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    Subject[PATCH V1 0/6] Add driver support for Data Capture and Compare Engine(DCC) for SM8150
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    DCC(Data Capture and Compare) is a DMA engine designed for debugging purposes. In case of a system
    crash or manual software triggers by the user the DCC hardware stores the value at the register
    addresses which can be used for debugging purposes. The DCC driver provides the user with sysfs
    interface to configure the register addresses. The options that the DCC hardware provides include
    reading from registers, writing to registers, first reading and then writing to registers and looping
    through the values of the same register.

    In certain cases a register write needs to be executed for accessing the rest of the registers, also
    the user might want to record the changing values of a particular register with time for which he has
    the option to use the loop feature. The options mentioned above are exposed to the user by sysfs files
    once the driver is probed. The details and usage of this sysfs files are documented in
    Documentation/ABI/testing/sysfs-driver-dcc. As an example if a user wants to configure to store 100 words
    starting from address 0x80000050 he should give inputs as following to the sysfs config file:-

    echo 0x80000050 100 > /sys/bus/platform/devices/.../config

    Similarly if the user wants to write to a register using DCC hardware he should give following input to
    config_write sysfs file:-
    echo 0x80000000 0xFF > /sys/bus/platform/devices/10a2000.dcc/config_write
    All this read and write occurs at crash time or if the user manually invokes a software trigger.

    Souradeep Chowdhury (6):
    dt-bindings: Added the yaml bindings for DCC
    soc: qcom: dcc: Add driver support for Data Capture and Compare
    unit(DCC)
    soc: qcom: dcc: Add the sysfs variables to the Data Capture and
    Compare driver(DCC)
    DCC: Added the sysfs entries for DCC(Data Capture and Compare) driver
    MAINTAINERS: Add the entry for DCC(Data Capture and Compare) driver
    support
    arm64: dts: qcom: sm8150: Add Data Capture and Compare(DCC) support
    node

    Documentation/ABI/testing/sysfs-driver-dcc | 74 +
    .../devicetree/bindings/arm/msm/qcom,dcc.yaml | 49 +
    MAINTAINERS | 8 +
    arch/arm64/boot/dts/qcom/sm8150.dtsi | 7 +
    drivers/soc/qcom/Kconfig | 8 +
    drivers/soc/qcom/Makefile | 1 +
    drivers/soc/qcom/dcc.c | 1551 ++++++++++++++++++++
    7 files changed, 1698 insertions(+)
    create mode 100644 Documentation/ABI/testing/sysfs-driver-dcc
    create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,dcc.yaml
    create mode 100644 drivers/soc/qcom/dcc.c

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    QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
    of Code Aurora Forum, hosted by The Linux Foundation

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