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NXP NETC (Ethernet Controller) is a multi-function PCIe Root Complex Integrated Endpoint (RCiEP), the Timer is one of its functions which provides current time with nanosecond resolution, precise periodic pulse, pulse on timeout (alarm), and time capture on external pulse support. And also supports time synchronization as required for IEEE 1588 and IEEE 802.1AS-2020. So add device tree binding doc for the PTP clock based on NETC Timer. NETC Timer has three reference clock sources, but the clock mux is inside the IP. Therefore, the driver will parse the clock name to select the desired clock source. If the clocks property is not present, NETC Timer will use the system clock of NETC IP as its reference clock. Because the Timer is a PCIe function of NETC IP, the system clock of NETC is always available to the Timer. Signed-off-by: Wei Fang <wei.fang@nxp.com> Reviewed-by: Frank Li <Frank.Li@nxp.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://patch.msgid.link/20250829050615.1247468-2-wei.fang@nxp.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
64 lines
1.5 KiB
YAML
64 lines
1.5 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/ptp/nxp,ptp-netc.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: NXP NETC V4 Timer PTP clock
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description:
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NETC V4 Timer provides current time with nanosecond resolution, precise
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periodic pulse, pulse on timeout (alarm), and time capture on external
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pulse support. And it supports time synchronization as required for
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IEEE 1588 and IEEE 802.1AS-2020.
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maintainers:
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- Wei Fang <wei.fang@nxp.com>
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- Clark Wang <xiaoning.wang@nxp.com>
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properties:
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compatible:
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enum:
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- pci1131,ee02
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reg:
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maxItems: 1
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clocks:
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maxItems: 1
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description:
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The reference clock of NETC Timer, can be selected between 3 different
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clock sources using an integrated hardware mux TMR_CTRL[CK_SEL].
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The "ccm" means the reference clock comes from CCM of SoC.
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The "ext" means the reference clock comes from external IO pins.
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If not present, indicates that the system clock of NETC IP is selected
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as the reference clock.
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clock-names:
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enum:
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- ccm
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- ext
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required:
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- compatible
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- reg
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allOf:
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- $ref: /schemas/pci/pci-device.yaml
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unevaluatedProperties: false
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examples:
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- |
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pcie {
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#address-cells = <3>;
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#size-cells = <2>;
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ptp-timer@18,0 {
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compatible = "pci1131,ee02";
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reg = <0x00c000 0 0 0 0>;
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clocks = <&scmi_clk 18>;
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clock-names = "ccm";
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};
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};
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