linux-kernel - Re: [net-next PATCH 2/5] soc: ti: K2G: provide APIs to support driver probe deferral

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Date:   Mon, 26 Mar 2018 22:48:02 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Murali Karicheri <m-karicheri2@...com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, ssantosh@...nel.org,
        malat@...ian.org, w-kwok2@...com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [net-next PATCH 2/5] soc: ti: K2G: provide APIs to support
 driver probe deferral

On Mon, Mar 26, 2018 at 04:15:09PM -0400, Murali Karicheri wrote:
> This patch provide APIs to allow client drivers to support
> probe deferral. On K2G SoC, devices can be probed only
> after the ti_sci_pm_domains driver is probed and ready.
> As drivers may get probed at different order, any driver
> that depends on knav dma and qmss drivers, for example
> netcp network driver, needs to defer probe until
> knav devices are probed and ready to service. To do this,
> add an API to query the device ready status from the knav
> dma and qmss devices.

Hi Murali 

Shouldn't you really re-write this to be a dma driver?  You would then
do something like of_dma_request_slave_channel() in the ethernet
driver probe function. That probably correctly returns EPROBE_DEFER.

       Andrew