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@@ -0,0 +1,235 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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+/*
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+ * Copyright (C) 2021, Collabora Ltd.
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+ * Copyright (C) 2021, General Electric Company
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+ * Author(s): Sebastian Reichel <sebastian.reichel@collabora.com>
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+ */
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+
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+#define LOG_CATEGORY UCLASS_GPIO
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+
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+#include <common.h>
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+#include <errno.h>
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+#include <dm.h>
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+#include <i2c.h>
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+#include <asm/gpio.h>
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+#include <dm/device_compat.h>
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+#include <dt-bindings/gpio/gpio.h>
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+
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+enum mcp230xx_type {
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+ UNKNOWN = 0,
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+ MCP23008,
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+ MCP23017,
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+ MCP23018,
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+};
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+
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+#define MCP230XX_IODIR 0x00
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+#define MCP230XX_GPPU 0x06
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+#define MCP230XX_GPIO 0x09
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+#define MCP230XX_OLAT 0x0a
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+
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+#define BANKSIZE 8
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+
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+static int mcp230xx_read(struct udevice *dev, uint reg, uint offset)
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+{
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+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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+ int bank = offset / BANKSIZE;
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+ int mask = 1 << (offset % BANKSIZE);
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+ int shift = (uc_priv->gpio_count / BANKSIZE) - 1;
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+ int ret;
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+
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+ ret = dm_i2c_reg_read(dev, (reg << shift) | bank);
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+ if (ret < 0)
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+ return ret;
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+
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+ return !!(ret & mask);
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+}
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+
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+static int mcp230xx_write(struct udevice *dev, uint reg, uint offset, bool val)
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+{
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+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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+ int bank = offset / BANKSIZE;
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+ int mask = 1 << (offset % BANKSIZE);
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+ int shift = (uc_priv->gpio_count / BANKSIZE) - 1;
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+
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+ return dm_i2c_reg_clrset(dev, (reg << shift) | bank, mask, val ? mask : 0);
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+}
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+
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+static int mcp230xx_get_value(struct udevice *dev, uint offset)
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+{
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+ int ret;
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+
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+ ret = mcp230xx_read(dev, MCP230XX_GPIO, offset);
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+ if (ret < 0) {
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+ dev_err(dev, "%s error: %d\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ return ret;
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+}
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+
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+static int mcp230xx_set_value(struct udevice *dev, uint offset, int val)
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+{
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+ int ret;
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+
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+ ret = mcp230xx_write(dev, MCP230XX_GPIO, offset, val);
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+ if (ret < 0) {
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+ dev_err(dev, "%s error: %d\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ return ret;
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+}
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+
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+static int mcp230xx_get_flags(struct udevice *dev, unsigned int offset,
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+ ulong *flags)
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+{
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+ int direction, pullup;
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+
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+ pullup = mcp230xx_read(dev, MCP230XX_GPPU, offset);
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+ if (pullup < 0) {
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+ dev_err(dev, "%s error: %d\n", __func__, pullup);
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+ return pullup;
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+ }
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+
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+ direction = mcp230xx_read(dev, MCP230XX_IODIR, offset);
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+ if (direction < 0) {
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+ dev_err(dev, "%s error: %d\n", __func__, direction);
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+ return direction;
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+ }
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+
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+ *flags = direction ? GPIOD_IS_IN : GPIOD_IS_OUT;
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+
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+ if (pullup)
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+ *flags |= GPIOD_PULL_UP;
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+
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+ return 0;
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+}
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+
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+static int mcp230xx_set_flags(struct udevice *dev, uint offset, ulong flags)
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+{
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+ bool input = !(flags & (GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE));
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+ bool pullup = flags & GPIOD_PULL_UP;
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+ ulong supported_mask;
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+ int ret;
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+
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+ /* Note: active-low is ignored (handled by core) */
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+ supported_mask = GPIOD_ACTIVE_LOW | GPIOD_MASK_DIR | GPIOD_PULL_UP;
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+ if (flags & ~supported_mask) {
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+ dev_err(dev, "%s unsupported flag(s): %lx\n", __func__, flags);
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+ return -EINVAL;
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+ }
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+
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+ ret = mcp230xx_write(dev, MCP230XX_OLAT, offset, !!(flags & GPIOD_IS_OUT_ACTIVE));
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+ if (ret) {
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+ dev_err(dev, "%s failed to setup output latch: %d\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ ret = mcp230xx_write(dev, MCP230XX_GPPU, offset, pullup);
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+ if (ret) {
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+ dev_err(dev, "%s failed to setup pull-up: %d\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ ret = mcp230xx_write(dev, MCP230XX_IODIR, offset, input);
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+ if (ret) {
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+ dev_err(dev, "%s failed to setup direction: %d\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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+static int mcp230xx_direction_input(struct udevice *dev, uint offset)
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+{
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+ return mcp230xx_set_flags(dev, offset, GPIOD_IS_IN);
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+}
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+
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+static int mcp230xx_direction_output(struct udevice *dev, uint offset, int val)
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+{
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+ int ret = mcp230xx_set_value(dev, offset, val);
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+ if (ret < 0) {
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+ dev_err(dev, "%s error: %d\n", __func__, ret);
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+ return ret;
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+ }
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+ return mcp230xx_set_flags(dev, offset, GPIOD_IS_OUT);
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+}
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+
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+static int mcp230xx_get_function(struct udevice *dev, uint offset)
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+{
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+ int ret;
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+
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+ ret = mcp230xx_read(dev, MCP230XX_IODIR, offset);
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+ if (ret < 0) {
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+ dev_err(dev, "%s error: %d\n", __func__, ret);
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+ return ret;
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+ }
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+
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+ return ret ? GPIOF_INPUT : GPIOF_OUTPUT;
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+}
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+
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+static const struct dm_gpio_ops mcp230xx_ops = {
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+ .direction_input = mcp230xx_direction_input,
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+ .direction_output = mcp230xx_direction_output,
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+ .get_value = mcp230xx_get_value,
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+ .set_value = mcp230xx_set_value,
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+ .get_function = mcp230xx_get_function,
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+ .set_flags = mcp230xx_set_flags,
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+ .get_flags = mcp230xx_get_flags,
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+};
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+
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+static int mcp230xx_probe(struct udevice *dev)
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+{
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+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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+ char name[32], label[8], *str;
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+ int addr, gpio_count, size;
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+ const u8 *tmp;
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+
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+ switch (dev_get_driver_data(dev)) {
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+ case MCP23008:
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+ gpio_count = 8;
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+ break;
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+ case MCP23017:
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+ case MCP23018:
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+ gpio_count = 16;
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+ break;
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+ default:
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+ return -ENODEV;
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+ }
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+
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+ addr = dev_read_addr(dev);
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+ tmp = dev_read_prop(dev, "label", &size);
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+ if (tmp) {
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+ memcpy(label, tmp, sizeof(label) - 1);
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+ label[sizeof(label) - 1] = '\0';
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+ snprintf(name, sizeof(name), "%s@%x_", label, addr);
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+ } else {
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+ snprintf(name, sizeof(name), "gpio@%x_", addr);
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+ }
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+
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+ str = strdup(name);
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+ if (!str)
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+ return -ENOMEM;
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+
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+ uc_priv->bank_name = str;
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+ uc_priv->gpio_count = gpio_count;
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+
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+ dev_dbg(dev, "%s is ready\n", str);
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+
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+ return 0;
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+}
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+
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+static const struct udevice_id mcp230xx_ids[] = {
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+ { .compatible = "microchip,mcp23008", .data = MCP23008, },
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+ { .compatible = "microchip,mcp23017", .data = MCP23017, },
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+ { .compatible = "microchip,mcp23018", .data = MCP23018, },
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+ { }
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+};
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+
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+U_BOOT_DRIVER(mcp230xx) = {
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+ .name = "mcp230xx",
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+ .id = UCLASS_GPIO,
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+ .ops = &mcp230xx_ops,
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+ .probe = mcp230xx_probe,
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+ .of_match = mcp230xx_ids,
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+};
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