| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * i2c-gpio interface to platform code |
| * |
| * Copyright (C) 2007 Atmel Corporation |
| */ |
| #ifndef _LINUX_I2C_GPIO_H |
| #define _LINUX_I2C_GPIO_H |
| |
| /** |
| * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio |
| * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz |
| * @timeout: clock stretching timeout in jiffies. If the slave keeps |
| * SCL low for longer than this, the transfer will time out. |
| * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin |
| * isn't actively driven high when setting the output value high. |
| * gpio_get_value() must return the actual pin state even if the |
| * pin is configured as an output. |
| * @sda_is_output_only: SDA output drivers can't be turned off. |
| * This is for clients that can only read SDA/SCL. |
| * @sda_has_no_pullup: SDA is used in a non-compliant way and has no pull-up. |
| * Therefore disable open-drain. |
| * @scl_is_open_drain: SCL is set up as open drain. Same requirements |
| * as for sda_is_open_drain apply. |
| * @scl_is_output_only: SCL output drivers cannot be turned off. |
| * @scl_has_no_pullup: SCL is used in a non-compliant way and has no pull-up. |
| * Therefore disable open-drain. |
| */ |
| struct i2c_gpio_platform_data { |
| int udelay; |
| int timeout; |
| unsigned int sda_is_open_drain:1; |
| unsigned int sda_is_output_only:1; |
| unsigned int sda_has_no_pullup:1; |
| unsigned int scl_is_open_drain:1; |
| unsigned int scl_is_output_only:1; |
| unsigned int scl_has_no_pullup:1; |
| }; |
| |
| #endif /* _LINUX_I2C_GPIO_H */ |
