linux-kernel - Re: [PATCH v7 2/2] tty: add rpmsg driver

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Message-ID: <66fe1087-1a6d-1a96-a043-8013bfb6f2c1@st.com>
Date:   Wed, 25 Mar 2020 12:36:30 +0100
From:   Arnaud POULIQUEN <arnaud.pouliquen@...com>
To:     Joe Perches <joe@...ches.com>, Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, <linux-kernel@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     Suman Anna <s-anna@...com>,
        Fabien DESSENNE <fabien.dessenne@...com>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        xiang xiao <xiaoxiang781216@...il.com>
Subject: Re: [PATCH v7 2/2] tty: add rpmsg driver



On 3/24/20 6:23 PM, Joe Perches wrote:
> On Tue, 2020-03-24 at 18:04 +0100, Arnaud Pouliquen wrote:
>> This driver exposes a standard TTY interface on top of the rpmsg
>> framework through a rpmsg service.
>>
>> This driver supports multi-instances, offering a /dev/ttyRPMSGx entry
>> per rpmsg endpoint.
> 
> trivial notes:
> 
>> diff --git a/Documentation/serial/tty_rpmsg.rst b/Documentation/serial/tty_rpmsg.rst
> []
>> +The rpmsg tty driver implements serial communication on the RPMsg bus to makes possible for user-space programs to send and receive rpmsg messages as a standard tty protocol.
> 
> Very long text lines missing newlines?
> 
> []
>> +To be compliant with this driver, the remote firmware must create its data end point associated with the "rpmsg-tty-raw" service.
> []
>> +To be compatible with this driver, the remote firmware must create or use its end point associated with "rpmsg-tty-ctrl" service, plus a second endpoint for the data flow.
>> +On Linux rpmsg_tty probes, the data endpoint address and the CTS (set to disable)
> 
> []
> 
>> diff --git a/drivers/tty/rpmsg_tty.c b/drivers/tty/rpmsg_tty.c
> []
>> +typedef void (*rpmsg_tty_rx_cb_t)(struct rpmsg_device *, void *, int, void *,
>> +				  u32);
> 
> unused typedef?

yes i will clean it.

> 
> []
> 
>> +static int __init rpmsg_tty_init(void)
>> +{
> []
>> +	err = tty_register_driver(rpmsg_tty_driver);
>> +	if (err < 0) {
>> +		pr_err("Couldn't install rpmsg tty driver: err %d\n", err);
>> +		goto error_put;
>> +	}
> 
> Might use vsprintf extension %pe
> 
> 		pr_err("Couldn't install rpmsg tty driver: %pe\n", ERR_PTR(err));

Seems not possible here as err is an integer value and not a pointer cast to an integer,
or I missed something?


Thanks for the review,
Arnaud
> 
>> +	err = register_rpmsg_driver(&rpmsg_tty_rpmsg_drv);
>> +	if (err < 0) {
>> +		pr_err("Couldn't register rpmsg tty driver: err %d\n", err);
> 
> etc.
> 
>