linux-kernel - Re: [PATCH 1/2] dt/bindings: Add bindings for Broadcom STB DRAM Sensors

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Message-ID: <CAGt4E5s0uoLjeEhk_srxbr=f_sf-NSVXbW_HEJfjnSiAQU8o=Q@mail.gmail.com>
Date:   Wed, 3 May 2017 15:29:10 -0700
From:   Markus Mayer <markus.mayer@...adcom.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Mark Rutland <mark.rutland@....com>,
        Broadcom Kernel List <bcm-kernel-feedback-list@...adcom.com>,
        Linux HWMON List <linux-hwmon@...r.kernel.org>,
        Device Tree List <devicetree@...r.kernel.org>,
        ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH 1/2] dt/bindings: Add bindings for Broadcom STB DRAM Sensors

Hi Rob,

On 27 April 2017 at 15:00, Florian Fainelli <f.fainelli@...il.com> wrote:
> On 04/27/2017 02:57 PM, Rob Herring wrote:
>>>>> +Optional properties:
>>>>> +  - cell-index: the index of the DPFE instance; will default to 0 if not set
>>
>> Don't use cell-index. It's not a valid property for FDT (only real
>> OpenFirmware).
>
> My bad, I was advising Markus to use this property since it was largely
> used throughout Documentation/devicetree/bindings/. What would be a more
> appropriate way to have the same information? Aliases?

Hopefully this will be the last time we need to pester you about this.
What should we be using instead of cell-index to identify multiple
instances of a device?

To give you an idea of what the code looks like right now:

ret = of_property_read_u32(dev->of_node, "cell-index", &index);
if (ret)
    index = 0;
[...]
dev_set_name(dpfe_dev, "dpfe%u", index);
ret = device_register(dpfe_dev);

Enumerating the devices like this is what we are after.

Thanks,
-Markus