linux-kernel - Re: [PATCH 2/3] fpga: region: Add fpga-region property 'power-domains'

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Date:   Fri, 2 Apr 2021 10:15:38 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     Nava kishore Manne <nava.manne@...inx.com>
Cc:     mdf@...nel.org, trix@...hat.com, robh+dt@...nel.org,
        michal.simek@...inx.com, linux-fpga@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, git@...inx.com
Subject: Re: [PATCH 2/3] fpga: region: Add fpga-region property
 'power-domains'

On Fri, Apr 02, 2021 at 02:50:48PM +0530, Nava kishore Manne wrote:
> Add fpga-region property 'power-domains' to allow to handle
> the FPGA/PL power domins.
> 
> dt-bindings: fpga: Enable PM generic domain support
> 
> Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> ---
>  .../devicetree/bindings/fpga/fpga-region.txt       | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/fpga/fpga-region.txt b/Documentation/devicetree/bindings/fpga/fpga-region.txt
> index e811cf825019..969ca53bb65e 100644
> --- a/Documentation/devicetree/bindings/fpga/fpga-region.txt
> +++ b/Documentation/devicetree/bindings/fpga/fpga-region.txt
> @@ -196,6 +196,20 @@ Optional properties:
>  - config-complete-timeout-us : The maximum time in microseconds time for the
>  	FPGA to go to operating mode after the region has been programmed.
>  - child nodes : devices in the FPGA after programming.
> +- power-domains : A phandle and PM domain specifier as defined by bindings of
> +	the power controller specified by phandle.
> +Example:
> +	fpga_full: fpga-full {
> +                compatible = "fpga-region";
> +                fpga-mgr = <&zynqmp_pcap>;
> +                #address-cells = <2>;
> +                #size-cells = <2>;
> +                ranges;
> +                power-domains = <&zynqmp_firmware PL_PD>;
> +        };
> +
> +	The PL_PD power domain will be turned on before loading the bitstream
> +and turned off while removing/unloading the bitstream using overlays.

Can multiple regions share a power-domain or is this specific to full
fpga reconfiguration?

- Moritz