linux-kernel - Re: [PATCH v2 4/5] arm64: dts: add description for solidrun am642 som and evaluation board

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Message-ID: <0b03af70-7dc4-4a4f-b9dc-218ef365c237@linaro.org>
Date: Mon, 15 Jan 2024 08:29:06 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Josua Mayer <josua@...id-run.com>, Nishanth Menon <nm@...com>,
 Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Alessandro Zummo <a.zummo@...ertech.it>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: Yazan Shhady <yazan.shhady@...id-run.com>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>
Subject: Re: [PATCH v2 4/5] arm64: dts: add description for solidrun am642 som
 and evaluation board

On 14/01/2024 15:16, Josua Mayer wrote:
> Am 12.01.24 um 18:22 schrieb Krzysztof Kozlowski:
> 
>>> +	/* PRU Ethernet Controller */
>>> +	icssg1_eth: icssg1-eth {
>> Node names should be generic.
> This name intentionally includes the name of the ip block within am64 soc providing software-defined ethernet controller through coprocessors TI call "pru".

Why? This intentionally should not include specific name.

Also, wrap your emails at proper length so they will be manageable...

>> See also an explanation and list of
>> examples (not exhaustive) in DT specification:
>> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
>>
>>
>>> +		compatible = "ti,am642-icssg-prueth";
>>> +		pinctrl-names = "default";
>>> +		pinctrl-0 = <&pru_rgmii1_pins_default>, <&pru_rgmii2_pins_default>;
>>> +
>>> +		sram = <&oc_sram>;
>>> +		ti,prus = <&pru1_0>, <&rtu1_0>, <&tx_pru1_0>, <&pru1_1>, <&rtu1_1>, <&tx_pru1_1>;
>>> +		firmware-name = "ti-pruss/am65x-sr2-pru0-prueth-fw.elf",
>>> +				"ti-pruss/am65x-sr2-rtu0-prueth-fw.elf",
>>> +				"ti-pruss/am65x-sr2-txpru0-prueth-fw.elf",
>>> +				"ti-pruss/am65x-sr2-pru1-prueth-fw.elf",
>>> +				"ti-pruss/am65x-sr2-rtu1-prueth-fw.elf",
>>> +				"ti-pruss/am65x-sr2-txpru1-prueth-fw.elf";
>>> +
>>> +		ti,pruss-gp-mux-sel = <2>,	/* MII mode */
>>> +				      <2>,
>>> +				      <2>,
>>> +				      <2>,	/* MII mode */
>>> +				      <2>,
>>> +				      <2>;
>>> +
>>> +		ti,mii-g-rt = <&icssg1_mii_g_rt>;
>>> +		ti,mii-rt = <&icssg1_mii_rt>;
>>> +		ti,iep = <&icssg1_iep0>, <&icssg1_iep1>;
>>> +
>>> +		interrupt-parent = <&icssg1_intc>;
>>> +		interrupts = <24 0 2>, <25 1 3>;
>> None of these are typical interrupt constants/flags?
>>
>>> +		interrupt-names = "tx_ts0", "tx_ts1";
>>> +
>>> +		dmas = <&main_pktdma 0xc200 15>, /* egress slice 0 */
>>> +		       <&main_pktdma 0xc201 15>, /* egress slice 0 */
>>> +		       <&main_pktdma 0xc202 15>, /* egress slice 0 */
>>> +		       <&main_pktdma 0xc203 15>, /* egress slice 0 */
>>> +		       <&main_pktdma 0xc204 15>, /* egress slice 1 */
>>> +		       <&main_pktdma 0xc205 15>, /* egress slice 1 */
>>> +		       <&main_pktdma 0xc206 15>, /* egress slice 1 */
>>> +		       <&main_pktdma 0xc207 15>, /* egress slice 1 */
>>> +		       <&main_pktdma 0x4200 15>, /* ingress slice 0 */
>>> +		       <&main_pktdma 0x4201 15>, /* ingress slice 1 */
>>> +		       <&main_pktdma 0x4202 0>, /* mgmnt rsp slice 0 */
>>> +		       <&main_pktdma 0x4203 0>; /* mgmnt rsp slice 1 */
>>> +		dma-names = "tx0-0", "tx0-1", "tx0-2", "tx0-3",
>>> +			    "tx1-0", "tx1-1", "tx1-2", "tx1-3",
>>> +			    "rx0", "rx1";
>>> +
>>> +		status = "okay";
>> Drop. Didn't you get such comments before?
> 
> Yes, but again I can point to an in-tree example of the same structure.
> I see no reason for describing the same thing differently in different places.

So if there is a bug, you are going to duplicate it.

Please provide real argument why this is needed, not "I saw it
somewhere", or drop it. Otherwise it's a NAK from me.

> 
> Please see arch/arm64/boot/dts/ti/k3-am654-idk.dtso
> There are only small differences for this feature between am65 and am64.
> It's inclusion in the tree was very recent, clearly it was good enough right?
> See also my cover letter dtbs_check remark on dmas property.

How does dmas matter? What are you talking about?



Best regards,
Krzysztof