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 regards, Marc -- Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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