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Subject[PATCH v2 3/3] pinctrl: upboard: Add UP2 pinctrl and gpio driver
Date
From: Javier Arteaga <javier@emutex.com>

The UP2 board features a Raspberry Pi compatible pin header (HAT) and a
board-specific expansion connector (EXHAT). Both expose assorted
functions from either the SoC (such as GPIO, I2C, SPI, UART...) or other
on-board devices (ADC, FPGA IP blocks...).

These lines are routed through an on-board FPGA. The platform controller
in its stock firmware provides register fields to change:

- Line enable (FPGA pins enabled / high impedance)
- Line direction (SoC driven / FPGA driven)

To enable using SoC GPIOs on the pin header, this arrangement requires
both configuring the platform controller, and updating the SoC pad
registers in sync.

Add a frontend pinctrl/GPIO driver that registers a new set of GPIO
lines for the header pins. When these are requested, the driver
propagates this request to the backend SoC pinctrl/GPIO driver by
grabbing a GPIO descriptor for the matching SoC GPIO line. The needed
mapping for this is retrieved via ACPI properties.

Signed-off-by: Javier Arteaga <javier@emutex.com>
Signed-off-by: Dan O'Donovan <dan@emutex.com>
---
drivers/pinctrl/Kconfig | 13 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-upboard.c | 519 ++++++++++++++++++++++++++++++++++++++
3 files changed, 533 insertions(+)
create mode 100644 drivers/pinctrl/pinctrl-upboard.c

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index e86752b..c65438f 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -338,6 +338,19 @@ config PINCTRL_OCELOT
select GENERIC_PINMUX_FUNCTIONS
select REGMAP_MMIO

+config PINCTRL_UPBOARD
+ tristate "UP Squared pinctrl and GPIO driver"
+ depends on ACPI
+ depends on MFD_UPBOARD
+ select PINMUX
+ help
+ Pinctrl driver for the pin headers on the UP Squared board. It
+ handles pin control for lines routed through the on-board FPGA and
+ propagates changes to the SoC pinctrl to keep them in sync.
+
+ This driver can also be built as a module. If so, the module will be
+ called pinctrl-upboard.
+
source "drivers/pinctrl/actions/Kconfig"
source "drivers/pinctrl/aspeed/Kconfig"
source "drivers/pinctrl/bcm/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 46ef9bd..cfe59b7 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_PINCTRL_ZYNQ) += pinctrl-zynq.o
obj-$(CONFIG_PINCTRL_INGENIC) += pinctrl-ingenic.o
obj-$(CONFIG_PINCTRL_RK805) += pinctrl-rk805.o
obj-$(CONFIG_PINCTRL_OCELOT) += pinctrl-ocelot.o
+obj-$(CONFIG_PINCTRL_UPBOARD) += pinctrl-upboard.o

obj-y += actions/
obj-$(CONFIG_ARCH_ASPEED) += aspeed/
diff --git a/drivers/pinctrl/pinctrl-upboard.c b/drivers/pinctrl/pinctrl-upboard.c
new file mode 100644
index 0000000..b74383b
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-upboard.c
@@ -0,0 +1,519 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// UP Board pin controller driver
+//
+// Copyright (c) 2018, Emutex Ltd.
+//
+// Authors: Javier Arteaga <javier@emutex.com>
+// Dan O'Donovan <dan@emutex.com>
+//
+
+#include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/kernel.h>
+#include <linux/mfd/upboard.h>
+#include <linux/module.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/string.h>
+
+#include "core.h"
+
+struct upboard_pin {
+ struct regmap_field *func_en;
+ struct regmap_field *gpio_en;
+ struct regmap_field *gpio_dir;
+};
+
+struct upboard_pinctrl {
+ struct pinctrl_dev *pctldev;
+ struct gpio_chip chip;
+ unsigned int nsoc_gpios;
+ struct gpio_desc **soc_gpios;
+};
+
+enum upboard_func0_enables {
+ UPBOARD_I2C0_EN = 8,
+ UPBOARD_I2C1_EN = 9,
+};
+
+static const struct reg_field upboard_i2c0_reg =
+ REG_FIELD(UPBOARD_REG_FUNC_EN0, UPBOARD_I2C0_EN, UPBOARD_I2C0_EN);
+
+static const struct reg_field upboard_i2c1_reg =
+ REG_FIELD(UPBOARD_REG_FUNC_EN0, UPBOARD_I2C1_EN, UPBOARD_I2C1_EN);
+
+#define UPBOARD_BIT_TO_PIN(r, bit) \
+ ((r) * UPBOARD_REGISTER_SIZE + (bit))
+
+/*
+ * UP Squared data
+ */
+
+#define UPBOARD_UP2_BIT_TO_PIN(r, id) (UPBOARD_BIT_TO_PIN(r, UPBOARD_UP2_##id))
+
+#define UPBOARD_UP2_PIN_ANON(r, bit) \
+ { \
+ .number = UPBOARD_BIT_TO_PIN(r, bit), \
+ }
+
+#define UPBOARD_UP2_PIN_NAME(r, id) \
+ { \
+ .number = UPBOARD_UP2_BIT_TO_PIN(r, id), \
+ .name = #id, \
+ }
+
+#define UPBOARD_UP2_PIN_FUNC(r, id, data) \
+ { \
+ .number = UPBOARD_UP2_BIT_TO_PIN(r, id), \
+ .name = #id, \
+ .drv_data = (void *)(data), \
+ }
+
+enum upboard_up2_reg0_bit {
+ UPBOARD_UP2_UART1_TXD,
+ UPBOARD_UP2_UART1_RXD,
+ UPBOARD_UP2_UART1_RTS,
+ UPBOARD_UP2_UART1_CTS,
+ UPBOARD_UP2_GPIO3,
+ UPBOARD_UP2_GPIO5,
+ UPBOARD_UP2_GPIO6,
+ UPBOARD_UP2_GPIO11,
+ UPBOARD_UP2_EXHAT_LVDS1n,
+ UPBOARD_UP2_EXHAT_LVDS1p,
+ UPBOARD_UP2_SPI2_TXD,
+ UPBOARD_UP2_SPI2_RXD,
+ UPBOARD_UP2_SPI2_FS1,
+ UPBOARD_UP2_SPI2_FS0,
+ UPBOARD_UP2_SPI2_CLK,
+ UPBOARD_UP2_SPI1_TXD,
+};
+
+enum upboard_up2_reg1_bit {
+ UPBOARD_UP2_SPI1_RXD,
+ UPBOARD_UP2_SPI1_FS1,
+ UPBOARD_UP2_SPI1_FS0,
+ UPBOARD_UP2_SPI1_CLK,
+ UPBOARD_UP2_BIT20,
+ UPBOARD_UP2_BIT21,
+ UPBOARD_UP2_BIT22,
+ UPBOARD_UP2_BIT23,
+ UPBOARD_UP2_PWM1,
+ UPBOARD_UP2_PWM0,
+ UPBOARD_UP2_EXHAT_LVDS0n,
+ UPBOARD_UP2_EXHAT_LVDS0p,
+ UPBOARD_UP2_I2C0_SCL,
+ UPBOARD_UP2_I2C0_SDA,
+ UPBOARD_UP2_I2C1_SCL,
+ UPBOARD_UP2_I2C1_SDA,
+};
+
+enum upboard_up2_reg2_bit {
+ UPBOARD_UP2_EXHAT_LVDS3n,
+ UPBOARD_UP2_EXHAT_LVDS3p,
+ UPBOARD_UP2_EXHAT_LVDS4n,
+ UPBOARD_UP2_EXHAT_LVDS4p,
+ UPBOARD_UP2_EXHAT_LVDS5n,
+ UPBOARD_UP2_EXHAT_LVDS5p,
+ UPBOARD_UP2_I2S_SDO,
+ UPBOARD_UP2_I2S_SDI,
+ UPBOARD_UP2_I2S_WS_SYNC,
+ UPBOARD_UP2_I2S_BCLK,
+ UPBOARD_UP2_EXHAT_LVDS6n,
+ UPBOARD_UP2_EXHAT_LVDS6p,
+ UPBOARD_UP2_EXHAT_LVDS7n,
+ UPBOARD_UP2_EXHAT_LVDS7p,
+ UPBOARD_UP2_EXHAT_LVDS2n,
+ UPBOARD_UP2_EXHAT_LVDS2p,
+};
+
+static struct pinctrl_pin_desc upboard_up2_pins[] = {
+ UPBOARD_UP2_PIN_NAME(0, UART1_TXD),
+ UPBOARD_UP2_PIN_NAME(0, UART1_RXD),
+ UPBOARD_UP2_PIN_NAME(0, UART1_RTS),
+ UPBOARD_UP2_PIN_NAME(0, UART1_CTS),
+ UPBOARD_UP2_PIN_NAME(0, GPIO3),
+ UPBOARD_UP2_PIN_NAME(0, GPIO5),
+ UPBOARD_UP2_PIN_NAME(0, GPIO6),
+ UPBOARD_UP2_PIN_NAME(0, GPIO11),
+ UPBOARD_UP2_PIN_NAME(0, EXHAT_LVDS1n),
+ UPBOARD_UP2_PIN_NAME(0, EXHAT_LVDS1p),
+ UPBOARD_UP2_PIN_NAME(0, SPI2_TXD),
+ UPBOARD_UP2_PIN_NAME(0, SPI2_RXD),
+ UPBOARD_UP2_PIN_NAME(0, SPI2_FS1),
+ UPBOARD_UP2_PIN_NAME(0, SPI2_FS0),
+ UPBOARD_UP2_PIN_NAME(0, SPI2_CLK),
+ UPBOARD_UP2_PIN_NAME(0, SPI1_TXD),
+ UPBOARD_UP2_PIN_NAME(1, SPI1_RXD),
+ UPBOARD_UP2_PIN_NAME(1, SPI1_FS1),
+ UPBOARD_UP2_PIN_NAME(1, SPI1_FS0),
+ UPBOARD_UP2_PIN_NAME(1, SPI1_CLK),
+ UPBOARD_UP2_PIN_ANON(1, 4),
+ UPBOARD_UP2_PIN_ANON(1, 5),
+ UPBOARD_UP2_PIN_ANON(1, 6),
+ UPBOARD_UP2_PIN_ANON(1, 7),
+ UPBOARD_UP2_PIN_NAME(1, PWM1),
+ UPBOARD_UP2_PIN_NAME(1, PWM0),
+ UPBOARD_UP2_PIN_NAME(1, EXHAT_LVDS0n),
+ UPBOARD_UP2_PIN_NAME(1, EXHAT_LVDS0p),
+ UPBOARD_UP2_PIN_FUNC(1, I2C0_SCL, &upboard_i2c0_reg),
+ UPBOARD_UP2_PIN_FUNC(1, I2C0_SDA, &upboard_i2c0_reg),
+ UPBOARD_UP2_PIN_FUNC(1, I2C1_SCL, &upboard_i2c1_reg),
+ UPBOARD_UP2_PIN_FUNC(1, I2C1_SDA, &upboard_i2c1_reg),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS3n),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS3p),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS4n),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS4p),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS5n),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS5p),
+ UPBOARD_UP2_PIN_NAME(2, I2S_SDO),
+ UPBOARD_UP2_PIN_NAME(2, I2S_SDI),
+ UPBOARD_UP2_PIN_NAME(2, I2S_WS_SYNC),
+ UPBOARD_UP2_PIN_NAME(2, I2S_BCLK),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS6n),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS6p),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS7n),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS7p),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS2n),
+ UPBOARD_UP2_PIN_NAME(2, EXHAT_LVDS2p),
+};
+
+static int upboard_get_functions_count(struct pinctrl_dev *pctldev)
+{
+ return 0;
+}
+
+static int upboard_get_function_groups(struct pinctrl_dev *pctldev,
+ unsigned int selector,
+ const char * const **groups,
+ unsigned int *num_groups)
+{
+ *groups = NULL;
+ *num_groups = 0;
+ return 0;
+}
+
+static const char *upboard_get_function_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ return NULL;
+}
+
+static int upboard_set_mux(struct pinctrl_dev *pctldev, unsigned int function,
+ unsigned int group)
+{
+ return 0;
+}
+
+static int upboard_gpio_request_enable(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int pin)
+{
+ const struct pin_desc * const pd = pin_desc_get(pctldev, pin);
+ const struct upboard_pin *p;
+ int ret;
+
+ if (!pd)
+ return -EINVAL;
+ p = pd->drv_data;
+
+ /* if this pin has an associated function bit, disable it first */
+ if (p->func_en) {
+ ret = regmap_field_write(p->func_en, 0);
+ if (ret)
+ return ret;
+ }
+
+ if (p->gpio_en) {
+ ret = regmap_field_write(p->gpio_en, 1);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int upboard_gpio_set_direction(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int pin, bool input)
+{
+ const struct pin_desc * const pd = pin_desc_get(pctldev, pin);
+ const struct upboard_pin *p;
+
+ if (!pd)
+ return -EINVAL;
+ p = pd->drv_data;
+
+ return regmap_field_write(p->gpio_dir, input);
+}
+
+static const struct pinmux_ops upboard_pinmux_ops = {
+ .get_functions_count = upboard_get_functions_count,
+ .get_function_groups = upboard_get_function_groups,
+ .get_function_name = upboard_get_function_name,
+ .set_mux = upboard_set_mux,
+ .gpio_request_enable = upboard_gpio_request_enable,
+ .gpio_set_direction = upboard_gpio_set_direction,
+};
+
+static int upboard_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ return 0;
+}
+
+static const char *upboard_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ return NULL;
+}
+
+static const struct pinctrl_ops upboard_pinctrl_ops = {
+ .get_groups_count = upboard_get_groups_count,
+ .get_group_name = upboard_get_group_name,
+};
+
+static struct pinctrl_desc upboard_up2_pinctrl_desc = {
+ .pins = upboard_up2_pins,
+ .npins = ARRAY_SIZE(upboard_up2_pins),
+ .pctlops = &upboard_pinctrl_ops,
+ .pmxops = &upboard_pinmux_ops,
+ .owner = THIS_MODULE,
+};
+
+static struct gpio_desc *upboard_offset_to_soc_gpio(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ struct upboard_pinctrl *pctrl =
+ container_of(gc, struct upboard_pinctrl, chip);
+
+ if (offset + 1 > pctrl->nsoc_gpios || !pctrl->soc_gpios[offset])
+ return ERR_PTR(-ENODEV);
+
+ return pctrl->soc_gpios[offset];
+}
+
+static int upboard_gpio_request(struct gpio_chip *gc, unsigned int offset)
+{
+ struct upboard_pinctrl *pctrl =
+ container_of(gc, struct upboard_pinctrl, chip);
+ struct gpio_desc *desc;
+ int ret;
+
+ ret = pinctrl_gpio_request(gc->base + offset);
+ if (ret)
+ return ret;
+
+ desc = devm_gpiod_get_index(gc->parent, "external", offset, GPIOD_ASIS);
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+
+ pctrl->soc_gpios[offset] = desc;
+ return 0;
+}
+
+static void upboard_gpio_free(struct gpio_chip *gc, unsigned int offset)
+{
+ struct upboard_pinctrl *pctrl =
+ container_of(gc, struct upboard_pinctrl, chip);
+
+ if (offset + 1 > pctrl->nsoc_gpios || !pctrl->soc_gpios[offset])
+ return;
+
+ devm_gpiod_put(gc->parent, pctrl->soc_gpios[offset]);
+ pctrl->soc_gpios[offset] = NULL;
+
+ pinctrl_gpio_free(gc->base + offset);
+}
+
+static int upboard_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+ struct gpio_desc *desc = upboard_offset_to_soc_gpio(gc, offset);
+
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+
+ return gpiod_get_direction(desc);
+}
+
+static int upboard_gpio_direction_input(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ struct gpio_desc *desc = upboard_offset_to_soc_gpio(gc, offset);
+ int ret;
+
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+
+ ret = gpiod_direction_input(desc);
+ if (ret)
+ return ret;
+
+ return pinctrl_gpio_direction_input(gc->base + offset);
+}
+
+static int upboard_gpio_direction_output(struct gpio_chip *gc,
+ unsigned int offset, int value)
+{
+ struct gpio_desc *desc = upboard_offset_to_soc_gpio(gc, offset);
+ int ret;
+
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+
+ ret = pinctrl_gpio_direction_output(gc->base + offset);
+ if (ret)
+ return ret;
+
+ return gpiod_direction_output(desc, value);
+}
+
+static int upboard_gpio_get_value(struct gpio_chip *gc, unsigned int offset)
+{
+ struct gpio_desc *desc = upboard_offset_to_soc_gpio(gc, offset);
+
+ if (IS_ERR(desc))
+ return PTR_ERR(desc);
+
+ return gpiod_get_value(desc);
+}
+
+static void upboard_gpio_set_value(struct gpio_chip *gc, unsigned int offset,
+ int value)
+{
+ struct gpio_desc *desc = upboard_offset_to_soc_gpio(gc, offset);
+
+ if (IS_ERR(desc))
+ return;
+
+ gpiod_set_value(desc, value);
+}
+
+static struct gpio_chip upboard_gpio_chip = {
+ .label = "UP pin controller",
+ .owner = THIS_MODULE,
+ .request = upboard_gpio_request,
+ .free = upboard_gpio_free,
+ .get_direction = upboard_gpio_get_direction,
+ .direction_input = upboard_gpio_direction_input,
+ .direction_output = upboard_gpio_direction_output,
+ .get = upboard_gpio_get_value,
+ .set = upboard_gpio_set_value,
+ .base = -1,
+};
+
+static struct regmap_field *upboard_field_alloc(struct device *dev,
+ struct regmap *regmap,
+ unsigned int base,
+ unsigned int number)
+{
+ const unsigned int reg = number / UPBOARD_REGISTER_SIZE;
+ const unsigned int bit = number % UPBOARD_REGISTER_SIZE;
+ const struct reg_field field = {
+ .reg = base + reg,
+ .msb = bit,
+ .lsb = bit,
+ };
+
+ return devm_regmap_field_alloc(dev, regmap, field);
+}
+
+static int upboard_pinctrl_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct pinctrl_desc *pctldesc;
+ struct upboard_pinctrl *pctrl;
+ struct upboard_pin *pins;
+ struct acpi_device *adev;
+ struct regmap *regmap;
+ unsigned int i;
+ int ret;
+
+ adev = ACPI_COMPANION(dev);
+ if (!adev || strcmp(acpi_device_hid(adev), "AANT0F01"))
+ return -ENODEV;
+
+ if (!dev->parent)
+ return -EINVAL;
+
+ regmap = dev_get_regmap(dev->parent, NULL);
+ if (!regmap)
+ return -EINVAL;
+
+ pctldesc = &upboard_up2_pinctrl_desc;
+ pctldesc->name = dev_name(dev);
+
+ pins = devm_kzalloc(dev, sizeof(*pins) * pctldesc->npins, GFP_KERNEL);
+ if (!pins)
+ return -ENOMEM;
+
+ for (i = 0; i < pctldesc->npins; i++) {
+ struct upboard_pin *pin = &pins[i];
+ const struct pinctrl_pin_desc *pd = &pctldesc->pins[i];
+
+ pin->func_en = NULL;
+ if (pd->drv_data) {
+ struct reg_field *field = pd->drv_data;
+
+ pin->func_en = devm_regmap_field_alloc(dev, regmap,
+ *field);
+ if (IS_ERR(pin->func_en))
+ return PTR_ERR(pin->func_en);
+ }
+
+ pin->gpio_en = upboard_field_alloc(dev, regmap,
+ UPBOARD_REG_GPIO_EN0, i);
+ if (IS_ERR(pin->gpio_en))
+ return PTR_ERR(pin->gpio_en);
+
+ pin->gpio_dir = upboard_field_alloc(dev, regmap,
+ UPBOARD_REG_GPIO_DIR0, i);
+ if (IS_ERR(pin->gpio_dir))
+ return PTR_ERR(pin->gpio_dir);
+
+ ((struct pinctrl_pin_desc *)pd)->drv_data = pin;
+ }
+
+ pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
+ if (!pctrl)
+ return -ENOMEM;
+
+ pctrl->chip = upboard_gpio_chip;
+ pctrl->chip.parent = dev;
+ pctrl->chip.ngpio = pctldesc->npins;
+
+ pctrl->nsoc_gpios = gpiod_count(dev, "external");
+ pctrl->soc_gpios = devm_kzalloc(dev,
+ pctrl->nsoc_gpios * sizeof(*pctrl->soc_gpios),
+ GFP_KERNEL);
+ if (!pctrl->soc_gpios)
+ return -ENOMEM;
+
+ pctrl->pctldev = devm_pinctrl_register(dev, pctldesc, pctrl);
+ if (IS_ERR(pctrl->pctldev))
+ return PTR_ERR(pctrl->pctldev);
+
+ ret = devm_gpiochip_add_data(dev, &pctrl->chip, &pctrl->chip);
+ if (ret)
+ return ret;
+
+ return gpiochip_add_pin_range(&pctrl->chip, pctldesc->name, 0, 0,
+ pctldesc->npins);
+}
+
+static struct platform_driver upboard_pinctrl_driver = {
+ .driver = {
+ .name = "upboard-pinctrl",
+ },
+};
+
+module_platform_driver_probe(upboard_pinctrl_driver, upboard_pinctrl_probe);
+
+MODULE_ALIAS("platform:upboard-pinctrl");
+MODULE_AUTHOR("Javier Arteaga <javier@emutex.com>");
+MODULE_AUTHOR("Dan O'Donovan <dan@emutex.com>");
+MODULE_DESCRIPTION("UP Board pin control and GPIO driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4

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