diff options
Diffstat (limited to 'include/linux/platform_data/i2c-gpio.h')
| -rw-r--r-- | include/linux/platform_data/i2c-gpio.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/include/linux/platform_data/i2c-gpio.h b/include/linux/platform_data/i2c-gpio.h new file mode 100644 index 000000000000..545639bcca72 --- /dev/null +++ b/include/linux/platform_data/i2c-gpio.h @@ -0,0 +1,40 @@ +/* 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 */ |