From: Mirza Krak <mirza.krak@xxxxxxxxx>
Document the devicetree bindings for NOR bus driver found on Tegra20 and
Tegra30 SOCs
Signed-off-by: Mirza Krak <mirza.krak@xxxxxxxxx>
---
.../devicetree/bindings/bus/nvidia,tegra20-nor.txt | 73 ++++++++++++++++++++++
1 file changed, 73 insertions(+)
create mode 100644 Documentation/devicetree/bindings/bus/nvidia,tegra20-nor.txt
diff --git a/Documentation/devicetree/bindings/bus/nvidia,tegra20-nor.txt b/Documentation/devicetree/bindings/bus/nvidia,tegra20-nor.txt
new file mode 100644
index 0000000..9ee4a66
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+++ b/Documentation/devicetree/bindings/bus/nvidia,tegra20-nor.txt
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+Device tree bindings for NVIDIA Tegra20/30 NOR Bus
+
+The NOR controller supports a number of memory types, including synchronous NOR,
+asynchronous NOR, and other flash memories with similar interfaces, such as
+MuxOneNAND. One could also connect high speed devices like FPGAs, DSPs,
+CAN chips, Wi-Fi chips etc.
+
+The actual devices are instantiated from the child nodes of a NOR node.
+
+Required properties:
+
+ - compatible: should be "nvidia,tegra20-nor", "nvidia,tegra30-nor"
+ - reg: Should contain NOR controller registers location and length.
+ - clocks: Must contain one entry, for the module clock.
+ See ../clocks/clock-bindings.txt for details.
+ - resets : Must contain an entry for each entry in reset-names.
+ See ../reset/reset.txt for details.
+ - reset-names : Must include the following entries:
+ - nor
+ - #address-cells: Must be set to 2 to allow memory address translation
+ - #size-cells: Must be set to 1 to allow CS address passing
+ - ranges: Must be set up to reflect the memory layout with four integer
+ values for each chip-select line in use.
+ - nvidia,config: This property represents the SNOR_CONFIG_0 register.
+
+Note that the NOR controller does not have any internal chip-select address
+decoding and if you want to access multiple devices external chip-select
+decoding must be provided.
+
+Optional properties:
+
+ - nvidia,cs-timing: The timing array represents the SNOR_TIMING0_0 and
+ SNOR_TIMING1_0 registers for the NOR controller. If unset reset-values will
+ be used. See reference documentation for detailed description of the timing
+ registers.
+
+Example with two SJA1000 CAN controllers connected to the NOR bus:
+
+ nor@70009000 {
+ status = "okay";
+ compatible = "nvidia,tegra20-nor", "nvidia,tegra30-nor";
+ reg = <0x70009000 0x1000>;
+ #address-cells = <2>;
+ #size-cells = <1>;
+ clocks = <&tegra_car TEGRA30_CLK_NOR>;
+ resets = < &tegra_car 42>;
+ reset-names = "nor";
+ ranges = <
+ 0 0 0x48000000 0x00000100
+ 1 0 0x48040000 0x00000100
+ >;
+
+ can@0,0 {
+ compatible = "nxp,sja1000";
+ reg = <0 0 0x100>;
+ interrupt-parent = <&gpio>;
+ interrupts = <TEGRA_GPIO(B, 5) IRQ_TYPE_EDGE_RISING>;
+ nxp,external-clock-frequency = <24000000>;
+ nxp,tx-output-config = <0x16>;
+ nxp,clock-out-frequency = <24000000>;
+ reg-io-width = <2>;
+ };
+
+
+ can@1,0 {
+ compatible = "nxp,sja1000";
+ reg = <1 0 0x100>;
+ interrupt-parent = <&gpio>;
+ interrupts = <TEGRA_GPIO(A, 6) IRQ_TYPE_EDGE_RISING>;
+ nxp,external-clock-frequency = <24000000>;
+ nxp,tx-output-config = <0x16>;
+ reg-io-width = <2>;
+ };
--
2.1.4
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