linux-kernel - [PATCH v3 1/2] gpio: tegra: Convert to immutable irq chip

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Date:   Tue, 18 Oct 2022 11:49:04 +0300
From:   Svyatoslav Ryhel <clamor95@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Dmitry Osipenko <digetx@...il.com>
Cc:     linux-gpio@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/2] gpio: tegra: Convert to immutable irq chip

Update the driver to use an immutable IRQ chip to fix this warning:

    "not an immutable chip, please consider fixing it!"

Preserve per-chip labels by adding an ->irq_print_chip() callback.

Tested-by: Svyatoslav Ryhel <clamor95@...il.com> # TF201 T30
Tested-by: Robert Eckelmann <longnoserob@...il.com> # TF101 T20
Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
Reviewed-by: Dmitry Osipenko <digetx@...il.com>
---
Changes since V2:
- use CONFIG_PM_SLEEP ifdefs

Changes since V1:
- Added tested-by info from testers
- Patch itself is same, it had no review for 3 weeks
- Test robot is triggering for pm_sleep_ptr, should not it be used to omit CONFIG_PM_SLEEP ifdefs?

 drivers/gpio/gpio-tegra.c | 60 ++++++++++++++++++++++++++++-----------
 1 file changed, 44 insertions(+), 16 deletions(-)

diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index e4fb4cb38a0f..5b265a6fd3c1 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -18,6 +18,7 @@
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/module.h>
+#include <linux/seq_file.h>
 #include <linux/irqdomain.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/pinctrl/consumer.h>
@@ -94,7 +95,6 @@ struct tegra_gpio_info {
 	struct tegra_gpio_bank			*bank_info;
 	const struct tegra_gpio_soc_config	*soc;
 	struct gpio_chip			gc;
-	struct irq_chip				ic;
 	u32					bank_count;
 	unsigned int				*irqs;
 };
@@ -288,6 +288,7 @@ static void tegra_gpio_irq_mask(struct irq_data *d)
 	unsigned int gpio = d->hwirq;
 
 	tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0);
+	gpiochip_disable_irq(chip, gpio);
 }
 
 static void tegra_gpio_irq_unmask(struct irq_data *d)
@@ -296,6 +297,7 @@ static void tegra_gpio_irq_unmask(struct irq_data *d)
 	struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
 	unsigned int gpio = d->hwirq;
 
+	gpiochip_enable_irq(chip, gpio);
 	tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1);
 }
 
@@ -598,10 +600,47 @@ static void tegra_gpio_irq_release_resources(struct irq_data *d)
 	tegra_gpio_enable(tgi, d->hwirq);
 }
 
+static void tegra_gpio_irq_print_chip(struct irq_data *d, struct seq_file *s)
+{
+	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+
+	seq_printf(s, dev_name(chip->parent));
+}
+
+static const struct irq_chip tegra_gpio_irq_chip = {
+	.irq_shutdown		= tegra_gpio_irq_shutdown,
+	.irq_ack		= tegra_gpio_irq_ack,
+	.irq_mask		= tegra_gpio_irq_mask,
+	.irq_unmask		= tegra_gpio_irq_unmask,
+	.irq_set_type		= tegra_gpio_irq_set_type,
+#ifdef CONFIG_PM_SLEEP
+	.irq_set_wake		= tegra_gpio_irq_set_wake,
+#endif
+	.irq_print_chip		= tegra_gpio_irq_print_chip,
+	.irq_request_resources	= tegra_gpio_irq_request_resources,
+	.irq_release_resources	= tegra_gpio_irq_release_resources,
+	.flags			= IRQCHIP_IMMUTABLE,
+};
+
+static const struct irq_chip tegra210_gpio_irq_chip = {
+	.irq_shutdown		= tegra_gpio_irq_shutdown,
+	.irq_ack		= tegra_gpio_irq_ack,
+	.irq_mask		= tegra_gpio_irq_mask,
+	.irq_unmask		= tegra_gpio_irq_unmask,
+	.irq_set_affinity	= tegra_gpio_irq_set_affinity,
+	.irq_set_type		= tegra_gpio_irq_set_type,
+#ifdef CONFIG_PM_SLEEP
+	.irq_set_wake		= tegra_gpio_irq_set_wake,
+#endif
+	.irq_print_chip		= tegra_gpio_irq_print_chip,
+	.irq_request_resources	= tegra_gpio_irq_request_resources,
+	.irq_release_resources	= tegra_gpio_irq_release_resources,
+	.flags			= IRQCHIP_IMMUTABLE,
+};
+
 #ifdef	CONFIG_DEBUG_FS
 
 #include <linux/debugfs.h>
-#include <linux/seq_file.h>
 
 static int tegra_dbg_gpio_show(struct seq_file *s, void *unused)
 {
@@ -689,18 +728,6 @@ static int tegra_gpio_probe(struct platform_device *pdev)
 	tgi->gc.ngpio			= tgi->bank_count * 32;
 	tgi->gc.parent			= &pdev->dev;
 
-	tgi->ic.name			= "GPIO";
-	tgi->ic.irq_ack			= tegra_gpio_irq_ack;
-	tgi->ic.irq_mask		= tegra_gpio_irq_mask;
-	tgi->ic.irq_unmask		= tegra_gpio_irq_unmask;
-	tgi->ic.irq_set_type		= tegra_gpio_irq_set_type;
-	tgi->ic.irq_shutdown		= tegra_gpio_irq_shutdown;
-#ifdef CONFIG_PM_SLEEP
-	tgi->ic.irq_set_wake		= tegra_gpio_irq_set_wake;
-#endif
-	tgi->ic.irq_request_resources	= tegra_gpio_irq_request_resources;
-	tgi->ic.irq_release_resources	= tegra_gpio_irq_release_resources;
-
 	platform_set_drvdata(pdev, tgi);
 
 	if (tgi->soc->debounce_supported)
@@ -733,7 +760,6 @@ static int tegra_gpio_probe(struct platform_device *pdev)
 	}
 
 	irq = &tgi->gc.irq;
-	irq->chip = &tgi->ic;
 	irq->fwnode = of_node_to_fwnode(pdev->dev.of_node);
 	irq->child_to_parent_hwirq = tegra_gpio_child_to_parent_hwirq;
 	irq->populate_parent_alloc_arg = tegra_gpio_populate_parent_fwspec;
@@ -752,7 +778,9 @@ static int tegra_gpio_probe(struct platform_device *pdev)
 		if (!irq->parent_domain)
 			return -EPROBE_DEFER;
 
-		tgi->ic.irq_set_affinity = tegra_gpio_irq_set_affinity;
+		gpio_irq_chip_set_chip(irq, &tegra210_gpio_irq_chip);
+	} else {
+		gpio_irq_chip_set_chip(irq, &tegra_gpio_irq_chip);
 	}
 
 	tgi->regs = devm_platform_ioremap_resource(pdev, 0);
-- 
2.34.1