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On many Qualcomm platforms the PMIC RTC control and time registers are read-only so that the RTC time can not be updated. Instead an offset needs be stored in some machine-specific non-volatile memory, which a driver can take into account. On platforms where the offset is stored in a Qualcomm specific UEFI variable the variables are also accessed in a non-standard way, which means that the OS cannot assume that the variable service is available by the time the RTC driver probes. Add a 'qcom,uefi-rtc-info' boolean flag to indicate that the RTC offset is stored in a Qualcomm specific UEFI variable so that the OS can determine whether to wait for it to become available. The UEFI variable is 882f8c2b-9646-435f-8de5-f208ff80c1bd-RTCInfo and holds a 12-byte structure where the first four bytes is a GPS time offset in little-endian byte order. Link: https://lore.kernel.org/all/aAecIkgmTTlThKEZ@hovoldconsulting.com/ Signed-off-by: Johan Hovold <johan+linaro@kernel.org> Acked-by: Rob Herring (Arm) <robh@kernel.org> Link: https://lore.kernel.org/r/20250423075143.11157-2-johan+linaro@kernel.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
99 lines
2.1 KiB
YAML
99 lines
2.1 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/rtc/qcom-pm8xxx-rtc.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Qualcomm PM8xxx PMIC RTC device
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maintainers:
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- Satya Priya <quic_c_skakit@quicinc.com>
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properties:
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compatible:
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oneOf:
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- enum:
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- qcom,pm8058-rtc
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- qcom,pm8921-rtc
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- qcom,pm8941-rtc
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- qcom,pmk8350-rtc
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- items:
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- enum:
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- qcom,pm8018-rtc
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- const: qcom,pm8921-rtc
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reg:
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minItems: 1
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maxItems: 2
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reg-names:
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minItems: 1
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items:
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- const: rtc
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- const: alarm
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interrupts:
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maxItems: 1
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allow-set-time:
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$ref: /schemas/types.yaml#/definitions/flag
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description:
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Indicates that the setting of RTC time is allowed by the host CPU.
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nvmem-cells:
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items:
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- description:
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four-byte nvmem cell holding a little-endian offset from the Unix
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epoch representing the time when the RTC timer was last reset
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nvmem-cell-names:
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items:
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- const: offset
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qcom,no-alarm:
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type: boolean
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description:
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RTC alarm is not owned by the OS
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qcom,uefi-rtc-info:
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type: boolean
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description:
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RTC offset is stored as a four-byte GPS time offset in a 12-byte UEFI
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variable 882f8c2b-9646-435f-8de5-f208ff80c1bd-RTCInfo
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wakeup-source: true
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required:
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- compatible
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- reg
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- interrupts
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/interrupt-controller/irq.h>
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#include <dt-bindings/spmi/spmi.h>
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spmi {
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#address-cells = <2>;
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#size-cells = <0>;
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pmic@0 {
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compatible = "qcom,pm8941", "qcom,spmi-pmic";
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reg = <0x0 SPMI_USID>;
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#address-cells = <1>;
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#size-cells = <0>;
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rtc@6000 {
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compatible = "qcom,pm8941-rtc";
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reg = <0x6000>, <0x6100>;
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reg-names = "rtc", "alarm";
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interrupts = <0x0 0x61 0x1 IRQ_TYPE_EDGE_RISING>;
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nvmem-cells = <&rtc_offset>;
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nvmem-cell-names = "offset";
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};
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};
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};
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...
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