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Message-ID: <20170531191231.5qt2lfv73p572gmd@rob-hp-laptop>
Date: Wed, 31 May 2017 14:12:31 -0500
From: Rob Herring <robh@...nel.org>
To: Suman Anna <s-anna@...com>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>,
Ohad Ben-Cohen <ohad@...ery.com>,
Santosh Shilimkar <ssantosh@...nel.org>,
Mark Rutland <mark.rutland@....com>,
linux-remoteproc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, "Andrew F. Davis" <afd@...com>,
Sam Nelson <sam.nelson@...com>
Subject: Re: [PATCH 1/3] Documentation: DT: add Keystone DSP remoteproc
binding
On Fri, May 26, 2017 at 11:53:15AM -0500, Suman Anna wrote:
> Add the device tree bindings document for the Texas Instrument's
> Keystone 2 DSP remoteproc devices.
>
> Signed-off-by: Suman Anna <s-anna@...com>
> Signed-off-by: Sam Nelson <sam.nelson@...com>
> ---
> .../bindings/remoteproc/ti,keystone-rproc.txt | 132 +++++++++++++++++++++
> 1 file changed, 132 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,keystone-rproc.txt
>
> diff --git a/Documentation/devicetree/bindings/remoteproc/ti,keystone-rproc.txt b/Documentation/devicetree/bindings/remoteproc/ti,keystone-rproc.txt
> new file mode 100644
> index 000000000000..f1ba88edd00d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/ti,keystone-rproc.txt
> @@ -0,0 +1,132 @@
> +TI Keystone DSP devices
> +=======================
> +
> +Binding status: Unstable - Subject to changes for using multiple memory regions
I don't really see what would be unstable here. memory-region is easily
extended to multiple entries.
> +
> +The TI Keystone 2 family of SoCs usually have one or more (upto 8) TI DSP Core
> +sub-systems that are used to offload some of the processor-intensive tasks or
> +algorithms, for achieving various system level goals.
> +
> +These processor sub-systems usually contain additional sub-modules like L1
> +and/or L2 caches/SRAMs, an Interrupt Controller, an external memory controller,
> +a dedicated local power/sleep controller etc. The DSP processor core in
> +Keystone 2 SoCs is usually a TMS320C66x CorePac processor.
> +
> +DSP Device Node:
> +================
> +Each DSP Core sub-system is represented as a single DT node. Each node has a
> +number of required or optional properties that enable the OS running on the
> +host processor (ARM CorePac) to perform the device management of the remote
> +processor and to communicate with the remote processor.
> +
> +Required properties:
> +--------------------
> +The following are the mandatory properties:
> +
> +- compatible: Should be one of the following,
> + "ti,k2hk-dsp" for DSPs on Keystone 2 66AK2H/K SoCs
> + "ti,k2l-dsp" for DSPs on Keystone 2 66AK2L SoCs
> + "ti,k2e-dsp" for DSPs on Keystone 2 66AK2E SoCs
> +
> +- reg: Should contain an entry for each value in 'reg-names'.
> + Each entry should have the memory region's start address
> + and the size of the region, the representation matching
> + the parent node's '#address-cells' and '#size-cells' values.
> +
> +- reg-names: Should contain strings with the following names, each
> + representing a specific internal memory region, and
> + should be defined in this order,
> + "l2sram", "l1pram", "l1dram"
> +
> +- label: Should contain a string identifying the DSP instance
> + within the SoC. Should be the string "dsp" followed by
> + the instance number. Eg: "dsp0", "dsp1",..."dsp7" etc
Why does a user need to know or care?
> +
> +- clocks: Should contain the device's input clock, and should be
> + defined as per the bindings in,
> + Documentation/devicetree/bindings/clock/keystone-gate.txt
> +
> +- ti,syscon-dev: Should be a pair of the phandle to the Keystone Device
> + State Control node, and the register offset of the DSP
> + boot address register within that node's address space.
> +
> +- resets: Should contain the phandle to the reset controller node
> + managing the resets for this device, and a reset
> + specifier. Please refer to the following reset bindings
> + for the reset argument specifier as per SoC,
> + Documentation/devicetree/bindings/reset/ti-syscon-reset.txt
> + for 66AK2HK/66AK2L/66AK2E SoCs
> +
> +- interrupt-parent: Should contain a phandle to the Keystone 2 IRQ controller
> + IP node that is used by the ARM CorePac processor to
> + receive interrupts from the DSP remote processors. See
> + Documentation/devicetree/bindings/interrupt-controller/ti,keystone-irq.txt
> + for details.
> +
> +- interrupts: Should contain an entry for each value in 'interrupt-names'.
> + Each entry should have the interrupt source number used by
> + the remote processor to the host processor. The values should
> + follow the interrupt-specifier format as dictated by the
> + 'interrupt-parent' node. The purpose of each is as per the
> + description in the 'interrupt-names' property.
> +
> +- interrupt-names: Should contain strings with the following names, each
> + representing a specific interrupt,
> + "vring" - interrupt for virtio based IPC
> + "exception" - interrupt for exception notification
> +
> +- kick-gpio: Should specify the gpio device needed for the virtio IPC
-gpios
> + stack. This will be used to interrupt the remote processor.
> + The gpio device to be used is as per the bindings in,
> + Documentation/devicetree/bindings/gpio/gpio-dsp-keystone.txt
> +
> +Optional properties:
> +--------------------
> +
> +- memory-region: phandle to the reserved memory node to be associated
> + with the remoteproc device. The reserved memory node
> + can be a CMA memory node, and should be defined as
> + per the bindings in
> + Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
> +
> +
> +Example:
> +--------
> +
> + /* 66AK2H/K DSP node in SoC DTS file */
> + soc {
> + dsp0: dsp@...00000 {
> + compatible = "ti,k2hk-dsp";
> + reg = <0x10800000 0x00100000>,
> + <0x10e00000 0x00008000>,
> + <0x10f00000 0x00008000>;
> + reg-names = "l2sram", "l1pram", "l1dram";
> + label = "dsp0";
> + clocks = <&clkgem0>;
> + ti,syscon-dev = <&devctrl 0x40>;
> + resets = <&pscrst 0>;
> + interrupt-parent = <&kirq0>;
> + interrupts = <0 8>;
> + interrupt-names = "vring", "exception";
> + kick-gpio = <&dspgpio0 27 0>;
> + };
> +
> + };
> +
> + /* K2HK EVM Board file */
> + reserved-memory {
> + #address-cells = <2>;
> + #size-cells = <2>;
> + ranges;
> +
> + dsp_common_cma_pool: dsp_common_cma_pool@...800000 {
> + compatible = "shared-dma-pool";
> + reg = <0x00000008 0x1f800000 0x00000000 0x800000>;
> + reusable;
> + status = "okay";
> + };
> + };
> +
> + &dsp0 {
> + memory-region = <&dsp_common_cma_pool>;
> + };
> --
> 2.12.0
>
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