0.
If only j == 0 is used, there is no need for the loop.

Fixes: 210386804745 ("gpio: tegra186: Support multiple interrupts per bank")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/gpio/gpio-tegra186.c | 40 ++++++++++++++++--------------------
 1 file changed, 18 insertions(+), 22 deletions(-)

diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
index 9941f35af823..14c872b6ad05 100644
--- a/drivers/gpio/gpio-tegra186.c
+++ b/drivers/gpio/gpio-tegra186.c
@@ -677,7 +677,7 @@ static const struct of_device_id tegra186_pmc_of_match[] = {
 static void tegra186_gpio_init_route_mapping(struct tegra_gpio *gpio)
 {
 	struct device *dev = gpio->gpio.parent;
-	unsigned int i, j;
+	unsigned int i;
 	u32 value;
 
 	for (i = 0; i < gpio->soc->num_ports; i++) {
@@ -699,27 +699,23 @@ static void tegra186_gpio_init_route_mapping(struct tegra_gpio *gpio)
 			 * On Tegra194 and later, each pin can be routed to one or more
 			 * interrupts.
 			 */
-			for (j = 0; j < gpio->num_irqs_per_bank; j++) {
-				dev_dbg(dev, "programming default interrupt routing for port %s\n",
-					port->name);
-
-				offset = TEGRA186_GPIO_INT_ROUTE_MAPPING(p, j);
-
-				/*
-				 * By default we only want to route GPIO pins to IRQ 0. This works
-				 * only under the assumption that we're running as the host kernel
-				 * and hence all GPIO pins are owned by Linux.
-				 *
-				 * For cases where Linux is the guest OS, the hypervisor will have
-				 * to configure the interrupt routing and pass only the valid
-				 * interrupts via device tree.
-				 */
-				if (j == 0) {
-					value = readl(base + offset);
-					value = BIT(port->pins) - 1;
-					writel(value, base + offset);
-				}
-			}
+			dev_dbg(dev, "programming default interrupt routing for port %s\n",
+				port->name);
+
+			offset = TEGRA186_GPIO_INT_ROUTE_MAPPING(p, 0);
+
+			/*
+			 * By default we only want to route GPIO pins to IRQ 0. This works
+			 * only under the assumption that we're running as the host kernel
+			 * and hence all GPIO pins are owned by Linux.
+			 *
+			 * For cases where Linux is the guest OS, the hypervisor will have
+			 * to configure the interrupt routing and pass only the valid
+			 * interrupts via device tree.
+			 */
+			value = readl(base + offset);
+			value = BIT(port->pins) - 1;
+			writel(value, base + offset);
 		}
 	}
 }
-- 
2.26.3