The System Controller Firmware (SCFW) is a low-level system function
which runs on a dedicated Cortex-M core to provide power, clock, and
resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
(QM, QP), and i.MX8QX (QXP, DX).
Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
Cc: Sascha Hauer <kernel@xxxxxxxxxxxxxx>
Cc: Fabio Estevam <fabio.estevam@xxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx>
---
.../devicetree/bindings/arm/freescale/fsl,scu.txt | 40 ++++++++++++++++++++++
1 file changed, 40 insertions(+)
create mode 100644 Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
new file mode 100644
index 0000000..3b51d82
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
@@ -0,0 +1,40 @@
+NXP i.MX System Controller Firmware (SCFW)
+--------------------------------------------------------------------
+
+The System Controller Firmware (SCFW) is a low-level system function
+which runs on a dedicated Cortex-M core to provide power, clock, and
+resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
+(QM, QP), and i.MX8QX (QXP, DX).
+
+The AP communicates with the SC using a multi-ported MU module found
+in the LSIO subsystem. The current definition of this MU module provides
+5 remote AP connections to the SC to support up to 5 execution environments
+(TZ, HV, standard Linux, etc.). The SC side of this MU module interfaces
+with the LSIO DSC IP bus. The SC firmware will communicate with this MU
+using the MSI bus.
+
+System Controller Device Node:
+=============================
+
+Required properties:
+-------------------
+- compatible: should be "fsl,imx8qxp-scu" or "fsl,imx8qm-scu"
+- fsl,mu: a phandle to the Message Unit used by SCU. Should be
+ one of LSIO MU0~M4 for imx8qxp and imx8qm. Users need
+ to make sure not use the one which is conflict with
+ other execution environments. e.g. ATF.
+
+Examples:
+--------
+lsio_mu0: mu@5d1b0000 {
+ compatible = "fsl,imx8qxp-mu", "fsl,imx6sx-mu";
+ reg = <0x0 0x5d1b0000 0x0 0x10000>;
+ interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
+ status = "okay";
+};
+
+scu {
+ compatible = "fsl,imx8qxp-scu";
+ fsl,mu = <&lsio_mu0>;
+ status = "okay";
+};
--
2.7.4
--
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