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Subject[RFC PATCH 1/4] dts: misc: Add bindings documentation for bmc-misc-ctrl
Date
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
---
.../bindings/misc/bmc-misc-ctrl.txt | 252 ++++++++++++++++++
MAINTAINERS | 6 +
2 files changed, 258 insertions(+)
create mode 100644 Documentation/devicetree/bindings/misc/bmc-misc-ctrl.txt

diff --git a/Documentation/devicetree/bindings/misc/bmc-misc-ctrl.txt b/Documentation/devicetree/bindings/misc/bmc-misc-ctrl.txt
new file mode 100644
index 000000000000..4661926030e4
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/bmc-misc-ctrl.txt
@@ -0,0 +1,252 @@
+BMC Miscellaneous Control Interfaces
+====================================
+
+Baseboard Management Controllers (BMCs) often have an array of hardware
+features that need to be described but are awkward to sensibly expose.
+
+This bindings document provides a generic mechanism for describing such
+features, covering read-only (RO), read-modify-write (RMW) and
+write-1-set/write-1-clear (W1SC) semantics.
+
+All uses of bmc-misc-ctrl must be documented under Valid Uses below.
+
+The bindings are similar in nature to register-bit-led.
+
+Required Properties
+-------------------
+
+compatible: Must be "bmc-misc-ctrl"
+offset: A one or three cell property describing the registers
+ associated with the field.
+
+ If the optional property 'set-clear' is not present then the
+ node describes a register with read-modify-write semantics. The
+ offset property has one cell describing the register of
+ interest.
+
+ If the optional property 'set-clear' is present then the node
+ describes a register set that together implement read,
+ write-1-set and write-1-clear semantics. The offset property
+ must be three cells, the first is the address of the register
+ to read from, the second the write-1-set register and the third
+ write-1-clear.
+
+mask: A mask whose set bits represent the bits of the field.
+label: The name of the field
+
+Optional Properties
+-------------------
+
+read-only: Define a read-only field (RMW/W1SC irrelevant).
+set-clear: Define whether the field exists in a RMW or W1SC register set
+default-value: Single cell applicable to RMW. The field will be updated to the
+ cell's value.
+default-set: For W1SC, set all bits in the field
+default-clear: For W1SC, clear all bits in the field
+
+Valid Uses
+----------
+
+Description: Control bit for switching the video display DAC mux between
+ host VGA and BMC CRT mode
+Machines: aspeed,ast2500
+Parent: compatible = "aspeed,ast2500-scu", "syscon", "simple-mfd";
+Node:
+ field@2c.16 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0x2c>;
+ mask = <0x00030000>;
+ label = "dac-mux";
+ };
+
+Description: Host VGA scratch registers
+Machines: aspeed,ast2500
+Parent: compatible = "aspeed,ast2500-scu", "syscon", "simple-mfd";
+Node:
+ field@50.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0x50>;
+ mask = <0xffffffff>;
+ label = "vga0";
+ read-only;
+ };
+
+ field@54.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0x54>;
+ mask = <0xffffffff>;
+ label = "vga1";
+ read-only;
+ };
+
+ field@58.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0x58>;
+ mask = <0xffffffff>;
+ label = "vga2";
+ read-only;
+ };
+
+ field@5c.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0x5c>;
+ mask = <0xffffffff>;
+ label = "vga3";
+ read-only;
+ };
+
+ field@60.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0x60>;
+ mask = <0xffffffff>;
+ label = "vga4";
+ read-only;
+ };
+
+ field@64.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0x64>;
+ mask = <0xffffffff>;
+ label = "vga5";
+ read-only;
+ };
+
+ field@68.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0x68>;
+ mask = <0xffffffff>;
+ label = "vga6";
+ read-only;
+ };
+
+ field@6c.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0x6c>;
+ mask = <0xffffffff>;
+ label = "vga7";
+ read-only;
+ };
+
+Description: Super I/O device scratch registers for host/BMC communication
+Machines: aspeed,ast2500
+Parent: compatible = "aspeed,ast2500-lpc-host", "simple-mfd", "syscon";
+ field@f0.24 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf0 24 8>;
+ mask = <0xff000000>;
+ label = "sio-2b";
+ };
+
+ field@f0.16 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf0>;
+ mask = <0x00ff0000>;
+ label = "sio-2a";
+ };
+
+ field@f0.8 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf0>;
+ mask = <0x0000ff00>;
+ bit-shift = <8>;
+ label = "sio-29";
+ };
+
+ field@f0.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf0>;
+ mask = <0x000000ff>;
+ label = "sio-28";
+ };
+
+ field@f4.24 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf4>;
+ mask = <0xff000000>;
+ label = "sio-2f";
+ };
+
+ field@f4.16 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf4>;
+ mask = <0x00ff0000>;
+ label = "sio-2e";
+ };
+
+ field@f4.8 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf4>;
+ mask = <0x0000ff00>;
+ label = "sio-2d";
+ };
+
+ field@f4.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf4>;
+ mask = <0x000000ff>;
+ label = "sio-2c";
+ };
+
+ field@f8.24 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf8>;
+ mask = <0xff000000>;
+ read-only;
+ label = "sio-23";
+ };
+
+ field@f8.16 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf8>;
+ mask = <0x00ff0000>;
+ read-only;
+ label = "sio-22";
+ };
+
+ field@f8.8 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf8>;
+ mask = <0x0000ff00>;
+ read-only;
+ label = "sio-21";
+ };
+
+ field@f8.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xf8>;
+ mask = <0x000000ff>;
+ read-only;
+ label = "sio-20";
+ };
+
+ field@fc.24 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xfc>;
+ mask = <0xff000000>;
+ read-only;
+ label = "sio-27";
+ };
+
+ field@fc.16 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xfc>;
+ mask = <0x00ff0000>;
+ read-only;
+ label = "sio-26";
+ };
+
+ field@fc.8 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xfc>;
+ mask = <0x0000ff00>;
+ read-only;
+ label = "sio-25";
+ };
+
+ field@fc.0 {
+ compatible = "bmc-misc-ctrl";
+ offset = <0xfc>;
+ mask = <0x000000ff>;
+ read-only;
+ label = "sio-24";
+ };
diff --git a/MAINTAINERS b/MAINTAINERS
index 07d1576fc766..9766d7832d8b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2736,6 +2736,12 @@ S: Supported
F: drivers/net/bonding/
F: include/uapi/linux/if_bonding.h

+BMC MISCELLANEOUS CONTROL
+R: Andrew Jeffery <andrew@aj.id.au>
+L: openbmc@lists.ozlabs.org (moderated for non-subscribers)
+S: Supported
+F: Documentation/devicetree/bindings/misc/bmc-misc-ctrl.txt
+
BPF (Safe dynamic programs and tools)
M: Alexei Starovoitov <ast@kernel.org>
M: Daniel Borkmann <daniel@iogearbox.net>
--
2.17.1
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