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Diffstat (limited to 'Documentation/devicetree/bindings/clock/nvidia,tegra124-car.yaml')
-rw-r--r-- | Documentation/devicetree/bindings/clock/nvidia,tegra124-car.yaml | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-car.yaml b/Documentation/devicetree/bindings/clock/nvidia,tegra124-car.yaml new file mode 100644 index 000000000..1b2181f6d --- /dev/null +++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-car.yaml @@ -0,0 +1,108 @@ +# SPDX-License-Identifier: (GPL-2.0+ OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/nvidia,tegra124-car.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: NVIDIA Tegra Clock and Reset Controller + +maintainers: + - Jon Hunter <jonathanh@nvidia.com> + - Thierry Reding <thierry.reding@gmail.com> + +description: | + The Clock and Reset (CAR) is the HW module responsible for muxing and gating + Tegra's clocks, and setting their rates. It comprises CLKGEN and RSTGEN units. + + CLKGEN provides the registers to program the PLLs. It controls most of + the clock source programming and most of the clock dividers. + + CLKGEN input signals include the external clock for the reference frequency + (12 MHz, 26 MHz) and the external clock for the Real Time Clock (32.768 KHz). + + Outputs from CLKGEN are inputs clock of the h/w blocks in the Tegra system. + + RSTGEN provides the registers needed to control resetting of each block in + the Tegra system. + +properties: + compatible: + const: nvidia,tegra124-car + + reg: + maxItems: 1 + + '#clock-cells': + const: 1 + + "#reset-cells": + const: 1 + + nvidia,external-memory-controller: + $ref: /schemas/types.yaml#/definitions/phandle + description: + phandle of the external memory controller node + +patternProperties: + "^emc-timings-[0-9]+$": + type: object + properties: + nvidia,ram-code: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + value of the RAM_CODE field in the PMC_STRAPPING_OPT_A register that + this timing set is used for + + patternProperties: + "^timing-[0-9]+$": + type: object + properties: + clock-frequency: + description: + external memory clock rate in Hz + minimum: 1000000 + maximum: 1000000000 + + nvidia,parent-clock-frequency: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + rate of parent clock in Hz + minimum: 1000000 + maximum: 1000000000 + + clocks: + items: + - description: parent clock of EMC + + clock-names: + items: + - const: emc-parent + + required: + - clock-frequency + - nvidia,parent-clock-frequency + - clocks + - clock-names + + additionalProperties: false + + additionalProperties: false + +required: + - compatible + - reg + - '#clock-cells' + - "#reset-cells" + +additionalProperties: false + +examples: + - | + #include <dt-bindings/clock/tegra124-car.h> + + car: clock-controller@60006000 { + compatible = "nvidia,tegra124-car"; + reg = <0x60006000 0x1000>; + #clock-cells = <1>; + #reset-cells = <1>; + }; |