linux-kernel - Re: [PATCH v2 2/2] dt-bindings: net: bluetooth: Add device property nvm-postfix for QCA6174

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Date:   Tue, 9 Apr 2019 08:54:08 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Marc Gonzalez <marc.w.gonzalez@...e.fr>
Cc:     Rocky Liao <rjliao@...eaurora.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>
Subject: Re: [PATCH v2 2/2] dt-bindings: net: bluetooth: Add device property
 nvm-postfix for QCA6174

On Thu, Apr 4, 2019 at 7:32 AM Marc Gonzalez <marc.w.gonzalez@...e.fr> wrote:
>
> +robh
>
> On 04/04/2019 11:08, Rocky Liao wrote:
>
> > This patchs patch adds an optional device property nvm-postfix to allow the
> > driver to load customized nvm file based on this property
>
> While text /before/ is indeed called a "prefix", text /after/ is not a "postfix",
> but a "suffix".
>
>
> >  Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt b/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
> > index 824c0e2..70cda4b 100644
> > --- a/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
> > +++ b/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
> > @@ -16,6 +16,7 @@ Optional properties for compatible string qcom,qca6174-bt:
> >
> >   - enable-gpios: gpio specifier used to enable chip
> >   - clocks: clock provided to the controller (SUSCLK_32KHZ)
> > + - nvm-postfix: nvm file postfix to load customized nvm file
>
> The device tree is supposed to describe hardware.
>
> The name of which file to load can hardly be considered part of the HW.
>
> Possible solutions:
> 1) derive the file name from the compatible string
> 2) pass the name as a module parameter
> 3) something else

Or use the 'firmware-name' property to define the full firmware filename.

Rob