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

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Date: Wed, 3 Apr 2024 11:05:05 +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 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

Regards,
Siddharth.