linux-kernel - Re: [PATCH v4] ARM: dts: add DT for lan966 SoC and 2-port board pcb8291

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Date:   Wed,  9 Feb 2022 19:46:00 +0100
From:   Michael Walle <michael@...le.cc>
To:     kavyasree.kotagiri@...rochip.com
Cc:     Manohar.Puri@...rochip.com, UNGLinuxDriver@...rochip.com,
        alexandre.belloni@...tlin.com, arnd@...db.de,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, nicolas.ferre@...rochip.com,
        olof@...om.net, robh+dt@...nel.org, soc@...nel.org,
        Michael Walle <michael@...le.cc>
Subject: Re: [PATCH v4] ARM: dts: add DT for lan966 SoC and 2-port board pcb8291

Hi,

> +	clocks {
[..]
> +
> +		nic_clk: nic_clk {

What does nic_clk stand for? If I had to guess, it
has something to do with network. But..

> +			compatible = "fixed-clock";
> +			#clock-cells = <0>;
> +			clock-frequency = <200000000>;
> +		};
> +	};
> +
> +	clks: clock-controller@...c00a8 {
> +		compatible = "microchip,lan966x-gck";
> +		#clock-cells = <1>;
> +		clocks = <&cpu_clk>, <&ddr_clk>, <&sys_clk>;
> +		clock-names = "cpu", "ddr", "sys";
> +		reg = <0xe00c00a8 0x38>;
> +	};
> +
> +	timer {
> +		compatible = "arm,armv7-timer";
> +		interrupt-parent = <&gic>;
> +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>;
> +		clock-frequency = <37500000>;
> +		arm,cpu-registers-not-fw-configured;
> +	};
> +
> +	soc {
> +		compatible = "simple-bus";
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		flx0: flexcom@...40000 {
> +			compatible = "atmel,sama5d2-flexcom";
> +			reg = <0xe0040000 0x100>;
> +			clocks = <&clks GCK_ID_FLEXCOM0>;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges = <0x0 0xe0040000 0x800>;
> +			status = "disabled";
> +		};
> +
> +		flx1: flexcom@...44000 {
> +			compatible = "atmel,sama5d2-flexcom";
> +			reg = <0xe0044000 0x100>;
> +			clocks = <&clks GCK_ID_FLEXCOM1>;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges = <0x0 0xe0044000 0x800>;
> +			status = "disabled";
> +		};
> +
> +		trng: trng@...48000 {
> +			compatible = "atmel,at91sam9g45-trng";
> +			reg = <0xe0048000 0x100>;
> +			clocks = <&nic_clk>;

.. it is used here..


> +		};
> +
> +		aes: aes@...4c000 {
> +			compatible = "atmel,at91sam9g46-aes";
> +			reg = <0xe004c000 0x100>;
> +			interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>;
> +			dmas = <&dma0 AT91_XDMAC_DT_PERID(13)>,
> +			       <&dma0 AT91_XDMAC_DT_PERID(12)>;
> +			dma-names = "rx", "tx";
> +			clocks = <&nic_clk>;

.. and here. and so on.

So, is it some kind of internal clock?

> +			interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>;
> +		};
> +
> +		watchdog: watchdog@...90000 {
> +			compatible = "snps,dw-wdt";
> +			reg = <0xe0090000 0x1000>;
> +			interrupts = <GIC_SPI 38 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&nic_clk>;

Btw. can we disable all nodes by default and enable them
in the board dts files?