linux-kernel - Re: [PATCH v2 6/8] ARM: dts: uniphier: Add ahci controller and glue layer nodes for PXs2

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Message-ID: <0a3e5fe1-0099-ef11-29f4-0d3a64ae5e9a@socionext.com>
Date:   Mon, 12 Sep 2022 21:10:40 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Arnd Bergmann <arnd@...db.de>, soc@...nel.org,
        Olof Johansson <olof@...om.net>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/8] ARM: dts: uniphier: Add ahci controller and glue
 layer nodes for PXs2

Hi Arnd,

On 2022/09/12 17:36, Arnd Bergmann wrote:
> On Mon, Sep 12, 2022, at 9:15 AM, Kunihiko Hayashi wrote:
>> Add ahci controller and glue layer nodes including reset and phy.
>> This supports for PXs2 and the boards without PXs2 vodka board that
>> doesn't implement any SATA connectors.
>>
>> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
>> +		ahci: ahci@...00000 {
>> +			compatible = "socionext,uniphier-pxs2-ahci",
>> +				     "generic-ahci";
>> +			status = "disabled";
>> +			reg = <0x65600000 0x10000>;
>> +			interrupts = <GIC_SPI 142 IRQ_TYPE_LEVEL_HIGH>;
>> +			clocks = <&sys_clk 28>;
>> +			resets = <&sys_rst 28>, <&ahci_rst 0>;
>> +			ports-implemented = <1>;
>> +			phys = <&ahci_phy>;
>> +		};
>> +
>> +		ahci-glue@...00000 {
>> +			compatible = "socionext,uniphier-pxs2-ahci-glue",
>> +				     "simple-mfd";
> 
> Here as well, the "ahci-glue" name seems rather unusual for a node
> name. What does it actually do, and why is this not just part of
> the sata node?

According to ata/sata-common.yaml, "ahci@...00000" node for generic SATA
host controller is better expressed as "sata@...00000". I'll fix it.

However, "ahci-glue@...00000" is the integration of SATA related functions
(reset and phy). Maybe "sata-controller" seems to be the best, but
I couldn't find this usage.

>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +			ranges = <0 0x65700000 0x100>;
>> +
>> +			ahci_rst: reset@0 {
>> +				compatible =
> "socionext,uniphier-pxs2-ahci-reset";
> 
> I think the node name here should be "reset-controller@0".

Yes, I'll fix it.

>> +
>> +			ahci_phy: phy@10 {
>> +				compatible =
> "socionext,uniphier-pxs2-ahci-phy";
> 
> and "sata-phy@10" here.

I'll fix it too.

Thank you,

---
Best Regards
Kunihiko Hayashi