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Date: Wed, 12 Oct 2016 15:12:54 -0700 From: Markus Mayer <mmayer@...adcom.com> To: Viresh Kumar <viresh.kumar@...aro.org>, "Rafael J . Wysocki" <rjw@...ysocki.net>, Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com> Cc: Broadcom Kernel List <bcm-kernel-feedback-list@...adcom.com>, Device Tree List <devicetree@...r.kernel.org>, Power Management List <linux-pm@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Markus Mayer <mmayer@...adcom.com> Subject: [PATCH v4 1/3] dt: cpufreq: brcm: New binding document for brcmstb-avs-cpufreq Add the binding document for the new brcmstb-avs-cpufreq driver. Signed-off-by: Markus Mayer <mmayer@...adcom.com> Acked-by: Viresh Kumar <viresh.kumar@...aro.org> --- .../bindings/cpufreq/brcm,stb-avs-cpu-freq.txt | 76 ++++++++++++++++++++++ MAINTAINERS | 7 ++ 2 files changed, 83 insertions(+) create mode 100644 Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt diff --git a/Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt b/Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt new file mode 100644 index 0000000..23a2c3d --- /dev/null +++ b/Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt @@ -0,0 +1,76 @@ +Broadcom STB AVS CPUfreq driver bindings +======================================== + +A total of three DT nodes are required. One node (brcm,avs-cpu-data-mem) +references the mailbox register used to communicate with the AVS CPU[1]. The +second node (brcm,avs-cpu-l2-intr) is required to trigger an interrupt on +the AVS CPU. The interrupt tells the AVS CPU that it needs to process a +command sent to it by a driver. Interrupting the AVS CPU is mandatory for +commands to be processed. + +The interface also requires a reference to the AVS host interrupt controller, +so a driver can react to interrupts generated by the AVS CPU whenever a command +has been processed. See [2] for more information on the brcm,l2-intc node. + +[1] The AVS CPU is an independent co-processor that runs proprietary +firmware. On some SoCs, this firmware supports DFS and DVFS in addition to +Adaptive Voltage Scaling. + +[2] Documentation/devicetree/bindings/interrupt-controller/brcm,l2-intc.txt + + +Node brcm,avs-cpu-data-mem +-------------------------- + +Required properties: +- compatible: Sould be one of: brcm,avs-cpu-data-mem, + brcm,bcm7271-avs-cpu-data-mem or brcm,bcm7268-avs-cpu-data-mem +- reg: Specifies base physical address and size of the registers. +- interrupts: The interrupt that the AVS CPU will use to interrupt the host + when a command completed. +- interrupt-parent: The interrupt controller the above interrupt is routed + through. +- interrupt-names: The name of the interrupt used to interrupt the host. + +Optional properties: +- None + +Node brcm,avs-cpu-l2-intr +------------------------- + +Required properties: +- compatible: Sould be one of: brcm,avs-cpu-l2-intr, + brcm,bcm7271-avs-cpu-l2-intr or brcm,bcm7268-avs-cpu-l2-intr +- reg: Specifies base physical address and size of the registers. + +Optional properties: +- None + + +Example +======= + + avs_host_l2_intc: interrupt-controller@...d1200 { + #interrupt-cells = <1>; + compatible = "brcm,l2-intc"; + interrupt-parent = <&intc>; + reg = <0xf04d1200 0x48>; + interrupt-controller; + interrupts = <0x0 0x19 0x0>; + interrupt-names = "avs"; + }; + + avs-cpu-data-mem@...c4000 { + compatible = "brcm,bcm7271-avs-cpu-data-mem", + "brcm,avs-cpu-data-mem"; + reg = <0xf04c4000 0x60>; + interrupts = <0x1a>; + interrupt-parent = <&avs_host_l2_intc>; + interrupt-names = "sw_intr"; + }; + + avs-cpu-l2-intr@...d1100 { + compatible = "brcm,bcm7271-avs-cpu-l2-intr", + "brcm,avs-cpu-l2-intr"; + reg = <0xf04d1100 0x10>; + }; diff --git a/MAINTAINERS b/MAINTAINERS index f593300..75accd5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2701,6 +2701,13 @@ L: bcm-kernel-feedback-list@...adcom.com S: Maintained F: drivers/mtd/nand/brcmnand/ +BROADCOM STB AVS CPUFREQ DRIVER +M: Markus Mayer <mmayer@...adcom.com> +M: bcm-kernel-feedback-list@...adcom.com +L: linux-pm@...r.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt + BROADCOM SPECIFIC AMBA DRIVER (BCMA) M: Rafał Miłecki <zajec5@...il.com> L: linux-wireless@...r.kernel.org -- 2.7.4
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