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| author | Biwen Li <biwen.li@nxp.com> | 2019-12-25 18:36:23 +0800 |
|---|---|---|
| committer | Peter Rosin <peda@axentia.se> | 2020-01-03 15:00:53 +0100 |
| commit | e65e228eb0963be32180db3039f0a1467b426aae (patch) | |
| tree | 558ac11521f2584fbd7eebe13a24c29e2332548a /arch | |
| parent | 0d1569a763faef9df0f08c19c31c6aea84a302ff (diff) | |
| download | linux-stable-e65e228eb0963be32180db3039f0a1467b426aae.tar.gz linux-stable-e65e228eb0963be32180db3039f0a1467b426aae.tar.bz2 linux-stable-e65e228eb0963be32180db3039f0a1467b426aae.zip | |
i2c: mux: pca954x: support property idle-state
This supports property idle-state,if present,
overrides i2c-mux-idle-disconnect.
My use cases:
- Use the property idle-state to fix
an errata on LS2085ARDB and LS2088ARDB.
- Errata id: E-00013(board LS2085ARDB and
LS2088ARDB revision on Rev.B, Rev.C and Rev.D).
- About E-00013:
- Description: I2C1 and I2C3 buses
are missing pull-up.
- Impact: When the PCA954x device is tri-stated, the I2C bus
will float. This makes the I2C bus and its associated
downstream devices inaccessible.
- Hardware fix: Populate resistors R189 and R190 for I2C1
and resistors R228 and R229 for I2C3.
- Software fix: Remove the tri-state option from the PCA954x
driver(PCA954x always on enable status, specify a
channel zero in dts to fix the errata E-00013).
Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Biwen Li <biwen.li@nxp.com>
Signed-off-by: Peter Rosin <peda@axentia.se>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions