--- /dev/null
+From: Christian Lamparter <chunkeey@gmail.com>
+Date: Thu, 12 Apr 2018 21:01:38 +0200
+Subject: [PATCH] pinctrl: msm: fix gpio-hog related boot issues
+
+Sven Eckelmann reported an issue with the current IPQ4019 pinctrl.
+Setting up any gpio-hog in the device-tree for his device would
+"kill the bootup completely":
+
+| [ 0.477838] msm_serial 78af000.serial: could not find pctldev for node /soc/pinctrl@1000000/serial_pinmux, deferring probe
+| [ 0.499828] spi_qup 78b5000.spi: could not find pctldev for node /soc/pinctrl@1000000/spi_0_pinmux, deferring probe
+| [ 1.298883] requesting hog GPIO enable USB2 power (chip 1000000.pinctrl, offset 58) failed, -517
+| [ 1.299609] gpiochip_add_data: GPIOs 0..99 (1000000.pinctrl) failed to register
+| [ 1.308589] ipq4019-pinctrl 1000000.pinctrl: Failed register gpiochip
+| [ 1.316586] msm_serial 78af000.serial: could not find pctldev for node /soc/pinctrl@1000000/serial_pinmux, deferring probe
+| [ 1.322415] spi_qup 78b5000.spi: could not find pctldev for node /soc/pinctrl@1000000/spi_0_pinmux, deferri
+
+This was also verified on a RT-AC58U (IPQ4018) which would
+no longer boot, if a gpio-hog was specified. (Tried forcing
+the USB LED PIN (GPIO0) to high.).
+
+The problem is that Pinctrl+GPIO registration is currently
+peformed in the following order in pinctrl-msm.c:
+ 1. pinctrl_register()
+ 2. gpiochip_add()
+ 3. gpiochip_add_pin_range()
+
+The actual error code -517 == -EPROBE_DEFER is coming from
+pinctrl_get_device_gpio_range(), which is called through:
+ gpiochip_add
+ of_gpiochip_add
+ of_gpiochip_scan_gpios
+ gpiod_hog
+ gpiochip_request_own_desc
+ __gpiod_request
+ chip->request
+ gpiochip_generic_request
+ pinctrl_gpio_request
+ pinctrl_get_device_gpio_range
+
+pinctrl_get_device_gpio_range() is unable to find any valid
+pin ranges, since nothing has been added to the pinctrldev_list yet.
+so the range can't be found, and the operation fails with -EPROBE_DEFER.
+
+This patch fixes the issue by adding the "gpio-ranges" property to
+the pinctrl device node of all upstream Qcom SoC. The pin ranges are
+then added by the gpio core.
+
+In order to remain compatible with older, existing DTs (and ACPI)
+a check for the "gpio-ranges" property has been added to
+msm_gpio_init(). This prevents the driver of adding the same entry
+to the pinctrldev_list twice.
+
+Reported-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
+Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
+
+Origin: other, https://patchwork.kernel.org/patch/10339127/
+---
+ arch/arm/boot/dts/qcom-ipq4019.dtsi | 1 +
+ drivers/pinctrl/qcom/pinctrl-msm.c | 23 ++++++++++++++++++-----
+ 14 files changed, 32 insertions(+), 6 deletions(-)
+
+--- a/arch/arm/boot/dts/qcom-ipq4019.dtsi
++++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi
+@@ -166,6 +166,7 @@
+ compatible = "qcom,ipq4019-pinctrl";
+ reg = <0x01000000 0x300000>;
+ gpio-controller;
++ gpio-ranges = <&tlmm 0 0 100>;
+ #gpio-cells = <2>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+--- a/drivers/pinctrl/qcom/pinctrl-msm.c
++++ b/drivers/pinctrl/qcom/pinctrl-msm.c
+@@ -831,11 +831,24 @@ static int msm_gpio_init(struct msm_pinc
+ return ret;
+ }
+
+- ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), 0, 0, chip->ngpio);
+- if (ret) {
+- dev_err(pctrl->dev, "Failed to add pin range\n");
+- gpiochip_remove(&pctrl->chip);
+- return ret;
++ /*
++ * For DeviceTree-supported systems, the gpio core checks the
++ * pinctrl's device node for the "gpio-ranges" property.
++ * If it is present, it takes care of adding the pin ranges
++ * for the driver. In this case the driver can skip ahead.
++ *
++ * In order to remain compatible with older, existing DeviceTree
++ * files which don't set the "gpio-ranges" property or systems that
++ * utilize ACPI the driver has to call gpiochip_add_pin_range().
++ */
++ if (!of_property_read_bool(pctrl->dev->of_node, "gpio-ranges")) {
++ ret = gpiochip_add_pin_range(&pctrl->chip,
++ dev_name(pctrl->dev), 0, 0, chip->ngpio);
++ if (ret) {
++ dev_err(pctrl->dev, "Failed to add pin range\n");
++ gpiochip_remove(&pctrl->chip);
++ return ret;
++ }
+ }
+
+ ret = gpiochip_irqchip_add(chip,
projects / openwrt / staging / adrian.git / commitdiff