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    SubjectRe: [PATCH v1] can: mcp251xfd: Add some sysfs debug interfaces for registers r/w
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    在 2021/1/22 下午3:22, Marc Kleine-Budde 写道:
    > On 1/22/21 7:22 AM, Su Yanjun wrote:
    >> When i debug mcp2518fd, some method to track registers is
    >> needed. This easy debug interface will be ok.
    > NACK
    >
    > As the driver uses regmap, everything should be there already.
    >
    > To read use:
    >
    > | cat /sys/kernel/debug/regmap/spi0.0-crc/registers
    >
    > Register write support for devices that are handles by proper kernel drivers is
    > a pure debugging tool, thus not enabled by default, not even with a Kconfig
    > switch. You have to enable it manually, have a look at commit:
    >
    > 09c6ecd39410 regmap: Add support for writing to regmap registers via debugfs

    You're right.

    Thank you

    >
    > regards,
    > Marc
    >

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