linux-kernel - Re: [PATCH v3 3/4] Documentation: dt: add bindings for TI Wakeup M3 processor

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Message-ID: <20150511172858.GD15563@atomide.com>
Date:	Mon, 11 May 2015 10:28:58 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Dave Gerlach <d-gerlach@...com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	Ohad Ben-Cohen <ohad@...ery.com>, Suman Anna <s-anna@...com>,
	Kevin Hilman <khilman@...aro.org>
Subject: Re: [PATCH v3 3/4] Documentation: dt: add bindings for TI Wakeup M3
 processor

Hi,

* Dave Gerlach <d-gerlach@...com> [150401 12:38]:
> Add the device tree bindings document for the TI Wakeup M3 remote
> processor devices on AM33xx and AM43xx SoCs. These devices are used
> to offload low-level power management functionality, and are handled
> by the wkup_m3 remoteproc driver.
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> Signed-off-by: Dave Gerlach <d-gerlach@...com>

This binding looks OK to me now, thanks for updating it:

Acked-by: Tony Lindgren <tony@...mide.com>

> ---
>  .../bindings/remoteproc/wkup_m3_rproc.txt          | 52 ++++++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/remoteproc/wkup_m3_rproc.txt
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/wkup_m3_rproc.txt b/Documentation/devicetree/bindings/remoteproc/wkup_m3_rproc.txt
> new file mode 100644
> index 0000000..3a70073
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/wkup_m3_rproc.txt
> @@ -0,0 +1,52 @@
> +TI Wakeup M3 Remoteproc Driver
> +==============================
> +
> +The TI AM33xx and AM43xx family of devices use a small Cortex M3 co-processor
> +(commonly referred to as Wakeup M3 or CM3) to help with various low power tasks
> +that cannot be controlled from the MPU. This CM3 processor requires a firmware
> +binary to accomplish this. The wkup_m3 remoteproc driver handles the loading of
> +the firmware and booting of the CM3.
> +
> +Wkup M3 Device Node:
> +====================
> +A wkup_m3 device node is used to represent the Wakeup M3 processor instance
> +within the SoC. It is added as a child node of the parent interconnect bus
> +(l4_wkup) through which it is accessible to the MPU.
> +
> +Required properties:
> +--------------------
> +- compatible:		Should be one of,
> +				"ti,am3352-wkup-m3" for AM33xx SoCs
> +				"ti,am4372-wkup-m3" for AM43xx SoCs
> +- reg:			Should contain the address ranges for the two internal
> +			memory regions, UMEM and DMEM. The parent node should
> +			provide an appropriate ranges property for properly
> +			translating these into bus addresses.
> +- reg-names:		Contains the corresponding names for the two memory
> +			regions. These should be named "umem" & "dmem".
> +- ti,hwmods:		Name of the hwmod associated with the wkupm3 device.
> +- ti,pm-firmware:	Name of firmware file to be used for loading and
> +			booting the wkup_m3 remote processor.
> +
> +Example:
> +--------
> +/* AM33xx */
> +ocp {
> +	 l4_wkup: l4_wkup@...00000 {
> +		compatible = "am335-l4-wkup", "simple-bus";
> +		ranges = <0 0x44c00000 0x400000>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +
> +		wkup_m3: wkup_m3@...000 {
> +			compatible = "ti,am3352-wkup-m3";
> +			reg = <0x100000 0x4000>,
> +			      <0x180000 0x2000>;
> +			reg-names = "umem", "dmem";
> +			ti,hwmods = "wkup_m3";
> +			ti,pm-firmware = "am335x-pm-firmware.elf";
> +		};
> +	};
> +
> +	...
> +};
> -- 
> 2.3.0
> 
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