b3fdd32799
Based on i2c-mux-gpio driver, similarly the register-based mux switch from one bus to another by setting a single register. The register can be on PCIe bus, local bus, or any memory-mapped address. The endianness of such register can be specified in device tree if used, or in platform data. Signed-off-by: York Sun <yorksun@freescale.com> Acked-by: Alexander Sverdlin <alexander.sverdlin@nokia.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/*
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* I2C multiplexer using a single register
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*
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* Copyright 2015 Freescale Semiconductor
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* York Sun <yorksun@freescale.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#ifndef __LINUX_PLATFORM_DATA_I2C_MUX_REG_H
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#define __LINUX_PLATFORM_DATA_I2C_MUX_REG_H
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/**
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* struct i2c_mux_reg_platform_data - Platform-dependent data for i2c-mux-reg
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* @parent: Parent I2C bus adapter number
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* @base_nr: Base I2C bus number to number adapters from or zero for dynamic
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* @values: Array of value for each channel
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* @n_values: Number of multiplexer channels
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* @little_endian: Indicating if the register is in little endian
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* @write_only: Reading the register is not allowed by hardware
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* @classes: Optional I2C auto-detection classes
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* @idle: Value to write to mux when idle
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* @idle_in_use: indicate if idle value is in use
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* @reg: Virtual address of the register to switch channel
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* @reg_size: register size in bytes
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*/
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struct i2c_mux_reg_platform_data {
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int parent;
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int base_nr;
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const unsigned int *values;
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int n_values;
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bool little_endian;
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bool write_only;
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const unsigned int *classes;
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u32 idle;
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bool idle_in_use;
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void __iomem *reg;
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resource_size_t reg_size;
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};
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#endif /* __LINUX_PLATFORM_DATA_I2C_MUX_REG_H */
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