Re: [PATCH v1] can: mcp251xfd: Add some sysfs debug interfaces for registers r/w

[Su]

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