linux-kernel - Re: [PATCH v2 2/2] remoteproc: core: Register the character device interface

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Date:   Wed, 1 Apr 2020 12:52:11 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Rishabh Bhatnagar <rishabhb@...eaurora.org>
Cc:     linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        psodagud@...eaurora.org, tsoni@...eaurora.org,
        sidgup@...eaurora.org
Subject: Re: [PATCH v2 2/2] remoteproc: core: Register the character device
 interface

On Tue 31 Mar 17:03 PDT 2020, Rishabh Bhatnagar wrote:

> Add the character device during rproc_add. This would create
> a character device node at /dev/remoteproc<index>. Userspace
> applications can interact with the remote processor using this
> interface.
> 
> Signed-off-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
> ---

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

>  drivers/remoteproc/remoteproc_core.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 097f33e..76ba171 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1916,6 +1916,13 @@ int rproc_add(struct rproc *rproc)
>  	/* create debugfs entries */
>  	rproc_create_debug_dir(rproc);
>  
> +	/* add char device for this remoteproc */
> +	ret = rproc_char_device_add(rproc);
> +	if (ret) {
> +		dev_err(dev, "Failed to add char dev for %s\n", rproc->name);
> +		return ret;
> +	}
> +
>  	/* if rproc is marked always-on, request it to boot */
>  	if (rproc->auto_boot) {
>  		ret = rproc_trigger_auto_boot(rproc);
> @@ -2137,6 +2144,7 @@ int rproc_del(struct rproc *rproc)
>  	mutex_unlock(&rproc->lock);
>  
>  	rproc_delete_debug_dir(rproc);
> +	rproc_char_device_remove(rproc);
>  
>  	/* the rproc is downref'ed as soon as it's removed from the klist */
>  	mutex_lock(&rproc_list_mutex);
> @@ -2220,6 +2228,7 @@ static int __init remoteproc_init(void)
>  {
>  	rproc_init_sysfs();
>  	rproc_init_debugfs();
> +	rproc_init_cdev();
>  
>  	return 0;
>  }
> @@ -2231,6 +2240,7 @@ static void __exit remoteproc_exit(void)
>  
>  	rproc_exit_debugfs();
>  	rproc_exit_sysfs();
> +	rproc_exit_cdev();
>  }
>  module_exit(remoteproc_exit);
>  
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project