linux-kernel - Re: [PATCH 1/3] usb: gadget: aspeed: read vhub config from of_device

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Date:   Tue, 11 Feb 2020 18:37:47 -0800
From:   Tao Ren <rentao.bupt@...il.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Joel Stanley <joel@....id.au>, Mark Rutland <mark.rutland@....com>,
        Felipe Balbi <balbi@...nel.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        devicetree <devicetree@...r.kernel.org>,
        Andrew Jeffery <andrew@...id.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Colin Ian King <colin.king@...onical.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/3] usb: gadget: aspeed: read vhub config from
 of_device_id

On Tue, Feb 11, 2020 at 09:50:42AM +0100, Benjamin Herrenschmidt wrote:
> On Mon, 2020-02-10 at 11:07 -0800, Tao Ren wrote:
> > > > This looks generally okay. We should wait for Ben's ack before
> > > > applying.
> > > 
> > > Shouldn't we instead have DT fields indicating those values ?
> > 
> > May I ask why we prefer adding dt fields (such as "aspeed,vhub-max-ports"
> > and "aspeed,vhub-max-endpoints") instead of assigning these values based
> > on aspeed family? For example, is it to allow users to set a smaller
> > number of ports/endpoints?
> 
> It's not a strong drive but it makes it more convenient to add support
> to newer revisions if the only differences are those numbers.

Got it. Thanks for the clarify. Will send out v2 patches after more
testing.

> > 
> > > Also we should add a DT representation for the various ID/strings of
> > > the hub itself so manufacturers can customize them.
> > 
> > Sure. I will add DT nodes for vendor/product/device IDs/strings. As it's
> > not directly related to ast2600-support, shall I handle it in a separate
> > patch? Or I can include the patch in this patch series?
> 
> Separate. Thanks !

Will take care of the change once this patch series is accepted.


Cheers,

Tao
> 
> Cheers,
> Ben.
> 
>