From mboxrd@z Thu Jan 1 00:00:00 1970 From: Markus Mayer Subject: [PATCH 1/3] dt: cpufreq: brcm: New binding document for brcm-avs-cpufreq Date: Fri, 12 Aug 2016 16:25:29 -0700 Message-ID: <1471044331-2480-2-git-send-email-mmayer@broadcom.com> References: <1471044331-2480-1-git-send-email-mmayer@broadcom.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <1471044331-2480-1-git-send-email-mmayer-dY08KVG/lbpWk0Htik3J/w@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Rob Herring , Mark Rutland , "Rafael J . Wysocki" , Viresh Kumar Cc: Broadcom Kernel List , Device Tree List , Power Management List , Linux Kernel Mailing List , Markus Mayer List-Id: devicetree@vger.kernel.org Add the binding document for the new brcm-avs-cpufreq driver. Signed-off-by: Markus Mayer --- .../bindings/cpufreq/brcm-avs-cpufreq.txt | 84 ++++++++++++++++++++++ MAINTAINERS | 7 ++ 2 files changed, 91 insertions(+) create mode 100644 Documentation/devicetree/bindings/cpufreq/brcm-avs-cpufreq.txt diff --git a/Documentation/devicetree/bindings/cpufreq/brcm-avs-cpufreq.txt b/Documentation/devicetree/bindings/cpufreq/brcm-avs-cpufreq.txt new file mode 100644 index 0000000..707ebe5 --- /dev/null +++ b/Documentation/devicetree/bindings/cpufreq/brcm-avs-cpufreq.txt @@ -0,0 +1,84 @@ +Broadcom AVS CPUfreq driver +=========================== + +This driver provides voltage and frequency scaling on Broadcom SoCs using +the AVS firmware with DVFS support. The AVS firmware is running on its own +co-processor. The driver supports both uniprocessor (UP) and symmetric +multiprocessor (SMP) systems which share clock and voltage across all CPUs. + +Actual voltage and frequency scaling is done solely by the AVS firmware. +This driver does not change frequency or voltage itself. It provides a +standard CPUfreq interface to the rest of the kernel and to userland. It +interfaces with the AVS firmware to effect the requested changes and to +report back the current system status in a way that is expected by existing +tools. + +This driver requires two DT nodes. One node (brcm,avs-cpu-data-mem) +references the mailbox register used to communicate with the AVS CPU. 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 this driver. Interrupting the AVS CPU is mandatory for +commands to be processed. + +It also requires a reference to the AVS host interrrupt controller, so the +driver can react to interrupts generated by the AVS CPU whenever a command +has been processed. See [1] for more information on the brcm,l2-intc. + +[1] 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@f04d1200 { + #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@f04c4000 { + 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@f04d1100 { + compatible = "brcm,bcm7271-avs-cpu-l2-intr", + "brcm,avs-cpu-l2-intr"; + reg = <0xf04d1100 0x10>; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 20bb1d0..228a5a8 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2689,6 +2689,13 @@ L: bcm-kernel-feedback-list-dY08KVG/lbpWk0Htik3J/w@public.gmane.org S: Maintained F: drivers/mtd/nand/brcmnand/ +BROADCOM STB CPUFREQ DRIVER +M: Markus Mayer +M: bcm-kernel-feedback-list-dY08KVG/lbpWk0Htik3J/w@public.gmane.org +L: linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org +S: Maintained +F: Documentation/devicetree/bindings/cpufreq/brcm-avs-cpufreq.txt + BROADCOM SPECIFIC AMBA DRIVER (BCMA) M: Rafał Miłecki L: linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html