linux-kernel - Re: [PATCH 2/4] soc: qcom: aoss: Add debugfs interface for sending messages

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Message-ID: <ZMfOhJI0FNXFwenb@kernel.org>
Date:   Mon, 31 Jul 2023 17:08:52 +0200
From:   Simon Horman <horms@...nel.org>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Chris Lew <quic_clew@...cinc.com>,
        Alex Elder <elder@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH 2/4] soc: qcom: aoss: Add debugfs interface for sending
 messages

On Sun, Jul 30, 2023 at 09:10:11PM -0700, Bjorn Andersson wrote:
> From: Chris Lew <clew@...eaurora.org>
> 
> In addition to the normal runtime commands, the Always On Processor
> (AOP) provides a number of debug commands which can be used during
> system debugging for things such as preventing power collapse or placing
> floor votes for certain resources. Some of these are documented in the
> Robotics RB5 "Debug AOP ADB" linked below.
> 
> Provide a debugfs interface for the developer/tester to send these
> commands to the AOP.
> 
> Link: https://docs.qualcomm.com/bundle/publicresource/topics/80-88500-3/85_Debugging_AOP_ADB.html
> Signed-off-by: Chris Lew <clew@...eaurora.org>
> [bjorn: Dropped debugfs guards, improve error codes, rewrote commit message]
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
>  drivers/soc/qcom/qcom_aoss.c | 33 +++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
> 
> diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
> index 5e74332515cf..4c5bb7034fff 100644
> --- a/drivers/soc/qcom/qcom_aoss.c
> +++ b/drivers/soc/qcom/qcom_aoss.c
> @@ -3,6 +3,7 @@
>   * Copyright (c) 2019, Linaro Ltd
>   */
>  #include <linux/clk-provider.h>
> +#include <linux/debugfs.h>
>  #include <linux/interrupt.h>
>  #include <linux/io.h>
>  #include <linux/mailbox_client.h>
> @@ -82,6 +83,7 @@ struct qmp {
>  
>  	struct clk_hw qdss_clk;
>  	struct qmp_cooling_device *cooling_devs;
> +	struct dentry *debugfs_file;

Hi Bjorn,

Please consider adding debugfs_file to the kernel doc for struct qmp.

>  };
>  
>  static void qmp_kick(struct qmp *qmp)

...