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Date:   Tue, 11 Dec 2018 16:06:37 -0600
From:   Rob Herring <robh@kernel.org>
To:     Roger Quadros <rogerq@ti.com>
Cc:     ohad@wizery.com, bjorn.andersson@linaro.org, tony@atomide.com,
        bcousson@baylibre.com, ssantosh@kernel.org, s-anna@ti.com,
        nsekhar@ti.com, t-kristo@ti.com, nsaulnier@ti.com, jreeder@ti.com,
        m-karicheri2@ti.com, woods.technical@gmail.com,
        linux-omap@vger.kernel.org, linux-remoteproc@vger.kernel.org,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH 12/16] dt-bindings: remoteproc: ti-pruss: Document
 application node bindings
Message-ID: <20181211220637.GA32460@bogus>
References: <1543218769-5507-1-git-send-email-rogerq@ti.com>
 <1543218769-5507-13-git-send-email-rogerq@ti.com>
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On Mon, Nov 26, 2018 at 09:52:45AM +0200, Roger Quadros wrote:
> From: Tero Kristo <t-kristo@ti.com>
> 
> Add documentation for the Texas Instruments PRU application nodes.
> These are used to configure specific user applications for PRU instances.
> 
> Signed-off-by: Tero Kristo <t-kristo@ti.com>
> [s-anna@ti.com: some binding updates]
> Signed-off-by: Suman Anna <s-anna@ti.com>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---
>  .../devicetree/bindings/soc/ti/ti,pruss.txt        | 43 ++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/soc/ti/ti,pruss.txt b/Documentation/devicetree/bindings/soc/ti/ti,pruss.txt
> index 3e5f32f..94c91ee 100644
> --- a/Documentation/devicetree/bindings/soc/ti/ti,pruss.txt
> +++ b/Documentation/devicetree/bindings/soc/ti/ti,pruss.txt
> @@ -210,6 +210,38 @@ used in TI Davinci SoCs. Please refer to the corresponding binding document,
>  Documentation/devicetree/bindings/net/davinci-mdio.txt for details.
>  
>  
> +Application/User Nodes
> +=======================
> +A PRU application/user node typically uses one or more PRU device nodes to
> +implement a PRU application/functionality. Each application/client node would
> +need a reference to at least a PRU node, and optionally pass some configuration
> +parameters.
> +
> +Required Properties:
> +--------------------
> +- prus                 : phandles to the PRU nodes used
> +
> +Optional Properties:
> +--------------------
> +- firmware-name        : firmwares for the PRU cores, the default firmware
> +                         for the core from the PRU node will be used if not
> +                         provided. The firmware names should correspond to
> +                         the PRU cores listed in the 'prus' property
> +- ti,pruss-gp-mux-sel  : array of values for the GP_MUX_SEL under PRUSS_GPCFG
> +                         register for a PRU. This selects the internal muxing
> +                         scheme for the PRU instance. If not provided, the
> +                         default out-of-reset value (0) for the PRU core is
> +                         used. Values should correspond to the PRU cores listed
> +                         in the 'prus' property
> +- ti,pru-interrupt-map : PRU interrupt mappings, containing an array of entries
> +                         with each entry consisting of 4 cell-values. First one
> +                         is an index towards the "prus" property to identify the
> +                         PRU core for the interrupt map, second is the PRU
> +                         System Event id, third is the PRU interrupt channel id
> +                         and fourth is the PRU host interrupt id. If provided,
> +                         this map will supercede any other configuration
> +                         provided through firmware

Can't you use 'interrupt-map' or use more cells for the PRU intc cells. 
Or use interrupts-extended if you need more than 1 parent.

> +
>  Example:
>  ========
>  1.	/* AM33xx PRU-ICSS */
> @@ -397,3 +429,14 @@ Example:
>  			...
>  		};
>  	};
> +
> +3:	/* PRU application node example */
> +	app_node: app_node {
> +		prus = <&pru1_0>, <&pru1_1>;
> +		firmware-name = "pruss-app-fw", "pruss-app-fw-2";
> +		ti,pruss-gp-mux-sel = <2>, <1>;
> +		/* setup interrupts for prus:
> +		   prus[0] => pru1_0: ev=16, chnl=2, host-irq=7,
> +		   prus[1] => pru1_1: ev=19, chnl=1, host-irq=3 */
> +		ti,pru-interrupt-map = <0 16 2 7 >, <1 19 1 3>;
> +	}
> -- 
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>