linux-kernel - Re: [PATCH 1/2] dt-bindings: spi: Add Spreadtrum ADI controller documentation

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Date:   Thu, 7 Sep 2017 12:44:01 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Baolin Wang <baolin.wang@...eadtrum.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: spi: Add Spreadtrum ADI controller
 documentation

On Thu, Sep 07, 2017 at 07:03:18PM +0800, Baolin Wang wrote:
> On 7 September 2017 at 17:54, Mark Brown <broonie@...nel.org> wrote:
> > On Thu, Sep 07, 2017 at 11:29:05AM +0800, Baolin Wang wrote:

> >> The hwspinlock name should be "adi", and I will make it clear in next version.

> > So there's other drivers that might also be accessing this IP block?

> Yes. Other drivers (like regulator, RTC or charger ... ) can access
> analog chip (like PMIC) by ADI controller. But the hardware spinlock
> is used to synchronize between the multiple subsystems, since we only
> have one ADI controller.

If it were other drivers then the kernel should already be doing that
but...

> > So does this driver control all the channels or are there other drivers
> > (or hardware components) that control some of the other channels?

> The ADI driver only controls 2 software channels (read/write), and
> other hardware channels can be controlled by hardware components if we
> set the hardware config.

...if it can be configured to allow other things to use it independently
then this is fine, just needs a bit more documentation so someone can
understand how the bindings and hardware match up.

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