1d2912cb1SThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-only */ 21e9d4219SWolfram Sang /* 31e9d4219SWolfram Sang * i2c-gpio interface to platform code 41e9d4219SWolfram Sang * 51e9d4219SWolfram Sang * Copyright (C) 2007 Atmel Corporation 61e9d4219SWolfram Sang */ 71e9d4219SWolfram Sang #ifndef _LINUX_I2C_GPIO_H 81e9d4219SWolfram Sang #define _LINUX_I2C_GPIO_H 91e9d4219SWolfram Sang 101e9d4219SWolfram Sang /** 111e9d4219SWolfram Sang * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio 121e9d4219SWolfram Sang * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz 131e9d4219SWolfram Sang * @timeout: clock stretching timeout in jiffies. If the slave keeps 141e9d4219SWolfram Sang * SCL low for longer than this, the transfer will time out. 151e9d4219SWolfram Sang * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin 161e9d4219SWolfram Sang * isn't actively driven high when setting the output value high. 171e9d4219SWolfram Sang * gpio_get_value() must return the actual pin state even if the 181e9d4219SWolfram Sang * pin is configured as an output. 19*8786b095SHeiner Kallweit * @sda_is_output_only: SDA output drivers can't be turned off. 20*8786b095SHeiner Kallweit * This is for clients that can only read SDA/SCL. 21*8786b095SHeiner Kallweit * @sda_has_no_pullup: SDA is used in a non-compliant way and has no pull-up. 22*8786b095SHeiner Kallweit * Therefore disable open-drain. 231e9d4219SWolfram Sang * @scl_is_open_drain: SCL is set up as open drain. Same requirements 241e9d4219SWolfram Sang * as for sda_is_open_drain apply. 251e9d4219SWolfram Sang * @scl_is_output_only: SCL output drivers cannot be turned off. 26*8786b095SHeiner Kallweit * @scl_has_no_pullup: SCL is used in a non-compliant way and has no pull-up. 27*8786b095SHeiner Kallweit * Therefore disable open-drain. 281e9d4219SWolfram Sang */ 291e9d4219SWolfram Sang struct i2c_gpio_platform_data { 301e9d4219SWolfram Sang int udelay; 311e9d4219SWolfram Sang int timeout; 321e9d4219SWolfram Sang unsigned int sda_is_open_drain:1; 33*8786b095SHeiner Kallweit unsigned int sda_is_output_only:1; 34*8786b095SHeiner Kallweit unsigned int sda_has_no_pullup:1; 351e9d4219SWolfram Sang unsigned int scl_is_open_drain:1; 361e9d4219SWolfram Sang unsigned int scl_is_output_only:1; 37*8786b095SHeiner Kallweit unsigned int scl_has_no_pullup:1; 381e9d4219SWolfram Sang }; 391e9d4219SWolfram Sang 401e9d4219SWolfram Sang #endif /* _LINUX_I2C_GPIO_H */ 41