Hello,
This series adds support for a new pca9541 device-tree property
("release-delay-us"), which delays releasing ownership of the bus
after a transaction for a configurable duration, anticipating that
another transaction may follow shortly. By avoiding a
release/reacquisition between transactions, this can provide a
substantial performance improvement for back-to-back operations -- on
a Delta AHE-50DC (ASPEED AST1250) system running OpenBMC with dozens
of LM25066 PMICs on PCA9541-arbitrated busses, a setting of 10000 (10
ms) reduces the median latency the psusensor daemon's hwmon sysfs file
reads from 2.28 ms to 0.99 ms (a 57% improvement).
Thanks,
Zev
Changes since v1 [0]:
- removed spurious #include line from dt-bindings example
[0] https://lore.kernel.org/linux-i2c/20220124213850.3766-1-zev@xxxxxxxxxxxxxxxxx/
Zev Weiss (2):
i2c: mux: pca9541: add delayed-release support
dt-bindings: i2c: add nxp,pca9541 release-delay-us property
.../devicetree/bindings/i2c/nxp,pca9541.txt | 9 +++
drivers/i2c/muxes/i2c-mux-pca9541.c | 56 ++++++++++++++++---
2 files changed, 56 insertions(+), 9 deletions(-)
--
2.34.1
