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 Power domain bindings based on SCU Message Protocol
66 ------------------------------------------------------------
68 This binding for the SCU power domain providers uses the generic power
72 - compatible: Should be one of:
75 followed by "fsl,scu-pd"
77 - #power-domain-cells: Must be 1. Contains the Resource ID used by
79 See detailed Resource ID list from:
80 include/dt-bindings/firmware/imx/rsrc.h
82 Clock bindings based on SCU Message Protocol
83 ------------------------------------------------------------
85 This binding uses the common clock binding[1].
88 - compatible: Should be one of:
91 followed by "fsl,scu-clk"
92 - #clock-cells: Should be either
93 2: Contains the Resource and Clock ID value.
95 1: Contains the Clock ID value. (DEPRECATED)
96 - clocks: List of clock specifiers, must contain an entry for
97 each required entry in clock-names
98 - clock-names: Should include entries "xtal_32KHz", "xtal_24MHz"
100 The clock consumer should specify the desired clock by having the clock
101 ID in its "clocks" phandle cell.
103 See the full list of clock IDs from:
104 include/dt-bindings/clock/imx8qxp-clock.h
106 Pinctrl bindings based on SCU Message Protocol
107 ------------------------------------------------------------
109 This binding uses the i.MX common pinctrl binding[3].
112 - compatible: Should be one of:
114 "fsl,imx8qxp-iomuxc",
115 "fsl,imx8dxl-iomuxc".
117 Required properties for Pinctrl sub nodes:
118 - fsl,pins: Each entry consists of 3 integers which represents
119 the mux and config setting for one pin. The first 2
120 integers <pin_id mux_mode> are specified using a
121 PIN_FUNC_ID macro, which can be found in
122 <dt-bindings/pinctrl/pads-imx8qm.h>,
123 <dt-bindings/pinctrl/pads-imx8qxp.h>,
124 <dt-bindings/pinctrl/pads-imx8dxl.h>.
125 The last integer CONFIG is the pad setting value like
128 Please refer to i.MX8QXP Reference Manual for detailed
131 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
132 [2] Documentation/devicetree/bindings/power/power-domain.yaml
133 [3] Documentation/devicetree/bindings/pinctrl/fsl,imx-pinctrl.txt
135 RTC bindings based on SCU Message Protocol
136 ------------------------------------------------------------
139 - compatible: should be "fsl,imx8qxp-sc-rtc";
141 OCOTP bindings based on SCU Message Protocol
142 ------------------------------------------------------------
144 - compatible: Should be one of:
145 "fsl,imx8qm-scu-ocotp",
146 "fsl,imx8qxp-scu-ocotp".
147 - #address-cells: Must be 1. Contains byte index
148 - #size-cells: Must be 1. Contains byte length
150 Optional Child nodes:
152 - Data cells of ocotp:
153 Detailed bindings are described in bindings/nvmem/nvmem.txt
155 Watchdog bindings based on SCU Message Protocol
156 ------------------------------------------------------------
159 - compatible: should be:
161 followed by "fsl,imx-sc-wdt";
163 - timeout-sec: contains the watchdog timeout in seconds.
165 SCU key bindings based on SCU Message Protocol
166 ------------------------------------------------------------
169 - compatible: should be:
171 followed by "fsl,imx-sc-key";
172 - linux,keycodes: See Documentation/devicetree/bindings/input/input.yaml
174 Thermal bindings based on SCU Message Protocol
175 ------------------------------------------------------------
178 - compatible: Should be :
179 "fsl,imx8qxp-sc-thermal"
180 followed by "fsl,imx-sc-thermal";
182 - #thermal-sensor-cells: See Documentation/devicetree/bindings/thermal/thermal-sensor.yaml
191 lsio_mu1: mailbox@5d1c0000 {
198 compatible = "fsl,imx-scu";
199 mbox-names = "tx0", "tx1", "tx2", "tx3",
200 "rx0", "rx1", "rx2", "rx3",
202 mboxes = <&lsio_mu1 0 0
213 compatible = "fsl,imx8qxp-clk", "fsl,scu-clk";
218 compatible = "fsl,imx8qxp-iomuxc";
220 pinctrl_lpuart0: lpuart0grp {
222 SC_P_UART0_RX_ADMA_UART0_RX 0x06000020
223 SC_P_UART0_TX_ADMA_UART0_TX 0x06000020
229 ocotp: imx8qx-ocotp {
230 compatible = "fsl,imx8qxp-scu-ocotp";
231 #address-cells = <1>;
240 compatible = "fsl,imx8qxp-scu-pd", "fsl,scu-pd";
241 #power-domain-cells = <1>;
245 compatible = "fsl,imx8qxp-sc-rtc";
249 compatible = "fsl,imx8qxp-sc-key", "fsl,imx-sc-key";
250 linux,keycodes = <KEY_POWER>;
254 compatible = "fsl,imx8qxp-sc-wdt", "fsl,imx-sc-wdt";
258 tsens: thermal-sensor {
259 compatible = "fsl,imx8qxp-sc-thermal", "fsl,imx-sc-thermal";
260 #thermal-sensor-cells = <1>;
267 pinctrl-names = "default";
268 pinctrl-0 = <&pinctrl_lpuart0>;
269 clocks = <&uart0_clk IMX_SC_R_UART_0 IMX_SC_PM_CLK_PER>;
271 power-domains = <&pd IMX_SC_R_UART_0>;