include/linux/platform_data/i2c-gpio.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * i2c-gpio interface to platform code
   4  *
   5  * Copyright (C) 2007 Atmel Corporation
   6  */
   7 #ifndef _LINUX_I2C_GPIO_H
   8 #define _LINUX_I2C_GPIO_H
   9
  10 /**
  11  * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio
  12  * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz
  13  * @timeout: clock stretching timeout in jiffies. If the slave keeps
  14  *      SCL low for longer than this, the transfer will time out.
  15  * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin
  16  *      isn't actively driven high when setting the output value high.
  17  *      gpio_get_value() must return the actual pin state even if the
  18  *      pin is configured as an output.
  19  * @sda_is_output_only: SDA output drivers can't be turned off.
  20  *      This is for clients that can only read SDA/SCL.
  21  * @sda_has_no_pullup: SDA is used in a non-compliant way and has no pull-up.
  22  *      Therefore disable open-drain.
  23  * @scl_is_open_drain: SCL is set up as open drain. Same requirements
  24  *      as for sda_is_open_drain apply.
  25  * @scl_is_output_only: SCL output drivers cannot be turned off.
  26  * @scl_has_no_pullup: SCL is used in a non-compliant way and has no pull-up.
  27  *      Therefore disable open-drain.
  28  */
  29 struct i2c_gpio_platform_data {
  30         int             udelay;
  31         int             timeout;
  32         unsigned int    sda_is_open_drain:1;
  33         unsigned int    sda_is_output_only:1;
  34         unsigned int    sda_has_no_pullup:1;
  35         unsigned int    scl_is_open_drain:1;
  36         unsigned int    scl_is_output_only:1;
  37         unsigned int    scl_has_no_pullup:1;
  38 };
  39
  40 #endif /* _LINUX_I2C_GPIO_H */