linux-kernel - Re: [patch v23 1/4] drivers: jtag: Add JTAG core driver

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Date:   Tue, 29 May 2018 15:09:48 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Oleksandr Shamray <oleksandrs@...lanox.com>
Cc:     arnd@...db.de, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        openbmc@...ts.ozlabs.org, joel@....id.au, jiri@...nulli.us,
        tklauser@...tanz.ch, linux-serial@...r.kernel.org,
        vadimp@...lanox.com, system-sw-low-level@...lanox.com,
        robh+dt@...nel.org, openocd-devel-owner@...ts.sourceforge.net,
        linux-api@...r.kernel.org, davem@...emloft.net, mchehab@...nel.org
Subject: Re: [patch v23 1/4] drivers: jtag: Add JTAG core driver

On Tue, May 29, 2018 at 02:49:02PM +0300, Oleksandr Shamray wrote:
> +static int jtag_release(struct inode *inode, struct file *file)
> +{
> +	return 0;
> +}

If you do not do anything, then there is no need to have this callback
at all, right?

> +/**
> + * enum jtag_endstate:
> + *
> + * @JTAG_STATE_IDLE: JTAG state machine IDLE state
> + * @JTAG_STATE_PAUSEIR: JTAG state machine PAUSE_IR state
> + * @JTAG_STATE_PAUSEDR: JTAG state machine PAUSE_DR state
> + */
> +enum jtag_endstate {
> +	JTAG_STATE_IDLE,
> +	JTAG_STATE_PAUSEIR,
> +	JTAG_STATE_PAUSEDR,

Be specific with these enums, set them to a value so you know all is
good.  Userspace C compilers can be funny at times.

Otherwise, looks really good, nice work.

greg k-h