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

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Message-ID: <7181a6a3-62c6-9021-ea63-827f55eacd98@pengutronix.de>
Date:   Fri, 22 Jan 2021 08:22:43 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Su Yanjun <suyanjun218@...il.com>,
        manivannan.sadhasivam@...aro.org, thomas.kopp@...rochip.com,
        wg@...ndegger.com, davem@...emloft.net, kuba@...nel.org,
        lgirdwood@...il.com, broonie@...nel.org
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] can: mcp251xfd: Add some sysfs debug interfaces for
 registers r/w

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  |
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