1 NXP i.MX System Controller Firmware (SCFW)
2 --------------------------------------------------------------------
4 The System Controller Firmware (SCFW) is a low-level system function
5 which runs on a dedicated Cortex-M core to provide power, clock, and
6 resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
7 (QM, QP), and i.MX8QX (QXP, DX).
9 The AP communicates with the SC using a multi-ported MU module found
10 in the LSIO subsystem. The current definition of this MU module provides
11 5 remote AP connections to the SC to support up to 5 execution environments
12 (TZ, HV, standard Linux, etc.). The SC side of this MU module interfaces
13 with the LSIO DSC IP bus. The SC firmware will communicate with this MU
16 System Controller Device Node:
17 ============================================================
19 The scu node with the following properties shall be under the /firmware/ node.
23 - compatible: should be "fsl,imx-scu".
24 - mbox-names: should include "tx0", "tx1", "tx2", "tx3",
25 "rx0", "rx1", "rx2", "rx3";
26 include "gip3" if want to support general MU interrupt.
27 - mboxes: List of phandle of 4 MU channels for tx, 4 MU channels for
28 rx, and 1 optional MU channel for general interrupt.
29 All MU channels must be in the same MU instance.
30 Cross instances are not allowed. The MU instance can only
31 be one of LSIO MU0~M4 for imx8qxp and imx8qm. Users need
32 to make sure use the one which is not conflict with other
33 execution environments. e.g. ATF.
35 Channel 0 must be "tx0" or "rx0".
36 Channel 1 must be "tx1" or "rx1".
37 Channel 2 must be "tx2" or "rx2".
38 Channel 3 must be "tx3" or "rx3".
39 General interrupt rx channel must be "gip3".
41 mboxes = <&lsio_mu1 0 0
50 See Documentation/devicetree/bindings/mailbox/fsl,mu.yaml
51 for detailed mailbox binding.
53 Note: Each mu which supports general interrupt should have an alias correctly
54 numbered in "aliases" node.
60 i.MX SCU Client Device Node:
61 ============================================================
63 Client nodes are maintained as children of the relevant IMX-SCU device node.
65 RTC bindings based on SCU Message Protocol
66 ------------------------------------------------------------
69 - compatible: should be "fsl,imx8qxp-sc-rtc";
71 Watchdog bindings based on SCU Message Protocol
72 ------------------------------------------------------------
75 - compatible: should be:
77 followed by "fsl,imx-sc-wdt";
79 - timeout-sec: contains the watchdog timeout in seconds.
81 Thermal bindings based on SCU Message Protocol
82 ------------------------------------------------------------
85 - compatible: Should be :
86 "fsl,imx8qxp-sc-thermal"
87 followed by "fsl,imx-sc-thermal";
89 - #thermal-sensor-cells: See Documentation/devicetree/bindings/thermal/thermal-sensor.yaml
98 lsio_mu1: mailbox@5d1c0000 {
105 compatible = "fsl,imx-scu";
106 mbox-names = "tx0", "tx1", "tx2", "tx3",
107 "rx0", "rx1", "rx2", "rx3",
109 mboxes = <&lsio_mu1 0 0
120 compatible = "fsl,imx8qxp-sc-rtc";
124 compatible = "fsl,imx8qxp-sc-wdt", "fsl,imx-sc-wdt";
128 tsens: thermal-sensor {
129 compatible = "fsl,imx8qxp-sc-thermal", "fsl,imx-sc-thermal";
130 #thermal-sensor-cells = <1>;