linux-kernel - Re: [PATCH v2 2/2] devicetree: bindings: Add the binding doc for xilinx APM

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Date:   Thu, 19 Dec 2019 12:43:18 -0600
From:   Rob Herring <robh@...nel.org>
To:     shubhrajyoti.datta@...il.com
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        michal.simek@...inx.com, gregkh@...uxfoundation.org,
        Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
Subject: Re: [PATCH v2 2/2] devicetree: bindings: Add the binding doc for
 xilinx APM

On Mon, Dec 09, 2019 at 07:53:25PM +0530, shubhrajyoti.datta@...il.com wrote:
> From: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
> 
> Add the devicetree binding for xilinx APM.
> 
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
> ---
> v2:
> patch added
> 
>  .../devicetree/bindings/perf/xilinx_apm.txt        | 44 ++++++++++++++++++++++
>  1 file changed, 44 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/perf/xilinx_apm.txt

As Michal said, DT schema please.
> 
> diff --git a/Documentation/devicetree/bindings/perf/xilinx_apm.txt b/Documentation/devicetree/bindings/perf/xilinx_apm.txt
> new file mode 100644
> index 0000000..a11c82e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/perf/xilinx_apm.txt
> @@ -0,0 +1,44 @@
> +* Xilinx AXI Performance monitor IP
> +
> +Required properties:
> +- compatible: "xlnx,axi-perf-monitor"

Version?

> +- interrupts: Should contain APM interrupts.
> +- interrupt-parent: Must be core interrupt controller.

Drop this.

> +- reg: Should contain APM registers location and length.
> +- xlnx,enable-profile: Enables the profile mode.
> +- xlnx,enable-trace: Enables trace mode.
> +- xlnx,num-monitor-slots: Maximum number of slots in APM.
> +- xlnx,enable-event-count: Enable event count.
> +- xlnx,enable-event-log: Enable event logging.
> +- xlnx,have-sampled-metric-cnt:Sampled metric counters enabled in APM.
> +- xlnx,num-of-counters: Number of counters in APM
> +- xlnx,metric-count-width: Metric Counter width (32/64)
> +- xlnx,metrics-sample-count-width: Sampled metric counter width
> +- xlnx,global-count-width: Global Clock counter width

All these synthesis time config and not discoverable?

Tell h/w designers to add feature registers so all this is 
discoverable. </rant>

> +- clocks: Input clock specifier.
> +
> +Optional properties:
> +- xlnx,id-filter-32bit: APM is in 32-bit mode
> +
> +Example:
> +++++++++
> +
> +apm: apm@...00000 {
> +    compatible = "xlnx,axi-perf-monitor";
> +    interrupt-parent = <&axi_intc_1>;
> +    interrupts = <1 2>;
> +    reg = <0x44a00000 0x1000>;
> +    clocks = <&clkc 15>;
> +    xlnx,enable-profile = <0>;
> +    xlnx,enable-trace = <0>;
> +    xlnx,num-monitor-slots = <4>;
> +    xlnx,enable-event-count = <1>;
> +    xlnx,enable-event-log = <1>;
> +    xlnx,have-sampled-metric-cnt = <1>;
> +    xlnx,num-of-counters = <8>;
> +    xlnx,metric-count-width = <32>;
> +    xlnx,metrics-sample-count-width = <32>;
> +    xlnx,global-count-width = <32>;
> +    xlnx,metric-count-scale = <1>;
> +    xlnx,id-filter-32bit;
> +};
> -- 
> 2.1.1
>