linux-kernel - Re: [PATCH 10/10] mtd: ngpmb_nvram: Add bindings for Juniper's ngpmb NVRAM

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Date:   Mon, 10 Oct 2016 13:18:46 -0500
From:   Rob Herring <robh@...nel.org>
To:     Pantelis Antoniou <pantelis.antoniou@...sulko.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Frank Rowand <frowand.list@...il.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Wim Van Sebroeck <wim@...ana.be>,
        Guenter Roeck <linux@...ck-us.net>,
        Peter Rosin <peda@...ntia.se>,
        Debjit Ghosh <dghosh@...iper.net>,
        Georgi Vlaev <gvlaev@...iper.net>,
        Guenter Roeck <groeck@...iper.net>,
        JawaharBalaji Thirumalaisamy <jawaharb@...iper.net>,
        Rajat Jain <rajatjain@...iper.net>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-watchdog@...r.kernel.org
Subject: Re: [PATCH 10/10] mtd: ngpmb_nvram: Add bindings for Juniper's ngpmb
 NVRAM

On Fri, Oct 07, 2016 at 06:17:31PM +0300, Pantelis Antoniou wrote:
> From: Georgi Vlaev <gvlaev@...iper.net>
> 
> Add device tree binging document for the ngpmb NVRAM device.
> 
> Signed-off-by: Georgi Vlaev <gvlaev@...iper.net>
> [Ported from Juniper kernel]
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
> ---
>  .../devicetree/bindings/mtd/ngpmb-nvram.txt        | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/ngpmb-nvram.txt
> 
> diff --git a/Documentation/devicetree/bindings/mtd/ngpmb-nvram.txt b/Documentation/devicetree/bindings/mtd/ngpmb-nvram.txt
> new file mode 100644
> index 0000000..297ad0e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/ngpmb-nvram.txt

mtd is really flash. sram/ or nvmem/ are probably better choices.

> @@ -0,0 +1,22 @@
> +Non Volatile RAM device on a Juniper NG PMB FPGA
> +
> +These devices are found in the PTX series of Juniper routers.
> +
> +Required properties:
> +- compatible : must be "jnx,ngpmb-nvram"

Compatible with mmio-sram?

> +
> +Optional properties:
> +- reg : memory address for the RAM, 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.

sram or nvmem style partitioning is probably more appropriate.

> +
> +Example:
> +
> +ngpmb_nvram {
> +	compatible = "jnx,ngpmb-nvram";
> +};
> -- 
> 1.9.1
>