[PATCH v5 1/2] dt-bindings: brcm: clocks: add binding for brcmstb-cpu-clk-div
From: robh@kernel.org (Rob Herring)
Date: 2017-01-21 20:47:45
Also in:
linux-clk, linux-devicetree, linux-pm, lkml
On Wed, Jan 18, 2017 at 04:29:32PM -0800, Markus Mayer wrote:
quoted hunk ↗ jump to hunk
From: Markus Mayer <mmayer@broadcom.com> Add binding document for brcm,brcmstb-cpu-clk-div. Signed-off-by: Markus Mayer <mmayer@broadcom.com> --- .../bindings/clock/brcm,brcmstb-cpu-clk-div.txt | 27 ++++++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 28 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/brcm,brcmstb-cpu-clk-div.txtdiff --git a/Documentation/devicetree/bindings/clock/brcm,brcmstb-cpu-clk-div.txt b/Documentation/devicetree/bindings/clock/brcm,brcmstb-cpu-clk-div.txt new file mode 100644 index 0000000..c4acb53 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/brcm,brcmstb-cpu-clk-div.txt@@ -0,0 +1,27 @@ +The CPU divider node serves as the sole clock for the CPU complex. It supports +power-of-2 clock division, with a divider of "1" as the default highest-speed +setting. + +Required properties: +- compatible: shall be "brcm,brcmstb-cpu-clk-div" +- reg: address and width of the divider configuration register +- #clock-cells: shall be set to 0 +- clocks: phandle of clock provider which provides the source clock + (this would typically be a "fixed-clock" type PLL) +- div-table: list of (raw_value,divider) ordered pairs that correspond to the + allowed clock divider settings
Why do you need 2 values? Can't you use the index or calculate the register value from the divider value?
+- div-shift-width: least-significant bit position and width of divider value
+
+Optional properties:
+- clock-names: the clock may be named
+
+Example:
+ cpuclkdiv: cpu-clk-div at f03e257c {clock-controller at ...
quoted hunk ↗ jump to hunk
+ compatible = "brcm,brcmstb-cpu-clk-div"; + reg = <0xf03e257c 0x4>; + div-table = <0x00 1>; + div-shift-width = <0 5>; + #clock-cells = <0>; + clocks = <&cpupll>; + clock-names = "cpupll"; + };diff --git a/MAINTAINERS b/MAINTAINERS index cfff2c9..690761d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS@@ -2786,6 +2786,7 @@ M: bcm-kernel-feedback-list at broadcom.com L: linux-pm at vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/cpufreq/brcm,stb-avs-cpu-freq.txt +F: Documentation/devicetree/bindings/clock/brcm,brcmstb-cpu-clk-div.txt F: drivers/cpufreq/brcmstb* BROADCOM SPECIFIC AMBA DRIVER (BCMA)-- 2.7.4