From patchwork Fri Aug 12 23:25:29 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Markus Mayer X-Patchwork-Id: 9278119 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 9D45960231 for ; Fri, 12 Aug 2016 23:26:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8F25428AF2 for ; Fri, 12 Aug 2016 23:26:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8401728B2A; Fri, 12 Aug 2016 23:26:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6794828AF2 for ; Fri, 12 Aug 2016 23:26:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752520AbcHLX0J (ORCPT ); Fri, 12 Aug 2016 19:26:09 -0400 Received: from mail-qt0-f176.google.com ([209.85.216.176]:33930 "EHLO mail-qt0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752504AbcHLX0I (ORCPT ); Fri, 12 Aug 2016 19:26:08 -0400 Received: by mail-qt0-f176.google.com with SMTP id u25so457225qtb.1 for ; Fri, 12 Aug 2016 16:26:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=cKFv6kF3iRsJ2WKjvcWrq2B6/Pg78CbknSWtSJ2Iwdk=; b=faIWaMQEhJUir3jSKD3aqrR+F1QyqTEjQdbc5Ae8euKMyl1UUuP62Y7J2PMgHR6F9s Firr5+7XHVSxtAi/vNwtTLm1KLS4MfO3jsEgLdRJYy1bhvNXxn/MyJIQXfeSbSvQdrZF Zq7YqvtL9rBa1Mbs2GAKUFsrpTkk0bGKXsl/I= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=cKFv6kF3iRsJ2WKjvcWrq2B6/Pg78CbknSWtSJ2Iwdk=; b=LT1sfCLnCAwAHRuHiGlcgEA0K1botjs3TURvRmHYy3FnXjicqSQgLrBR8vISue9xC8 /XR7r8UarTVb/g5cTZXbIANxNI3qhqhje6n6YlHJsx+ATtGY+pNEO+NSfPDnuH6ggCpq vDmB9/FBZcLKpE1wX1DTv6RTQa/iBW855BEPJ282QMARjn+HKgJJg5gncjuUIdQYaMna 1a2We18nigh4QtUX/nbS3LZwNRiVv00EEyNU8/VyDN01nuL724dLK0l+PUUThHozweyT TmEI8yRjsO2pY/M1/rSRgS8hG7kkQ1DRve1jagjPU8oWl3jbwffS4UwglawSRUOevAMX hXPw== X-Gm-Message-State: AEkoouuA7vvgLU+A/kX53vn//Mdq9fMXDiN/9G90LeQq54mOpqvyN3jeP6wuspnkNtMzZ1kZ X-Received: by 10.237.60.44 with SMTP id t41mr20155662qte.102.1471044367417; Fri, 12 Aug 2016 16:26:07 -0700 (PDT) Received: from lbrmn-mmayer.lab.lan ([216.31.219.19]) by smtp.gmail.com with ESMTPSA id d133sm4433489qke.40.2016.08.12.16.26.04 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 12 Aug 2016 16:26:06 -0700 (PDT) From: Markus Mayer 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 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> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1471044331-2480-1-git-send-email-mmayer@broadcom.com> References: <1471044331-2480-1-git-send-email-mmayer@broadcom.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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@broadcom.com S: Maintained F: drivers/mtd/nand/brcmnand/ +BROADCOM STB CPUFREQ DRIVER +M: Markus Mayer +M: bcm-kernel-feedback-list@broadcom.com +L: linux-pm@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/cpufreq/brcm-avs-cpufreq.txt + BROADCOM SPECIFIC AMBA DRIVER (BCMA) M: Rafał Miłecki L: linux-wireless@vger.kernel.org