linux-kernel - Re: [PATCH v3 04/14] dt-bindings: mailbox: qcom: Add clock-name optional property

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Date:   Thu, 11 Jul 2019 07:45:57 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
Cc:     sboyd@...nel.org, david.brown@...aro.org, jassisinghbrar@...il.com,
        mark.rutland@....com, mturquette@...libre.com, robh+dt@...nel.org,
        will.deacon@....com, arnd@...db.de, horms+renesas@...ge.net.au,
        heiko@...ech.de, sibis@...eaurora.org,
        enric.balletbo@...labora.com, jagan@...rulasolutions.com,
        olof@...om.net, vkoul@...nel.org, niklas.cassel@...aro.org,
        georgi.djakov@...aro.org, amit.kucheria@...aro.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, khasim.mohammed@...aro.org
Subject: Re: [PATCH v3 04/14] dt-bindings: mailbox: qcom: Add clock-name
 optional property

On Tue 25 Jun 09:47 PDT 2019, Jorge Ramirez-Ortiz wrote:

> When the APCS clock is registered (platform dependent), it retrieves
> its parent names from hardcoded values in the driver.
> 
> The following commit allows the DT node to provide such clock names to
> the platform data based clock driver therefore avoiding having to
> explicitly embed those names in the clock driver source code.
> 
> Co-developed-by: Niklas Cassel <niklas.cassel@...aro.org>
> Signed-off-by: Niklas Cassel <niklas.cassel@...aro.org>
> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
> Reviewed-by: Rob Herring <robh@...nel.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  .../mailbox/qcom,apcs-kpss-global.txt         | 24 ++++++++++++++++---
>  1 file changed, 21 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt b/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt
> index 1232fc9fc709..b69310322b09 100644
> --- a/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt
> +++ b/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.txt
> @@ -18,10 +18,11 @@ platforms.
>  	Usage: required
>  	Value type: <prop-encoded-array>
>  	Definition: must specify the base address and size of the global block
> +
>  - clocks:
> -	Usage: required if #clocks-cells property is present
> -	Value type: <phandle>
> -	Definition: phandle to the input PLL, which feeds the APCS mux/divider
> +	Usage: required if #clock-names property is present
> +	Value type: <phandle array>
> +	Definition: phandles to the two parent clocks of the clock driver.
>  
>  - #mbox-cells:
>  	Usage: required
> @@ -33,6 +34,12 @@ platforms.
>  	Value type: <u32>
>  	Definition: as described in clock.txt, must be 0
>  
> +- clock-names:
> +	Usage: required if the platform data based clock driver needs to
> +	retrieve the parent clock names from device tree.
> +	This will requires two mandatory clocks to be defined.
> +	Value type: <string-array>
> +	Definition: must be "aux" and "pll"
>  
>  = EXAMPLE
>  The following example describes the APCS HMSS found in MSM8996 and part of the
> @@ -65,3 +72,14 @@ Below is another example of the APCS binding on MSM8916 platforms:
>  		clocks = <&a53pll>;
>  		#clock-cells = <0>;
>  	};
> +
> +Below is another example of the APCS binding on QCS404 platforms:
> +
> +	apcs_glb: mailbox@...1000 {
> +		compatible = "qcom,qcs404-apcs-apps-global", "syscon";
> +		reg = <0x0b011000 0x1000>;
> +		#mbox-cells = <1>;
> +		clocks = <&gcc GCC_GPLL0_AO_OUT_MAIN>, <&apcs_hfpll>;
> +		clock-names = "aux", "pll";
> +		#clock-cells = <0>;
> +	};
> -- 
> 2.21.0
>