diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0784-pinctrl-bcm2835-Change-init-order-for-gpio-hogs.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0784-pinctrl-bcm2835-Change-init-order-for-gpio-hogs.patch | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0784-pinctrl-bcm2835-Change-init-order-for-gpio-hogs.patch b/target/linux/brcm2708/patches-4.19/950-0784-pinctrl-bcm2835-Change-init-order-for-gpio-hogs.patch new file mode 100644 index 0000000000..09166b72e7 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0784-pinctrl-bcm2835-Change-init-order-for-gpio-hogs.patch @@ -0,0 +1,82 @@ +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; + } + |