linux-kernel - [PATCH v6 2/5] dt-bindings: ti: dpll: add spread spectrum support

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Message-Id: <20210520191306.21711-3-dariobin@libero.it>
Date:   Thu, 20 May 2021 21:13:02 +0200
From:   Dario Binacchi <dariobin@...ero.it>
To:     linux-kernel@...r.kernel.org
Cc:     Lee Jones <lee.jones@...aro.org>,
        Benoît Cousson <bcousson@...libre.com>,
        Rob Herring <robh@...nel.org>, Tero Kristo <kristo@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Dario Binacchi <dariobin@...ero.it>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: [PATCH v6 2/5] dt-bindings: ti: dpll: add spread spectrum support

DT bindings for enabling and adjusting spread spectrum clocking have
been added.

Signed-off-by: Dario Binacchi <dariobin@...ero.it>
Reviewed-by: Rob Herring <robh@...nel.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@...00490 {
@@ -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