diff options
| author | Simon Glass | 2017-05-12 21:10:00 -0600 |
|---|---|---|
| committer | Heiko Schocher | 2017-05-15 06:19:10 +0200 |
| commit | ce3b5d69112b1adc878e06586c1bc819414309be (patch) | |
| tree | 30b5537e6c4669f966184cf5c05723976a8bd602 /README | |
| parent | 213f27f3f9c89dbf32e38cb031b303193e6e8627 (diff) | |
Drop use of CONFIG_I2C_SOFT
This option is not used in U-Boot. Drop it.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 32 |
1 files changed, 1 insertions, 31 deletions
@@ -2204,37 +2204,7 @@ The following options need to be configured: If you do not have i2c muxes on your board, omit this define. -----under removal: - -- Legacy I2C Support: CONFIG_SOFT_I2C - - NOTE: It is intended to move drivers to CONFIG_SYS_I2C which - provides the following compelling advantages: - - - more than one i2c adapter is usable - - approved multibus support - - better i2c mux support - - ** CONFIG_SOFT_I2C is now being removed ** - - With CONFIG_SOFT_I2C you will need to define - CONFIG_SYS_I2C_SPEED to be the frequency (in Hz) at which you - wish your i2c bus to run and CONFIG_SYS_I2C_SLAVE to be the - address of this node (ie the CPU's i2c node address). - - Now, the u-boot i2c code for the mpc8xx - (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node - and so its address should therefore be cleared to 0 (See, - eg, MPC823e User's Manual p.16-473). So, set - CONFIG_SYS_I2C_SLAVE to 0. - - When a board is reset during an i2c bus transfer - chips might think that the current transfer is still - in progress. Reset the slave devices by sending start - commands until the slave device responds. - - That's all that's required for CONFIG_HARD_I2C. - +- Legacy I2C Support: If you use the software i2c interface (CONFIG_SYS_I2C_SOFT) then the following macros need to be defined (examples are from include/configs/lwmon.h): |