tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1* System Controller Registers R/W driver
2
3System controller node represents a register region containing a set
4of miscellaneous registers. The registers are not cohesive enough to
5represent as any specific type of device. The typical use-case is for
6some other node's driver, or platform-specific code, to acquire a
7reference to the syscon node (e.g. by phandle, node path, or search
8using a specific compatible value), interrogate the node (or associated
9OS driver) to determine the location of the registers, and access the
10registers directly.
11
12Required properties:
13- compatible: Should contain "syscon".
14- reg: the register region can be accessed from syscon
15
16Optional property:
17- reg-io-width: the size (in bytes) of the IO accesses that should be
18 performed on the device.
19- hwlocks: reference to a phandle of a hardware spinlock provider node.
20
21Examples:
22gpr: iomuxc-gpr@20e0000 {
23 compatible = "fsl,imx6q-iomuxc-gpr", "syscon";
24 reg = <0x020e0000 0x38>;
25 hwlocks = <&hwlock1 1>;
26};
27
28hwlock1: hwspinlock@40500000 {
29 ...
30 reg = <0x40500000 0x1000>;
31 #hwlock-cells = <1>;
32};