linux-kernel - Re: [PATCH V6 1/3] rpmsg: core: Add signal API support

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Message-ID: <480c5a09-e6c1-eeb6-fa14-7190f22cf727@quicinc.com>
Date:   Wed, 19 Apr 2023 23:08:55 -0700
From:   Trilok Soni <quic_tsoni@...cinc.com>
To:     Sarannya S <quic_sarannya@...cinc.com>,
        <quic_bjorande@...cinc.com>, <arnaud.pouliquen@...s.st.com>,
        <swboyd@...omium.org>, <quic_clew@...cinc.com>,
        <mathieu.poirier@...aro.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>,
        Deepak Kumar Singh <quic_deesin@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>
Subject: Re: [PATCH V6 1/3] rpmsg: core: Add signal API support

On 4/19/2023 6:53 AM, Sarannya S wrote:
> From: Deepak Kumar Singh <quic_deesin@...cinc.com>
> 
> Some transports like Glink support the state notifications between
> clients using flow control signals similar to serial protocol signals.
> Local glink client drivers can send and receive flow control status
> to glink clients running on remote processors.
> 
> Add APIs to support sending and receiving of flow control status by
> rpmsg clients.
> 
> Signed-off-by: Deepak Kumar Singh <quic_deesin@...cinc.com>
> Signed-off-by: Sarannya S <quic_sarannya@...cinc.com>
> ---
>   drivers/rpmsg/rpmsg_core.c     | 21 +++++++++++++++++++++
>   drivers/rpmsg/rpmsg_internal.h |  2 ++
>   include/linux/rpmsg.h          | 15 +++++++++++++++
>   3 files changed, 38 insertions(+)
> 
> diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
> index a2207c0..cd71a6a 100644
> --- a/drivers/rpmsg/rpmsg_core.c
> +++ b/drivers/rpmsg/rpmsg_core.c
> @@ -331,6 +331,25 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
>   EXPORT_SYMBOL(rpmsg_trysend_offchannel);
>   
>   /**
> + * rpmsg_set_flow_control() - sets/clears serial flow control signals
> + * @ept:	the rpmsg endpoint
> + * @enable:	pause/resume incoming data flow	
> + * @dst:	destination address of the endpoint
> + *
> + * Return: 0 on success and an appropriate error value on failure.
> + */
> +int rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool enable, u32 dst)
> +{
> +	if (WARN_ON(!ept))
> +		return -EINVAL;
> +	if (!ept->ops->set_flow_control)
> +		return -ENXIO;
> +
> +	return ept->ops->set_flow_control(ept, enable, dst);
> +}
> +EXPORT_SYMBOL(rpmsg_set_flow_control);

Why not EXPORT_SYMBOL_GPL?

---Trilok Soni