Am Dienstag, 2. Juni 2015, 10:11:03 schrieb Javier Martinez Canillas: > Hello, > > Newer Chromebooks have more than one Embedded Controller (EC) in the > system. These additional ECs are connected through I2C with a host EC > which is the one that is connected to the Application Processor (AP) > through different transports (I2C, SPI or LPC). > > So on these platforms, sub-processors are chained to each other: > > AP <--> Host EC <--> Power Delivery (PD) EC > > The AP sends commands to the additional EC through the host EC using > a set of passthru commands and the host redirects to the correct EC. > > This is a v4 of a series that adds support for multiple EC in a system > and also for the protocol version 3 that is used on newer ECs. > > Most patches were taken from the downstream ChromiumOS v3.14 tree with > fixes squashed, split to minimise the cross subsystem churn and changes > for mainline inclusion but were not modified functionality wise. > > This version addresses a lot of issues pointed out by Lee Jones on the v3 > posted before [0]. > > The patches are based on top of "[PATCH 0/2] mfd: cros_ec: Small cleanups" > [1] that were posted before and was already picked by Lee Jones. > > Testing was done on some Chromebooks that have a single EC and support > protocol v2 such as the Exynos5250 Snow, Exynos5420 Peach Pit and Exynos5800 > Peach Pi to be sure that no regressions were introduced for these machines. I just gave this a try on veyron and everything still works as expected. All patches except "[PATCH v4 6/8] mfd: cros_ec: Support multiple EC in a system" already have Tested-by tags, so this patch now is also Tested-by: Heiko Stuebner <heiko@xxxxxxxxx> Heiko -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
