linux-kernel - Re: [STLinux Kernel] [PATCH 3/4] ARM: DT: STi: Add DT node for MiPHY365x

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Date:	Tue, 20 May 2014 10:41:07 +0200
From:	Maxime Coquelin <maxime.coquelin@...com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <kernel@...inux.com>,
	Srinivas Kandagatla <srinivas.kandagatla@...com>
Subject: Re: [STLinux Kernel] [PATCH 3/4] ARM: DT: STi: Add DT node for MiPHY365x



On 05/20/2014 10:28 AM, Lee Jones wrote:
>>>>> The MiPHY365x is a Generic PHY which can serve various SATA or PCIe
>>>>> devices. It has 2 ports which it can use for either; both SATA, both
>>>>> PCIe or one of each in any configuration.
>>>>>
>>>>> Cc: Srinivas Kandagatla <srinivas.kandagatla@...com>
>>>>> Acked-by: Mark Rutland <mark.rutland@....com>
>>>>> Acked-by: Alexandre Torgue <alexandre.torgue@...com>
>>>>> Signed-off-by: Lee Jones <lee.jones@...aro.org>
>>>>> ---
>>>>>   arch/arm/boot/dts/stih416-b2020-revE.dts | 22 ++++++++++++++++++++++
>>>>>   arch/arm/boot/dts/stih416-b2020.dts      |  6 ++++++
>>>>>   arch/arm/boot/dts/stih416.dtsi           | 14 ++++++++++++++
>>>>>   3 files changed, 42 insertions(+)
>>>>>   create mode 100644 arch/arm/boot/dts/stih416-b2020-revE.dts
>>>>>
>>>>> diff --git a/arch/arm/boot/dts/stih416-b2020-revE.dts b/arch/arm/boot/dts/stih416-b2020-revE.dts
>>>>> new file mode 100644
>>>>> index 0000000..23fdaf7
>>>>> --- /dev/null
>>>>> +++ b/arch/arm/boot/dts/stih416-b2020-revE.dts
>>>>> @@ -0,0 +1,22 @@
>>>>> +/*
>>>>> + * Copyright (C) 2014 STMicroelectronics Limited.
>>>>> + * Author: Lee Jones <lee.jones@...aro.org>
>>>>> + *
>>>>> + * This program is free software; you can redistribute it and/or modify
>>>>> + * it under the terms of the GNU General Public License version 2 as
>>>>> + * publishhed by the Free Software Foundation.
>>>>> + */
>>>>> +/dts-v1/;
>>>>> +#include "stih416.dtsi"
>>>>> +#include "stih41x-b2020.dtsi"
>>>>> +/ {
>>>>> +        model = "STiH416 B2020 REV-E";
>>>>> +	compatible = "st,stih416-b2020", "st,stih416";
>>>>> +
>>>>> +	soc {
>>>>> +		miphy365x_phy: miphy365x@...82000 {
>>>>> +			st,pcie-tx-pol-inv;
>>>>> +			st,sata-gen = <3>;
>>>>> +		};
>>>>> +	};
>>>>> +};
>>>> Shouldn't this new board being added in a separate patch?
>>>
>>> I certainly can do that, but I don't think that it's necessary?
>>
>> I think it is, as you introduce a new board.
>
> Introducing an empty dts file just so you can say "this is a new
> board" seems odd to me, but I'll go with whatever you feel it right.
>
>> Moreover, the miphy description being the same as in
>> stih416-b2020.dts, so I don't understand why you introduce this
>> board for this feature.
>
> It's historical.  There are other differences between rev-E and the
> other reversions, such as; gpio-leds (red, green) and the reset GPIO
> for ethernet.  As these are dts files (rather than dtsi) files, you
> can only use one at a time.

My point was to create a new patch that would also introduce the 
differences (Ethernet, leds...). The commit message would explain the 
differences versus stih416-b2020.

 From your patch, if I didn't know the differences, I would ask why you 
don't use stih416-b2020.dts.

If you have another pending patch that make Ethernet to work on revE 
board, you can keep this one as it is.

>
>>>>> diff --git a/arch/arm/boot/dts/stih416-b2020.dts b/arch/arm/boot/dts/stih416-b2020.dts
>>>>> index 276f28d..172f222 100644
>>>>> --- a/arch/arm/boot/dts/stih416-b2020.dts
>>>>> +++ b/arch/arm/boot/dts/stih416-b2020.dts
>>>>> @@ -13,4 +13,10 @@
>>>>>   	model = "STiH416 B2020";
>>>>>   	compatible = "st,stih416", "st,stih416-b2020";
>>>>>
>>>>> +	soc {
>>>>> +		miphy365x_phy: miphy365x@...82000 {
>>>>> +			st,pcie-tx-pol-inv;
>>>>> +			st,sata-gen = <3>;
>>>>> +		};
>>>>> +	};
>>>>>   };
>>>> ...
>>>
>
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