Subject: Re: [PATCH 08/10] mtd: flash-sam: Bindings for Juniper's SAM FPGA flash
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From: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
In-Reply-To: <20161010200704.GA28870@rob-hp-laptop>
Date: Mon, 17 Oct 2016 22:03:35 +0300
Cc: Lee Jones <lee.jones@linaro.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Alexandre Courbot <gnurou@gmail.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Frank Rowand <frowand.list@gmail.com>,
        Wolfram Sang <wsa@the-dreams.de>,
        David Woodhouse <dwmw2@infradead.org>,
        Brian Norris <computersforpeace@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Wim Van Sebroeck <wim@iguana.be>, Peter Rosin <peda@axentia.se>,
        Debjit Ghosh <dghosh@juniper.net>, Georgi Vlaev <gvlaev@juniper.net>,
        Guenter Roeck <linux@roeck-us.net>, Maryam Seraj <mseraj@juniper.net>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org,
        linux-mtd@lists.infradead.org, linux-watchdog@vger.kernel.org,
        netdev@vger.kernel.org
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References: <1475853518-22264-1-git-send-email-pantelis.antoniou@konsulko.com> <1475853518-22264-9-git-send-email-pantelis.antoniou@konsulko.com> <20161010200704.GA28870@rob-hp-laptop>
To: Rob Herring <robh@kernel.org>
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Hi Rob,

> On Oct 10, 2016, at 23:07 , Rob Herring <robh@kernel.org> wrote:
> 
> gOn Fri, Oct 07, 2016 at 06:18:36PM +0300, Pantelis Antoniou wrote:
>> From: Georgi Vlaev <gvlaev@juniper.net>
>> 
>> Add binding document for Junipers Flash IP block present
>> in the SAM FPGA on PTX series of routers.
>> 
>> Signed-off-by: Georgi Vlaev <gvlaev@juniper.net>
>> [Ported from Juniper kernel]
>> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
>> ---
>> .../devicetree/bindings/mtd/flash-sam.txt          | 31 ++++++++++++++++++++++
>> 1 file changed, 31 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/mtd/flash-sam.txt
>> 
>> diff --git a/Documentation/devicetree/bindings/mtd/flash-sam.txt b/Documentation/devicetree/bindings/mtd/flash-sam.txt
>> new file mode 100644
>> index 0000000..bdf1d78
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mtd/flash-sam.txt
>> @@ -0,0 +1,31 @@
>> +Flash device on a Juniper SAM FPGA
>> +
>> +These flash chips are found in the PTX series of Juniper routers.
>> +
>> +They are regular CFI compatible (Intel or AMD extended) flash chips with
>> +some special write protect/VPP bits that can be controlled by the machine's
>> +system controller.
> 
> And where's the description of the sys ctrlr?
> 

The system controller is Juniper IP. We’ll have to ask around about
specifics, and it’s pretty uninspiring stuff.

>> +
>> +Required properties:
>> +- compatible : must be "jnx,flash-sam"
>> +
>> +Optional properties:
>> +- reg : memory address for the flash chip, note that this is not
>> +required since usually the device is a subdevice of the SAM MFD
>> +driver which fills in the register fields.
>> +
>> +For the rest of the properties, see mtd-physmap.txt.
>> +
>> +The device tree may optionally contain sub-nodes describing partitions of the
>> +address space. See partition.txt for more detail.
>> +
>> +Example:
>> +
>> +flash_sam {
>> +	compatible = "jnx,flash-sam";
>> +	partition@0 {
> 
> This should have a heirarchy of a controller node, a flash child node, 
> partitions child node, and partition child nodes.
> 

OK.

>> +		reg = <0x0 0x400000>;
>> +		label = "pic0-golden";
>> +		read-only;
>> +	};
>> +};
>> -- 
>> 1.9.1