linux-kernel - Re: [PATCH 06/20] bus: mhi: ep: Add support for registering MHI endpoint client drivers

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Date:   Wed, 5 Jan 2022 18:27:33 -0600
From:   Alex Elder <elder@...e.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        mhi@...ts.linux.dev
Cc:     hemantk@...eaurora.org, bbhatt@...eaurora.org,
        quic_jhugo@...cinc.com, vinod.koul@...aro.org,
        bjorn.andersson@...aro.org, dmitry.baryshkov@...aro.org,
        skananth@...eaurora.org, vpernami@...eaurora.org,
        vbadigan@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/20] bus: mhi: ep: Add support for registering MHI
 endpoint client drivers

On 12/2/21 5:35 AM, Manivannan Sadhasivam wrote:
> This commit adds support for registering MHI endpoint client drivers
> with the MHI endpoint stack. MHI endpoint client drivers binds to one
> or more MHI endpoint devices inorder to send and receive the upper-layer
> protocol packets like IP packets, modem control messages, and diagnostics
> messages over MHI bus.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>   drivers/bus/mhi/ep/main.c | 85 +++++++++++++++++++++++++++++++++++++++
>   include/linux/mhi_ep.h    | 53 ++++++++++++++++++++++++
>   2 files changed, 138 insertions(+)
> 
> diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c
> index db664360c8ab..ce0f99f22058 100644
> --- a/drivers/bus/mhi/ep/main.c
> +++ b/drivers/bus/mhi/ep/main.c
> @@ -193,9 +193,88 @@ void mhi_ep_unregister_controller(struct mhi_ep_cntrl *mhi_cntrl)
>   }
>   EXPORT_SYMBOL_GPL(mhi_ep_unregister_controller);
>   
> +static int mhi_ep_driver_probe(struct device *dev)
> +{
> +	struct mhi_ep_device *mhi_dev = to_mhi_ep_device(dev);
> +	struct mhi_ep_driver *mhi_drv = to_mhi_ep_driver(dev->driver);
> +	struct mhi_ep_chan *ul_chan = mhi_dev->ul_chan;
> +	struct mhi_ep_chan *dl_chan = mhi_dev->dl_chan;
> +

Either ul_chan or dl_chan must be set, right?  Check this.
Otherwise I think this looks OK.

					-Alex

> +	if (ul_chan)
> +		ul_chan->xfer_cb = mhi_drv->ul_xfer_cb;
> +
> +	if (dl_chan)
> +		dl_chan->xfer_cb = mhi_drv->dl_xfer_cb;
> +
> +	return mhi_drv->probe(mhi_dev, mhi_dev->id);
> +}

. . .