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authorGeorgi Djakov <georgi.djakov@linaro.org>2017-12-05 18:47:00 +0300
committerJassi Brar <jaswinder.singh@linaro.org>2018-02-04 09:46:34 +0300
commit0ae7d327a64b262443b7d3ebee5831e4dde47b89 (patch)
treea13d0664a450e16e90bcbd45dc470b3944d968df /Documentation
parentc815d769b598196bdbd104a7e049d07ae6fba0d2 (diff)
downloadlinux-0ae7d327a64b262443b7d3ebee5831e4dde47b89.tar.xz
dt-bindings: mailbox: qcom: Document the APCS clock binding
Update the binding documentation for APCS to mention that the APCS hardware block also expose a clock controller functionality. The APCS clock controller is a mux and half-integer divider. It has the main CPU PLL as an input and provides the clock for the application CPU. Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt18
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt b/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt
index fb961c310f44..16964f0c1773 100644
--- a/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt
+++ b/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt
@@ -15,12 +15,21 @@ platforms.
Usage: required
Value type: <prop-encoded-array>
Definition: must specify the base address and size of the global block
+- clocks:
+ Usage: required if #clocks-cells property is present
+ Value type: <phandle>
+ Definition: phandle to the input PLL, which feeds the APCS mux/divider
- #mbox-cells:
Usage: required
Value type: <u32>
Definition: as described in mailbox.txt, must be 1
+- #clock-cells:
+ Usage: optional
+ Value type: <u32>
+ Definition: as described in clock.txt, must be 0
+
= EXAMPLE
The following example describes the APCS HMSS found in MSM8996 and part of the
@@ -44,3 +53,12 @@ GLINK RPM referencing the "rpm_hlos" doorbell therein.
mbox-names = "rpm_hlos";
};
+Below is another example of the APCS binding on MSM8916 platforms:
+
+ apcs: mailbox@b011000 {
+ compatible = "qcom,msm8916-apcs-kpss-global";
+ reg = <0xb011000 0x1000>;
+ #mbox-cells = <1>;
+ clocks = <&a53pll>;
+ #clock-cells = <0>;
+ };