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dt-bindings: Add binding for cros-ec-rpmsg 

Add a DT binding documentation for ChromeOS EC driver over rpmsg.

Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Pi-Hsun Shih 2019-06-03 11:45:10 +08:00 committed by Lee Jones
parent 297939901f
commit c77cd342f9
1 changed files with 4 additions and 1 deletions
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5
Documentation/devicetree/bindings/mfd/cros-ec.txt
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@ -3,7 +3,7 @@ ChromeOS Embedded Controller
Google's ChromeOS EC is a Cortex-M device which talks to the AP and Google's ChromeOS EC is a Cortex-M device which talks to the AP and
implements various function such as keyboard and battery charging. implements various function such as keyboard and battery charging.
The EC can be connect through various means (I2C, SPI, LPC) and the The EC can be connect through various means (I2C, SPI, LPC, RPMSG) and the
compatible string used depends on the interface. Each connection method has compatible string used depends on the interface. Each connection method has
its own driver which connects to the top level interface-agnostic EC driver. its own driver which connects to the top level interface-agnostic EC driver.
Other Linux driver (such as cros-ec-keyb for the matrix keyboard) connect to Other Linux driver (such as cros-ec-keyb for the matrix keyboard) connect to
@ -17,6 +17,9 @@ Required properties (SPI):
- compatible: "google,cros-ec-spi" - compatible: "google,cros-ec-spi"
- reg: SPI chip select - reg: SPI chip select
Required properties (RPMSG):
- compatible: "google,cros-ec-rpmsg"
Optional properties (SPI): Optional properties (SPI):
- google,cros-ec-spi-pre-delay: Some implementations of the EC need a little - google,cros-ec-spi-pre-delay: Some implementations of the EC need a little
time to wake up from sleep before they can receive SPI transfers at a high time to wake up from sleep before they can receive SPI transfers at a high