linux-kernel - Re: [PATCH V0 4/7] usb: common: eud: Added the driver support for Embedded USB Debugger(EUD)

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Date:   Mon, 4 Oct 2021 13:08:01 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Souradeep Chowdhury <schowdhu@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        devicetree@...r.kernel.org,
        Bryan O'Donoghue <pure.logic@...us-software.ie>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg KH <greg@...ah.com>
Cc:     linux-kernel@...r.kernel.org, ckadabi@...eaurora.org,
        tsoni@...eaurora.org, bryanh@...eaurora.org,
        psodagud@...eaurora.org, satyap@...eaurora.org,
        pheragu@...eaurora.org, Rajendra Nayak <rnayak@...eaurora.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Subject: Re: [PATCH V0 4/7] usb: common: eud: Added the driver support for
 Embedded USB Debugger(EUD)

On 10/4/21 4:16 AM, Souradeep Chowdhury wrote:
> Add support for control peripheral of EUD (Embedded USB Debugger) to
> listen to events such as USB attach/detach, pet EUD to indicate software

   I don't quite understand: what pets the EUD? how does it do that?

> is functional.Reusing the platform device kobj, sysfs entry 'enable' is

      functional. Reusing

> created to enable or disable EUD.
> 
> To enable the eud the following needs to be done
> echo 1 >/sys/bus/platform/.../enable
> 
> To disable eud, following is the command
> echo 0 >/sys/bus/platform/.../enable
> 
> Signed-off-by: Souradeep Chowdhury<schowdhu@...eaurora.org>
> ---
>   Documentation/ABI/testing/sysfs-driver-eud |   7 +
>   drivers/usb/common/Kconfig                 |   9 +
>   drivers/usb/common/Makefile                |   1 +
>   drivers/usb/common/qcom_eud.c              | 256 +++++++++++++++++++++++++++++
>   4 files changed, 273 insertions(+)
>   create mode 100644 Documentation/ABI/testing/sysfs-driver-eud
>   create mode 100644 drivers/usb/common/qcom_eud.c
> 
> diff --git a/Documentation/ABI/testing/sysfs-driver-eud b/Documentation/ABI/testing/sysfs-driver-eud
> new file mode 100644
> index 0000000..14a02da
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-driver-eud
> @@ -0,0 +1,7 @@
> +What:		/sys/bus/platform/.../enable
> +Date:           October 2021
> +Contact:        Souradeep Chowdhury<schowdhu@...eaurora.org>
> +Description:
> +		The Enable/Disable sysfs interface for Embedded
> +		USB Debugger(EUD).This enables and disables the

		    Debugger (EUD). This enables

> +		EUD based on a 1 or a 0 value.


-- 
~Randy