linux-kernel - Re: [PATCH v2 2/4] dt-bindings: ti: dpll: add spread spectrum support

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Date:   Thu, 25 Mar 2021 19:18:23 -0600
From:   Rob Herring <robh@...nel.org>
To:     Dario Binacchi <dariobin@...ero.it>
Cc:     linux-kernel@...r.kernel.org,
        Grygorii Strashko <grygorii.strashko@...com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 2/4] dt-bindings: ti: dpll: add spread spectrum support

On Thu, Mar 18, 2021 at 06:26:24PM +0100, Dario Binacchi wrote:
> DT bindings for enabling and adjusting spread spectrum clocking have
> been added.
> 
> Signed-off-by: Dario Binacchi <dariobin@...ero.it>
> ---
> 
> (no changes since v1)
> 
>  .../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..0810ae073294 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 : DPLL supports spread spectrum clocking, spread
> +			   spectrum modulation frequency in kHz

Use a standard unit suffix (-hz or -mhz).

> +	- 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
>