linux-kernel - Re: [PATCH net-next 5/5] arm64: dts: ti: k3-am625-sk: Add cpsw3g cpts PPS support

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Message-ID: <566700c6-df9b-739b-81ff-8745eea10ff3@ti.com>
Date:   Tue, 17 Jan 2023 10:58:38 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     Vignesh Raghavendra <vigneshr@...com>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski@...aro.org>,
        <krzysztof.kozlowski+dt@...aro.org>,
        Roger Quadros <rogerq@...nel.org>, <nm@...com>,
        <kristo@...nel.org>, <nsekhar@...com>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: Re: [PATCH net-next 5/5] arm64: dts: ti: k3-am625-sk: Add cpsw3g cpts
 PPS support

Vignesh,

On 16/01/23 22:00, Vignesh Raghavendra wrote:
> 
> 
> On 16/01/23 9:35 pm, Roger Quadros wrote:
>>>>> diff --git a/arch/arm64/boot/dts/ti/k3-am625-sk.dts b/arch/arm64/boot/dts/ti/k3-am625-sk.dts
>>>>> index 4f179b146cab..962a922cc94b 100644
>>>>> --- a/arch/arm64/boot/dts/ti/k3-am625-sk.dts
>>>>> +++ b/arch/arm64/boot/dts/ti/k3-am625-sk.dts
>>>>> @@ -366,6 +366,10 @@ &cpsw3g {
>>>>>  	pinctrl-names = "default";
>>>>>  	pinctrl-0 = <&main_rgmii1_pins_default
>>>>>  		     &main_rgmii2_pins_default>;
>>>>> +
>>>>> +	cpts@...00 {
>>>>> +		ti,pps = <2 1>;
>>>>> +	};
>>>>>  };
>>>>>  
>>>>>  &cpsw_port1 {
>>>>> @@ -464,3 +468,19 @@ partition@...0000 {
>>>>>  		};
>>>>>  	};
>>>>>  };
>>>>> +
>>>>> +#define TS_OFFSET(pa, val)	(0x4+(pa)*4) (0x10000 | val)
>>>> Should this go in ./include/dt-bindings/pinctrl/k3.h ?
>>>> That way every board DT file doesn't have to define it.
>>>>
>>>> The name should be made more platform specific.
>>>> e.g. K3_TS_OFFSET if it is the same for all K3 platforms.
>>>> If not then please add Platform name instead of K3.
>>> The offsets are board specific. If it is acceptable, I will add board specific
>>> macro for the TS_OFFSET definition in the ./include/dt-bindings/pinctrl/k3.h
>>> file. Please let me know.
>> If it is board specific then it should remain in the board file.
> 
> 
> The values you pass to macro maybe board specific. But the macro
> definition itself same for a given SoC right? Also, is its same across
> K3 family ?
> 
> Please use SoC specific prefix like AM62X_TS_OFFSET() or K3_TS_OFFSET()
> accordingly.

For certain SoCs including AM62X, the macro is:
#define TS_OFFSET(pa, val)	(0x4+(pa)*4) (0x10000 | val)
while for other SoCs (refer [0]), the macro is:
#define TS_OFFSET(pa, val)	(0x4+(pa)*4) (0x80000000 | val)

Therefore, I will use SoC specific prefix in the macro. Please let me know if
the SoC specific macro can be added to the ./include/dt-bindings/pinctrl/k3.h
file for each SoC. If not, I will add the SoC specific macro in the board file
itself.

[0] https://lwn.net/Articles/819313/

Regards,
Siddharth.