openwrt/target/linux/bcm27xx/patches-4.19/950-0784-pinctrl-bcm2835-Change-init-order-for-gpio-hogs.patch

From 0b3764707993123148b4e94d44ff282b111c8edb Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 6 Jan 2020 14:05:42 +0000
Subject: [PATCH] pinctrl: bcm2835: Change init order for gpio hogs

pinctrl-bcm2835 is a combined pinctrl/gpio driver. Currently the gpio
side is registered first, but this breaks gpio hogs (which are
configured during gpiochip_add_data). Part of the hog initialisation
is a call to pinctrl_gpio_request, and since the pinctrl driver hasn't
yet been registered this results in an -EPROBE_DEFER from which it can
never recover.

Change the initialisation sequence to register the pinctrl driver
first.

See: https://www.raspberrypi.org/forums/viewtopic.php?f=107&t=260600

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 34 +++++++++++++--------------
 1 file changed, 17 insertions(+), 17 deletions(-)

--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -1140,9 +1140,25 @@ static int bcm2835_pinctrl_probe(struct
 		raw_spin_lock_init(&pc->irq_lock[i]);
 	}
 
+	match = of_match_node(bcm2835_pinctrl_match, pdev->dev.of_node);
+	if (match) {
+		bcm2835_pinctrl_desc.confops =
+			(const struct pinconf_ops *)match->data;
+	}
+
+	pc->pctl_dev = devm_pinctrl_register(dev, &bcm2835_pinctrl_desc, pc);
+	if (IS_ERR(pc->pctl_dev))
+		return PTR_ERR(pc->pctl_dev);
+
+	pc->gpio_range = bcm2835_pinctrl_gpio_range;
+	pc->gpio_range.base = pc->gpio_chip.base;
+	pc->gpio_range.gc = &pc->gpio_chip;
+	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
+
 	err = devm_gpiochip_add_data(dev, &pc->gpio_chip, pc);
 	if (err) {
 		dev_err(dev, "could not add GPIO chip\n");
+		pinctrl_remove_gpio_range(pc->pctl_dev, &pc->gpio_range);
 		return err;
 	}
 
@@ -1150,6 +1166,7 @@ static int bcm2835_pinctrl_probe(struct
 				   0, handle_level_irq, IRQ_TYPE_NONE);
 	if (err) {
 		dev_info(dev, "could not add irqchip\n");
+		pinctrl_remove_gpio_range(pc->pctl_dev, &pc->gpio_range);
 		return err;
 	}
 
@@ -1172,23 +1189,6 @@ static int bcm2835_pinctrl_probe(struct
 					     bcm2835_gpio_irq_handler);
 	}
 
-	match = of_match_node(bcm2835_pinctrl_match, pdev->dev.of_node);
-	if (match) {
-		bcm2835_pinctrl_desc.confops =
-			(const struct pinconf_ops *)match->data;
-	}
-
-	pc->pctl_dev = devm_pinctrl_register(dev, &bcm2835_pinctrl_desc, pc);
-	if (IS_ERR(pc->pctl_dev)) {
-		gpiochip_remove(&pc->gpio_chip);
-		return PTR_ERR(pc->pctl_dev);
-	}
-
-	pc->gpio_range = bcm2835_pinctrl_gpio_range;
-	pc->gpio_range.base = pc->gpio_chip.base;
-	pc->gpio_range.gc = &pc->gpio_chip;
-	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
-
 	return 0;
 }