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RFC Add cdns-i2c driver as drop in for zynq-i2c

Michal Simek u-boot 1 version New

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  1. v1 RFC Latest0 of 2 patches 0 repliesNew

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Cover letter [U-Boot] [RFC 0/2] Add cdns-i2c driver as drop in for zynq-i2c
Quoted 20 lines · Moritz Fischer

Hi all,

I spent some time moving over the zynq-i2c.c to support dm. While doing that I realized that renaming it to cdns-i2c might make sense since it now could be used with other SoCs that also use the the Cadence IP.

This is a first shot, but I'd like to get some early feedback ;-)

Cheers,

Moritz

PS: I skipped touching the Zynq board files for now, since I wanted to make sure I get the driver right first ;-)

Moritz Fischer (2):
i2c: Describe Cadence I2C devicetree bindings
dm: i2c: Add driver for Cadence I2C IP

Quoted 8 lines
 doc/device-tree-bindings/i2c/i2c-cdns.txt |  20 ++
 drivers/i2c/Kconfig                       |   7 +
 drivers/i2c/Makefile                      |   1 +
 drivers/i2c/i2c-cdns.c                    | 339 ++++++++++++++++++++++++++++++
 4 files changed, 367 insertions(+)
 create mode 100644 doc/device-tree-bindings/i2c/i2c-cdns.txt
 create mode 100644 drivers/i2c/i2c-cdns.c

I have looked at these patches and I don't know why there is 100k limitation in cdns_i2c_set_bus_speed. DTS is using 400k in Linux without any problem.

Unfortunately I found that i2c muxes like pca9548 are not supported yet but I have create sort of skeleton for that but it looks like that there is no standard binding where i2c-parent is required. Also every muxes bus needs to have correct label and alias.

Also I have found that there is eeprom dependency which needs to be resolved to be able to use this driver instead of old one.

Thanks,
Michal

Read the cover letter in its thread