[PATCH] pinctrl: at91: fix deferred probing support
From: robh@kernel.org (Rob Herring)
Date: 2018-07-12 19:22:22
Also in:
linux-gpio
Subsystem:
pin control subsystem, pin controller - microchip at91, the rest · Maintainers:
Linus Walleij, Ludovic Desroches, Linus Torvalds
AT91 pinctrl deferred probing support is broken if the GPIO devices haven't probed first and set gpio_banks to non-zero. The later condition that only some GPIO devices haven't probed can't actually happen as either all the GPIO devices have probed first or none of them have. Plus the pinctrl driver has already returned -EINVAL, so it's not on the deferred list to retry probing. Fix this by consolidating the checking that all GPIO devices are probed. Cc: Jean-Christophe Plagniol-Villard <redacted> Cc: Linus Walleij <redacted> Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: linux-arm-kernel at lists.infradead.org Cc: linux-gpio at vger.kernel.org Signed-off-by: Rob Herring <robh@kernel.org> --- This is a result of trying to remove of_platform_default_populate from at91 code and relying on the DT core handling populating devices. That changed the probe order and broke booting. Compile tested only. Rob drivers/pinctrl/pinctrl-at91.c | 36 ++++++++++++---------------------- 1 file changed, 13 insertions(+), 23 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index 50f0ec42c637..167838901b75 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c@@ -1162,7 +1162,7 @@ static int at91_pinctrl_probe_dt(struct platform_device *pdev, struct at91_pinctrl *info) { int ret = 0; - int i, j; + int i, j, ngpio_chips_enabled = 0; uint32_t *tmp; struct device_node *np = pdev->dev.of_node; struct device_node *child;
@@ -1175,10 +1175,17 @@ static int at91_pinctrl_probe_dt(struct platform_device *pdev, of_match_device(at91_pinctrl_of_match, &pdev->dev)->data; at91_pinctrl_child_count(info, np); - if (gpio_banks < 1) { - dev_err(&pdev->dev, "you need to specify at least one gpio-controller\n"); - return -EINVAL; - } + /* + * We need all the GPIO drivers to probe FIRST, or we will not be able + * to obtain references to the struct gpio_chip * for them, and we + * need this to proceed. + */ + for (i = 0; i < MAX_GPIO_BANKS; i++) + if (gpio_chips[i]) + ngpio_chips_enabled++; + + if (ngpio_chips_enabled < info->nactive_banks) + return -EPROBE_DEFER; ret = at91_pinctrl_mux_mask(info, np); if (ret)
@@ -1234,7 +1241,7 @@ static int at91_pinctrl_probe(struct platform_device *pdev) { struct at91_pinctrl *info; struct pinctrl_pin_desc *pdesc; - int ret, i, j, k, ngpio_chips_enabled = 0; + int ret, i, j, k; info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); if (!info)
@@ -1244,23 +1251,6 @@ static int at91_pinctrl_probe(struct platform_device *pdev) if (ret) return ret; - /* - * We need all the GPIO drivers to probe FIRST, or we will not be able - * to obtain references to the struct gpio_chip * for them, and we - * need this to proceed. - */ - for (i = 0; i < gpio_banks; i++) - if (gpio_chips[i]) - ngpio_chips_enabled++; - - if (ngpio_chips_enabled < info->nactive_banks) { - dev_warn(&pdev->dev, - "All GPIO chips are not registered yet (%d/%d)\n", - ngpio_chips_enabled, info->nactive_banks); - devm_kfree(&pdev->dev, info); - return -EPROBE_DEFER; - } - at91_pinctrl_desc.name = dev_name(&pdev->dev); at91_pinctrl_desc.npins = gpio_banks * MAX_NB_GPIO_PER_BANK; at91_pinctrl_desc.pins = pdesc =
--
2.17.1