[RESEND PATCH v7 2/5] dt-bindings: ti: dpll: add spread spectrum support
From: Dario Binacchi <hidden>
Date: 2021-06-06 20:23:30
Also in:
linux-devicetree, linux-omap, lkml
Subsystem:
common clk framework, open firmware and flattened device tree bindings, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
DT bindings for enabling and adjusting spread spectrum clocking have been added. Signed-off-by: Dario Binacchi <redacted> Reviewed-by: Rob Herring <robh@kernel.org> --- (no changes since v4) Changes in v4: - Add Rob Herring review tag. Changes in v3: - Add '-hz' suffix to "ti,ssc-modfreq" binding. .../devicetree/bindings/clock/ti/dpll.txt | 20 +++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/Documentation/devicetree/bindings/clock/ti/dpll.txt b/Documentation/devicetree/bindings/clock/ti/dpll.txt
index df57009ff8e7..37a7cb6ad07d 100644
--- a/Documentation/devicetree/bindings/clock/ti/dpll.txt
+++ b/Documentation/devicetree/bindings/clock/ti/dpll.txt@@ -42,6 +42,11 @@ Required properties: "idlest" - contains the idle status register base address "mult-div1" - contains the multiplier / divider register base address "autoidle" - contains the autoidle register base address (optional) + "ssc-deltam" - DPLL supports spread spectrum clocking (SSC), contains + the frequency spreading register base address (optional) + "ssc-modfreq" - DPLL supports spread spectrum clocking (SSC), contains + the modulation frequency register base address + (optional) ti,am3-* dpll types do not have autoidle register ti,omap2-* dpll type does not support idlest / autoidle registers
@@ -51,6 +56,14 @@ Optional properties: - ti,low-power-stop : DPLL supports low power stop mode, gating output - ti,low-power-bypass : DPLL output matches rate of parent bypass clock - ti,lock : DPLL locks in programmed rate + - ti,min-div : the minimum divisor to start from to round the DPLL + target rate + - ti,ssc-deltam : DPLL supports spread spectrum clocking, frequency + spreading in permille (10th of a percent) + - ti,ssc-modfreq-hz : DPLL supports spread spectrum clocking, spread + spectrum modulation frequency + - ti,ssc-downspread : DPLL supports spread spectrum clocking, boolean + to enable the downspread feature Examples: dpll_core_ck: dpll_core_ck@44e00490 {
@@ -83,3 +96,10 @@ Examples: clocks = <&sys_ck>, <&sys_ck>; reg = <0x0500>, <0x0540>; }; + + dpll_disp_ck: dpll_disp_ck { + #clock-cells = <0>; + compatible = "ti,am3-dpll-no-gate-clock"; + clocks = <&sys_clkin_ck>, <&sys_clkin_ck>; + reg = <0x0498>, <0x0448>, <0x0454>, <0x044c>, <0x0450>; + };
--
2.17.1