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Date: Thu, 4 Apr 2024 14:02:21 +0530
From: Siddharth Vadapalli <s-vadapalli@ti.com>
To: Krzysztof Kozlowski <krzk@kernel.org>
CC: Siddharth Vadapalli <s-vadapalli@ti.com>, <lee@kernel.org>,
        <robh@kernel.org>, <krzk+dt@kernel.org>, <conor+dt@kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <srk@ti.com>
Subject: Re: [PATCH] dt-bindings: mfd: syscon: Add ti,am62p-cpsw-mac-efuse
 compatible
Message-ID: <a895ddc8-5c18-49d7-86c4-b995bb946914@ti.com>
References: <20240402105708.4114146-1-s-vadapalli@ti.com>
 <2e9b6a91-43d3-4b23-830d-40e607505d8c@kernel.org>
 <30065bdc-ccef-4610-b1c1-7661f801b8e9@ti.com>
 <4b1380a8-0136-4395-ba42-9bcff2e1bdb0@kernel.org>
 <aabea385-16e0-4116-a12b-3ce1e06574e3@ti.com>
 <eb7a0d5c-c197-44b9-baea-e9b54792b447@kernel.org>
 <af61424e-7006-49f5-b614-3caa3674685a@ti.com>
 <083e50de-1c99-4a58-8b55-4dec26d97c1b@kernel.org>
 <9bca7d94-142e-4717-aea7-437805717a00@ti.com>
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On Wed, Apr 03, 2024 at 12:18:10PM +0530, Siddharth Vadapalli wrote:
> On Wed, Apr 03, 2024 at 08:40:19AM +0200, Krzysztof Kozlowski wrote:
> > On 03/04/2024 08:32, Siddharth Vadapalli wrote:
> > > 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@ti.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.
> > > 
> > 
> > That's not the process. I will be NAKing bindings which do not have any
> > users, because I do not trust you test them.
> > 
> > The process is almost always:
> > 1. Send bindings,
> > 2. Send driver changes (if applicable) in the same patchset.
> > 3. Send DTS, usually in separate patches and provide lore link to the
> > bindings in the changelog or cover letter.
> 
> Thank you for clarifying. I will post the DTS patches corresponding to
> this patch and reference this patch in the DTS patch series.

I have posted the DTS patch at:
https://patchwork.kernel.org/project/linux-arm-kernel/patch/20240404081845.622707-1-s-vadapalli@ti.com/
indicating the dependency on this bindings patch.

Regards,
Siddharth.