linux-kernel - Re: [PATCH] mailbox: add support for doorbell/signal mode controllers

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Message-ID: <20171101221709.GB28761@minitux>
Date:   Wed, 1 Nov 2017 15:17:09 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     Jassi Brar <jassisinghbrar@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] mailbox: add support for doorbell/signal mode controllers

On Wed 01 Nov 11:15 PDT 2017, Sudeep Holla wrote:
> 
>  80         writel_relaxed(msg->cmd, mb->mbox_base +
> MAILBOX_A2B_CMD(chans->idx));
>  81         writel_relaxed(msg->rx_size, mb->mbox_base +
> 
>  82                        MAILBOX_A2B_DAT(chans->idx));
> 
>  83

This is just terrible, using the void *mssg to pass a struct which is
interpreted by the controller removes any form of abstraction provided
by the framework.

In my view the void *mssg should point to the data to be written in the
mailbox register, and hence might be of different size - but only of
native type.

Regards,
Bjorn