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Date:   Mon, 5 Sep 2022 19:12:26 +0200
From:   Pali =?utf-8?B?Um9ow6Fy?= <pali@kernel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc:     Florian Fainelli <f.fainelli@gmail.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Gregory Clement <gregory.clement@bootlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Marek Behun <marek.behun@nic.cz>,
        linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ARM: dts: turris-omnia: Add mcu node
Message-ID: <20220905171226.fla6i5cgrx2lbq3u@pali>
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On Monday 05 September 2022 18:34:48 Krzysztof Kozlowski wrote:
> On 05/09/2022 18:19, Florian Fainelli wrote:
> > 
> > 
> > On 9/3/2022 8:27 AM, Pali Rohár wrote:
> >> On Friday 02 September 2022 00:45:58 Andrew Lunn wrote:
> >>> On Wed, Aug 31, 2022 at 04:28:09PM +0200, Pali Rohár wrote:
> >>>> PING?
> >>>>
> >>>> On Friday 19 August 2022 15:11:52 Pali Rohár wrote:
> >>>>> At i2c address 0x2a is MCU command interface which provides access to GPIOs
> >>>>> connected to Turris Omnia MCU. So define mcu node in Turris Omnia DTS file.
> >>>>>
> >>>>> Signed-off-by: Pali Rohár <pali@kernel.org>
> >>>>>
> >>>>> ---
> >>>>> Same change was already sent to U-Boot project together with driver. As
> >>>>> Turris Omnia DTS file is shared between Linux kernel U-Boot, I'm sending
> >>>>> this change also in Linux. There is a plan to write also Linux driver for
> >>>>> Turris Omnia MCU, like there is already in U-Boot.
> >>>>>
> >>>>> https://source.denx.de/u-boot/u-boot/-/commit/832738974806e6264a3d0ac2aaa92d0f662fd128
> >>>>> https://source.denx.de/u-boot/u-boot/-/blob/master/drivers/gpio/turris_omnia_mcu.c
> >>>>> ---
> >>>>>   arch/arm/boot/dts/armada-385-turris-omnia.dts | 8 +++++++-
> >>>>>   1 file changed, 7 insertions(+), 1 deletion(-)
> >>>>>
> >>>>> diff --git a/arch/arm/boot/dts/armada-385-turris-omnia.dts b/arch/arm/boot/dts/armada-385-turris-omnia.dts
> >>>>> index f4878df39753..f655e9229d68 100644
> >>>>> --- a/arch/arm/boot/dts/armada-385-turris-omnia.dts
> >>>>> +++ b/arch/arm/boot/dts/armada-385-turris-omnia.dts
> >>>>> @@ -184,7 +184,13 @@
> >>>>>   			#size-cells = <0>;
> >>>>>   			reg = <0>;
> >>>>>   
> >>>>> -			/* STM32F0 command interface at address 0x2a */
> >>>>> +			/* MCU command i2c API */
> >>>>> +			mcu: mcu@2a {
> >>>>> +				compatible = "cznic,turris-omnia-mcu";
> >>>>> +				reg = <0x2a>;
> >>>>> +				gpio-controller;
> >>>>> +				#gpio-cells = <3>;
> >>>>> +			};
> >>>
> >>> Please document the binding, preferably in yaml.
> >>
> >> I'm not going to send any new yaml dt binding document as I see that
> >> dt bindings is clearly deprecated project. Either patches for dt
> >> bindings are waiting without any answer for months (maybe year?) or
> >> patches are ignored/not accepted by beyond reasons or there are request
> >> for changes which cannot work on the real hardware or that new yaml
> >> cannot be parsed/validated due to ton of bugs in other schemas.
> > 
> > These are some pretty hard statements that are not nearly true, maybe 
> > they are based upon your past experience, but Rob and Krysztof provide 
> > feedback within a few days at most on DT bindings and DTS files.
> 
> Pali, you wrote in the past that you cannot run one command to install
> dtschema ("pip") thus for you this automated testing is
> difficult/broken/non working. If running one "pip" command is not
> possible, what I can say more? Shall I login to your machine and set it
> up? Or did you configure your machine that way, that it is not possible
> to run one pip command?

Sorry no, it is too late. I have already lost interested in it. For me
it is like a ride on the dead horse.

> Whether the patches are waiting for months and years is difficult to
> address to, without actual links. Because for sure you will be able to
> find one patch which was missed in our inboxes and you did not get an
> answer...  With Rob we both work much more than reasonable/healthy 8h
> per day... Yet I recall you always received feedback, just not always
> what you expected or wanted.

Now I have replied to one example email without a reaction. Another
example is this https://github.com/devicetree-org/dt-schema/pull/64
which completely blocked any improvements which I proposed in PCIe core
code for fixing PCIe state machine. After half of year of waiting I
decided to stop any work on this as I see it is dead those schemas.
Other examples are that received feedback suggest to do change which
does not work on the real hardware. So yes, I cannot accept, expect or
want something like that. Schema which works in that ultra-supper-duper
software but DTS written according to it does not work on the real
hardware is for me useless...

> This binding here was never sent to mailing list:
> https://lore.kernel.org/all/?q=cznic%2Cturris-omnia-mcu
> 
> >> Sorry, this is just a waste of time and energy to write new those yamls
> >> as it does not bring any value.
> 
> It brings quite nice value - allows to check whether your bindings and
> your DTS are correct. Any difficulty to install and run dtschema is not
> equal to "does not bring any value"...

It just took lot of my time and did nothing useful. Hence for it it has
zero value.

> Anyway devices cannot go without bindings, thus it's a NAK.
> 
> Best regards,
> Krzysztof