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i2c-bcm2708: fixed baudrate Fixed issue where the wrong CDIV value was set for baudrates below 3815 Hz (for 250MHz bus clock). In that case the computed CDIV value was more than 0xffff. However the CDIV register width is only 16 bits. This resulted in incorrect setting of CDIV and higher baudrate than intended. Example: 3500Hz -> CDIV=0x11704 -> CDIV(16bit)=0x1704 -> 42430Hz After correction: 3500Hz -> CDIV=0x11704 -> CDIV(16bit)=0xffff -> 3815Hz The correct baudrate is shown in the log after the cdiv > 0xffff correction. Perform I2C combined transactions when possible Perform I2C combined transactions whenever possible, within the restrictions of the Broadcomm Serial Controller. Disable DONE interrupt during TA poll Prevent interrupt from being triggered if poll is missed and transfer starts and finishes. i2c: Make combined transactions optional and disabled by default i2c: bcm2708: add device tree support Add DT support to driver and add to .dtsi file. Setup pins in .dts file. i2c is disabled by default. Signed-off-by: Noralf Tronnes <notro@tronnes.org> bcm2708: don't register i2c controllers when using DT The devices for the i2c controllers are in the Device Tree. Only register devices when not using DT. Signed-off-by: Noralf Tronnes <notro@tronnes.org> I2C: Only register the I2C device for the current board revision i2c_bcm2708: Fix clock reference counting Fix grabbing lock from atomic context in i2c driver 2 main changes: - check for timeouts in the bcm2708_bsc_setup function as indicated by this comment: /* poll for transfer start bit (should only take 1-20 polls) */ This implies that the setup function can now fail so account for this everywhere it's called - Removed the clk_get_rate call from inside the setup function as it locks a mutex and that's not ok since we call it from under a spin lock. i2c-bcm2708: When using DT, leave the GPIO setup to pinctrl i2c-bcm2708: Increase timeouts to allow larger transfers Use the timeout value provided by the I2C_TIMEOUT ioctl when waiting for completion. The default timeout is 1 second. See: https://github.com/raspberrypi/linux/issues/260 i2c-bcm2708/BCM270X_DT: Add support for I2C2 The third I2C bus (I2C2) is normally reserved for HDMI use. Careless use of this bus can break an attached display - use with caution. It is recommended to disable accesses by VideoCore by setting hdmi_ignore_edid=1 or hdmi_edid_file=1 in config.txt. The interface is disabled by default - enable using the i2c2_iknowwhatimdoing DT parameter. bcm2708-spi: Don't use static pin configuration with DT Also remove superfluous error checking - the SPI framework ensures the validity of the chip_select value. i2c-bcm2708: Remove non-DT support Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Set the BSC_CLKT clock streching timeout to 35ms as per SMBus specs. Fixes i2c_bcm2708: Write to FIFO correctly - v2 (#1574) * i2c: fix i2c_bcm2708: Clear FIFO before sending data Make sure FIFO gets cleared before trying to send data in case of a repeated start (COMBINED=Y). * i2c: fix i2c_bcm2708: Only write to FIFO when not full Check if FIFO can accept data before writing. To avoid a peripheral read on the last iteration of a loop, both bcm2708_bsc_fifo_fill and ~drain are changed as well.
Linux kernel
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Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.
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