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

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Date: Mon, 15 Jan 2024 10:32:55 +0000
From: Josua Mayer <josua@...id-run.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 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

Am 15.01.24 um 11:21 schrieb Krzysztof Kozlowski:
> On 15/01/2024 11:05, Josua Mayer wrote:
>> Am 15.01.24 um 08:29 schrieb Krzysztof Kozlowski:
>>
>>> 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.
>> I understand. Which is why I imagined in the other reference had intentionally
>> diverged from that rule.
>>> 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?
These are the magic numbers
>>>>>
>>>>>> +		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 */
These are maybe magic numbers
>>>>>> +		dma-names = "tx0-0", "tx0-1", "tx0-2", "tx0-3",
>>>>>> +			    "tx1-0", "tx1-1", "tx1-2", "tx1-3",
>>>>>> +			    "rx0", "rx1";
two names missing here
>>>>>> +
>>>>>> +		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.
>> I was torn between making my own solution, and using recently
>> added and topical (to my submission) code as template.
>>> Please provide real argument why this is needed, not "I saw it
>>> somewhere", or drop it. Otherwise it's a NAK from me.
>> I will attempt to improve the magic numbers in this whole node,
>> and reconsider the node name. Thanks.
> What magic numbers? My comment was under one specific line. There are no
> numbers in status.
Sorry it wasn't clear, status: acked, my mistake, I made it too many times
maybe I will learn eventually ... hopefully :(

interrupt numbers, dma-names, node name: I will rework.

>
> Best regards,
> Krzysztof
>