Some ECs need a little time for waking up before they can accept
SPI data at a high speed. Add a "google,cros-ec-spi-pre-delay"
property to the DT binding to configure this.

If this property isn't set, then no delay will be added. However,
if set it will cause a delay equal to the value passed to it to
be inserted at the beginning of a transaction.
Signed-off-by: NAlexandru M Stan <amstan@chromium.org>
Reviewed-by: NDoug Anderson <dianders@chromium.org>
Signed-off-by: NChris Zhong <zyw@rock-chips.com>
Signed-off-by: NJavier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: NHeiko Stuebner <heiko@sntech.de>
Acked-by: NLee Jones <lee.jones@linaro.org>
Acked-by: NOlof Johansson <olof@lixom.net>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

The EC has specific timing it requires. Add support for an optional delay
after raising CS to fix timing issues. This is configurable based on
a DT property "google,cros-ec-spi-msg-delay".

If this property isn't set, then no delay will be added. However, if set
it will cause a delay equal to the value passed to it to be inserted at
the end of a transaction.
Signed-off-by: NRhyland Klein <rklein@nvidia.com>
Reviewed-by: NBernie Thompson <bhthompson@chromium.org>
Reviewed-by: NAndrew Bresticker <abrestic@chromium.org>
Acked-by: NMark Rutland <mark.rutland@arm.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

Correct spelling typo in devicetree/bindings.
Singed-off-by: NMasanari Iida <standby24x7@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

This is the base EC implementation, which provides a high level
interface to the EC for use by the rest of the kernel. The actual
communcations is dealt with by a separate protocol driver which
registers itself with this interface.

Interrupts are passed on through a notifier.

A simple message structure is used to pass messages to the
protocol driver.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Signed-off-by: NChe-Liang Chiou <clchiou@chromium.org>
Signed-off-by: NJonathan Kliegman <kliegs@chromium.org>
Signed-off-by: NLuigi Semenzato <semenzato@chromium.org>
Signed-off-by: NOlof Johansson <olofj@chromium.org>
Signed-off-by: NVincent Palatin <vpalatin@chromium.org>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>