mtd: st_spi_fsm: Add device-tree binding documentation

Cc: devicetree@vger.kernel.org
Acked-by Angus Clark <angus.clark@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/Documentation/devicetree/bindings/mtd/st-fsm.txt b/Documentation/devicetree/bindings/mtd/st-fsm.txt
new file mode 100644 (file)
index 0000000..c248939
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/st-fsm.txt
@@ -0,0 +1,26 @@
+* ST-Microelectronics SPI FSM Serial (NOR) Flash Controller
+
+Required properties:
+  - compatible : Should be "st,spi-fsm"
+  - reg        : Contains register's location and length.
+  - reg-names  : Should contain the reg names "spi-fsm"
+  - interrupts : The interrupt number
+  - pinctrl-0  : Standard Pinctrl phandle (see: pinctrl/pinctrl-bindings.txt)
+
+Optional properties:
+  - st,syscfg          : Phandle to boot-device system configuration registers
+  - st,boot-device-reg : Address of the aforementioned boot-device register(s)
+  - st,boot-device-spi : Expected boot-device value if booted via this device
+
+Example:
+       spifsm: spifsm@fe902000{
+               compatible         = "st,spi-fsm";
+               reg                =  <0xfe902000 0x1000>;
+               reg-names          = "spi-fsm";
+               pinctrl-0          = <&pinctrl_fsm>;
+               st,syscfg          = <&syscfg_rear>;
+               st,boot-device-reg = <0x958>;
+               st,boot-device-spi = <0x1a>;
+               status = "okay";
+       };
+