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@broadcom.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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 (file)
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@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 1cd38a7..9379aca 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2738,6 +2738,13 @@ L:       bcm-kernel-feedback-list@broadcom.com
 S:     Maintained
 F:     drivers/mtd/nand/brcmnand/
 
+BROADCOM STB AVS CPUFREQ DRIVER
+M:     Markus Mayer <mmayer@broadcom.com>
+M:     bcm-kernel-feedback-list@broadcom.com
+L:     linux-pm@vger.kernel.org
+S:     Maintained
+F:     Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt
+
 BROADCOM SPECIFIC AMBA DRIVER (BCMA)
 M:     Rafał Miłecki <zajec5@gmail.com>
 L:     linux-wireless@vger.kernel.org