Re: [PATCH 1/2] dt: bindings: add new dt entry to indentify external FEM

[Rob Herring <robh@kernel.org>]

On Thu, Oct 04, 2018 at 05:12:43PM +0530, Bhagavathi Perumal S wrote:
> This adds new dt entry ext-fem-name, it is used by ath10k driver
> to select correct timing parameters and configure it in target wifi hardware.
> The Front End Module(FEM) normally includes tx power amplifier(PA) and
> rx low noise amplifier(LNA). The default timing parameters like tx end to
> PA off timing values were fine tuned for internal FEM used in reference
> design. And these timing values can not be same if ODM modifies hardware
> design with different external FEM. This DT entry helps to choose correct
> timing values in driver if different external FEM hardware used.

'dt-bindings: net: ath10k: ...' for the subject please.

> 
> Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
> ---
>  .../bindings/net/wireless/qcom,ath10k.txt          | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
> index 7fd4e8c..fbaf309 100644
> --- a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
> +++ b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
> @@ -56,6 +56,7 @@ Optional properties:
>  				     the length can vary between hw versions.
>  - <supply-name>-supply: handle to the regulator device tree node
>  			   optional "supply-name" is "vdd-0.8-cx-mx".
> +- ext-fem-name: name of external front end module used.

What are valid names? What if the OS doesn't recognize the name? Perhaps 
this should be a compatible string for the particular module instead? 
Then it could cover any differences, not just the FEM.

>  
>  Example (to supply the calibration data alone):
>  
> @@ -150,3 +151,24 @@ wifi@18000000 {
>  			   <0 141 0 /* CE11 */ >;
>  		vdd-0.8-cx-mx-supply = <&pm8998_l5>;
>  };
> +
> +Example (to supply the external front end module name):
> +
> +In this example, the front end module is defined as a property of the ath10k
> +device node.

Really need a whole new example for 1 property?

> +
> +pci {
> +	pcie@0 {
> +		reg = <0 0 0 0 0>;
> +		#interrupt-cells = <1>;
> +		#size-cells = <2>;
> +		#address-cells = <3>;
> +		device_type = "pci";
> +
> +		ath10k@0,0 {

wifi@0,0

> +			reg = <0 0 0 0 0>;
> +			device_type = "pci";
> +			ext-fem-name = "microsemi-lx5586";
> +		};
> +	};
> +};
> -- 
> 1.9.1
>