linux-kernel - Re: [PATCH] remoteproc: qcom: Introduce Hexagon V5 based WCSS driver

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Date:   Thu, 7 Jun 2018 14:13:48 +0530
From:   Vinod <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Sricharan R <sricharan@...eaurora.org>, ohad@...ery.com,
        robh+dt@...nel.org, mark.rutland@....com, andy.gross@...aro.org,
        david.brown@...aro.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        sibis@...eaurora.org
Subject: Re: [PATCH] remoteproc: qcom: Introduce Hexagon V5 based WCSS driver

On 06-06-18, 21:24, Bjorn Andersson wrote:
> On Wed 06 Jun 21:11 PDT 2018, Vinod wrote:
> 
> > So, wouldn't Kconfig syntax something like where we say:
> >         M if RPMSG_QCOM_GLINK_SMEM=m
> >         bool if RPMSG_QCOM_GLINK_SMEM=y
> > 
> 
> If we ignore SMD for a while we have the following combinations:
> 
> glink/wcss
> y     y - valid
> y     m - valid
> y     n - valid
> m     y - link failure (invalid)
> m     m - valid
> m     n - valid
> n     y - valid (platform uses wcss, but not glink)
> n     m - valid (-----"-----)
> n     n - valid
> 
> So to distill this we have the two valid cases:
> module/no if RPMSG_QCOM_GLINK_SMEM=m
> yes/module/no if RPMSG_QCOM_GLINK_SMEM=y
> 
> and the way you express that in Kconfig is the somewhat awkward
> 
>   depends on RPMSG_QCOM_GLINK_SMEM || RPMSG_QCOM_GLINK_SMEM=n

Understood now :) Yes it is awkward..

Btw we seem to have issue with link fail here when glink is m and wcss
is y. Why don't we see link fail for glink being n? Yes I understand that
platform uses wcss but am curious how that works out :)

Thanks
-- 
~Vinod