linux-kernel - Re: [PATCH] dt-bindings: mfd: syscon: Add ti,am62p-cpsw-mac-efuse compatible

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Message-ID: <af61424e-7006-49f5-b614-3caa3674685a@ti.com>
Date: Wed, 3 Apr 2024 12:02:37 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: Siddharth Vadapalli <s-vadapalli@...com>, <lee@...nel.org>,
        <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>
Subject: Re: [PATCH] dt-bindings: mfd: syscon: Add ti,am62p-cpsw-mac-efuse
 compatible

On Wed, Apr 03, 2024 at 08:27:06AM +0200, Krzysztof Kozlowski wrote:
> On 03/04/2024 07:35, Siddharth Vadapalli wrote:
> > On Tue, Apr 02, 2024 at 08:06:27PM +0200, Krzysztof Kozlowski wrote:
> >> On 02/04/2024 14:30, Siddharth Vadapalli wrote:
> >>> On Tue, Apr 02, 2024 at 02:08:32PM +0200, Krzysztof Kozlowski wrote:
> >>>> On 02/04/2024 12:57, Siddharth Vadapalli wrote:
> >>>>> The CTRLMMR_MAC_IDx registers within the CTRL_MMR space of TI's AM62p SoC
> >>>>> contain the MAC Address programmed in the eFuse. Add compatible for
> >>>>> allowing the CPSW driver to obtain a regmap for the CTRLMMR_MAC_IDx
> >>>>> registers within the System Controller device-tree node. The default MAC
> >>>>> Address for the interface corresponding to the first MAC port will be set
> >>>>> to the value programmed in the eFuse.
> >>>>>
> >>>>> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> >>>>> ---
> >>>>>
> >>>>> This patch is based on linux-next tagged next-20240402.
> >>>>
> >>>> Where is the DTS using it?
> >>>
> >>> The current implementation in the device-tree for older TI K3 SoCs is as
> >>> follows:
> >>>
> >>> 	cpsw_port1: port@1 {
> >>> 		reg = <1>;
> >>> 		ti,mac-only;
> >>> 		label = "port1";
> >>> 		phys = <&phy_gmii_sel 1>;
> >>> 		mac-address = [00 00 00 00 00 00];
> >>> 		ti,syscon-efuse = <&wkup_conf 0x200>;
> >>> 	};
> >>>
> >>> The "ti,syscon-efuse" property passes the reference to the System
> >>> Controller node as well as the offset to the CTRLMMR_MAC_IDx registers
> >>> within the CTRL_MMR space.
> >>
> >> Please reference upstream DTS or lore link to patch under review.
> > 
> > An example of the existing implementation in the device-tree for AM64x
> > is:
> > https://github.com/torvalds/linux/blob/d4e8c8ad5d14ad51ed8813442d81c43019fd669d/arch/arm64/boot/dts/ti/k3-am64-main.dtsi#L697
> > It uses:
> > 	ti,syscon-efuse = <&main_conf 0x200>;
> > 
> > and "main_conf" node is defined at:
> > https://github.com/torvalds/linux/blob/d4e8c8ad5d14ad51ed8813442d81c43019fd669d/arch/arm64/boot/dts/ti/k3-am64-main.dtsi#L40
> 
> It is quite different than your bindings, so your bindings are incorrect.

Sorry I didn't understand what you mean. The references I have provided
are for existing DTS where "main_conf"/"wkup_conf" (System Controller
nodes) have the compatible "syscon", unlike in AM62p at:
https://github.com/torvalds/linux/blob/20f8173afaac90dd9dca11be4aa602a47776077f/arch/arm64/boot/dts/ti/k3-am62p-wakeup.dtsi#L8
which has the "simple-bus" compatible for the "wkup_conf" node.

Also, shouldn't the device-tree bindings patches be posted first and get
merged before I post the device-tree patches that utilize the
compatible/properties that have been added in the bindings? That is the
reason why I had shared the "DIFF" for the DTS changes that I will be
posting once this patch for the new compatible is accepted.

Regards,
Siddharth.