Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759918AbcJRNiX (ORCPT ); Tue, 18 Oct 2016 09:38:23 -0400 Received: from mail-oi0-f67.google.com ([209.85.218.67]:34326 "EHLO mail-oi0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759955AbcJRNiS (ORCPT ); Tue, 18 Oct 2016 09:38:18 -0400 Date: Tue, 18 Oct 2016 08:38:16 -0500 From: Rob Herring To: Markus Mayer Cc: Viresh Kumar , "Rafael J . Wysocki" , Mark Rutland , Broadcom Kernel List , Device Tree List , Power Management List , Linux Kernel Mailing List Subject: Re: [PATCH v4 1/3] dt: cpufreq: brcm: New binding document for brcmstb-avs-cpufreq Message-ID: <20161018133816.hcrvy52a67ig4oco@rob-hp-laptop> References: <1476310376-32699-1-git-send-email-mmayer@broadcom.com> <1476310376-32699-2-git-send-email-mmayer@broadcom.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1476310376-32699-2-git-send-email-mmayer@broadcom.com> User-Agent: Mutt/1.6.2-neo (2016-08-21) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3876 Lines: 109 On Wed, Oct 12, 2016 at 03:12:54PM -0700, Markus Mayer wrote: > Add the binding document for the new brcmstb-avs-cpufreq driver. > > Signed-off-by: Markus Mayer > Acked-by: Viresh Kumar > --- > .../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 Bindings describe h/w, not drivers or Linux subsystems. > +======================================== > + > +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 This does not match the example. Need to clarify valid combinations and ordering. > +- 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 ditto. > +- 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>; > + }; I'm wondering if this would be better described as just 1 node for the AVS cpu? Are there any other functions or resources tied to the cpu beyond your current usage? Rob