linux-kernel - [PATCH v5 1/3] dt: cpufreq: brcm: New binding document for brcmstb-avs-cpufreq

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Message-Id: <20161027210536.98988-2-code@mmayer.net>
Date:   Thu, 27 Oct 2016 14:05:34 -0700
From:   Markus Mayer <code@...yer.net>
To:     Rob Herring <robh+dt@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>
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 v5 1/3] dt: cpufreq: brcm: New binding document for brcmstb-avs-cpufreq

From: Markus Mayer <mmayer@...adcom.com>

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     | 78 ++++++++++++++++++++++
 MAINTAINERS                                        |  7 ++
 2 files changed, 85 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..af23857
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt
@@ -0,0 +1,78 @@
+Broadcom AVS mail box and interrupt register 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: must include: brcm,avs-cpu-data-mem and
+              should include: one of 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: must include: brcm,avs-cpu-l2-intr and
+              should include: one of 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 1cd38a7..9379aca 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2738,6 +2738,13 @@ 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