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The MCP23x port expander RESET# line can be connected to a host GPIO. The optional reset-gpio must be set to LOW if the reset is asserted at probing time. On page 5 in the datasheet [0] the "Device Active After Reset high" time is specified at 0 µs. Therefore no waiting is needed after the reset transition. [0] https://ww1.microchip.com/downloads/en/DeviceDoc/20001952C.pdf Signed-off-by: Andreas Kaessens <akaessens@gmail.com> Signed-off-by: Darian Biastoch <d.biastoch@gmail.com> Link: https://lore.kernel.org/r/20210610132438.3085841-1-akaessens@gmail.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* MCP23S08 SPI/I2C GPIO driver */
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#include <linux/gpio/driver.h>
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#include <linux/irq.h>
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#include <linux/mutex.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/types.h>
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/*
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* MCP types supported by driver
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*/
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#define MCP_TYPE_S08 1
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#define MCP_TYPE_S17 2
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#define MCP_TYPE_008 3
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#define MCP_TYPE_017 4
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#define MCP_TYPE_S18 5
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#define MCP_TYPE_018 6
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struct device;
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struct regmap;
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struct pinctrl_dev;
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struct mcp23s08 {
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u8 addr;
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bool irq_active_high;
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bool reg_shift;
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u16 irq_rise;
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u16 irq_fall;
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int irq;
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bool irq_controller;
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int cached_gpio;
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/* lock protects regmap access with bypass/cache flags */
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struct mutex lock;
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struct gpio_chip chip;
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struct irq_chip irq_chip;
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struct regmap *regmap;
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struct device *dev;
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struct pinctrl_dev *pctldev;
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struct pinctrl_desc pinctrl_desc;
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struct gpio_desc *reset_gpio;
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};
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extern const struct regmap_config mcp23x08_regmap;
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extern const struct regmap_config mcp23x17_regmap;
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int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
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unsigned int addr, unsigned int type, unsigned int base);
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