[RFC 6/6] bus: Add support for Tegra NOR controller

From: thierry.reding@gmail.com (Thierry Reding)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC 6/6] bus: Add support for Tegra NOR controller
Date: Mon, 25 Jul 2016 12:57:13 +0200	[thread overview]
Message-ID: <20160725105713.GA21170@ulmo.ba.sec> (raw)
In-Reply-To: <CALw8SCXCdVMKgemEyQ-MZbxdthkPCDVzi+3boqtXk1_XNjcz4g@mail.gmail.com>

On Fri, Jul 22, 2016 at 09:18:37PM +0200, Mirza Krak wrote:
> 2016-07-22 11:38 GMT+02:00 Jon Hunter <jonathanh@nvidia.com>:
> >>> The driver should have a remove function given that we can build as a
> >>> module.
> >>
> >> At the moment I do not know what we would do in a remove function and
> >> hence me not adding one.
> >
> > Should just be the inverse of the probe (although there is no inverse
> > for the parsing DT bit). If you don't wish to add a remove, that is
> > fine, but make the driver a 'bool' and not 'tristate' in the Kconfig so
> > it cannot be configured as a module.
> 
> I understand the concept of a remove function, but I use devm_ calls
> for all resources. These should be handled by the device core on a
> driver detach?
> 
> One thing came to mind now that could be done in a remove method and
> that is clearing the CONFIG_GO bit, or I could just do that first on
> probe instead to make sure the controller is stopped.
> 
> Ok, one more thing came to mind, and that is depopulating the child
> devices. Got it remove function it is then.
> 
> >>>> +module_platform_driver_probe(nor_driver, nor_probe);
> >>>
> >>> I would use "tegra_nor" namespace for all the structs, functions, etc.
> >>> However, we may prefer to go with GMI and in which case tegra_gmi_probe,
> >>> etc.
> >>
> >> ACK. Who gets the last call on what we should call the driver? It
> >> seems that we both think GMI is a better name, do we need a third? :).
> >
> > The patches would have to go via Thierry and so ultimately, Thierry.
> > However, I can't imagine he would object to GMI ;-)
> 
> Eagerly awaiting Thierry`s comments :).

Let's go with GMI. The TRM has a mix of GMI vs. SNOR, but as Jon points
out the pinmux doesn't mention SNOR, so in order to hopefully reduce the
confusion, let's stick with GMI.

Thierry
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