linux-kernel - Re: [PATCH v3 3/4] docs: Add documentation for user space client interface

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Date:   Fri, 19 Jun 2020 12:09:48 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Hemant Kumar <hemantk@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        jhugo@...eaurora.org, bbhatt@...eaurora.org
Subject: Re: [PATCH v3 3/4] docs: Add documentation for user space client
 interface

On Thu, Jun 11, 2020 at 11:13:43AM -0700, Hemant Kumar wrote:
> MHI user space client driver is creating device file node
> for user application to perform file operations. File
> operations are handled by MHI core driver. Currently
> Loopback MHI channel is supported by this driver.
> 
> Signed-off-by: Hemant Kumar <hemantk@...eaurora.org>
> ---
>  Documentation/mhi/index.rst |  1 +
>  Documentation/mhi/uci.rst   | 19 +++++++++++++++++++
>  2 files changed, 20 insertions(+)
>  create mode 100644 Documentation/mhi/uci.rst
> 
> diff --git a/Documentation/mhi/index.rst b/Documentation/mhi/index.rst
> index 1d8dec3..c75a371 100644
> --- a/Documentation/mhi/index.rst
> +++ b/Documentation/mhi/index.rst
> @@ -9,6 +9,7 @@ MHI
>  
>     mhi
>     topology
> +   uci
>  
>  .. only::  subproject and html
>  
> diff --git a/Documentation/mhi/uci.rst b/Documentation/mhi/uci.rst
> new file mode 100644
> index 0000000..a5c5c4f
> --- /dev/null
> +++ b/Documentation/mhi/uci.rst
> @@ -0,0 +1,19 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +=================================
> +User space Client Interface (UCI)

Stick to 'Userspace' everywhere.

> +=================================
> +
> +UCI driver enables user space clients to communicate to external MHI devices
> +like modem and WLAN. It creates standard character device file nodes for user

UCI driver creates a single char device, isn't it?

> +space clients to perform open, read, write, pool and close file operations.
> +

poll? Btw, you need to mention explicitly how this char device can be used.
You are just mentioning standard file operations.

> +Device file node is created with format:-
> +
> +/dev/mhi_<controller_name>_<mhi_device_name>
> +
> +controller_name is the name of underlying bus used to transfer data.

underlying controller instance.

> +mhi_device_name is the name of the MHI channel being used by MHI client

What do you mean by MHI client here? Are you referring to userspace client?

> +to send or receive data using MHI protocol. MHI channels are statically
> +defined by MHI specification. Driver currently supports LOOPBACK channel
> +index 0 (Host to device) and 1 (Device to Host).

s/index/identifier

And explain a bit on how this LOOPBACK channel is getting used.

Thanks,
Mani

> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>