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 */ 41