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Date: Wed, 29 Jun 2022 15:08:01 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
Paul Cercueil <paul@...pouillou.net>
Cc: Rahul Bedarkar <rahulbedarkar89@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Matthias Brugger <matthias.bgg@...il.com>,
Sergio Paracuellos <sergio.paracuellos@...il.com>,
linux-mips@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] MIPS: dts: correct gpio-keys names and properties
On 25.06.2022 23:25, Krzysztof Kozlowski wrote:
> On 25/06/2022 22:15, Paul Cercueil wrote:
>> Hi Krzysztof,
>>
>> Le sam., juin 25 2022 at 21:58:08 +0200, Krzysztof Kozlowski
>> <krzysztof.kozlowski@...aro.org> a écrit :
>>> On 24/06/2022 20:40, Paul Cercueil wrote:
>>>> Hi Krzysztof,
>>>>
>>>> Le ven., juin 24 2022 at 19:07:39 +0200, Krzysztof Kozlowski
>>>> <krzysztof.kozlowski@...aro.org> a écrit :
>>>>> gpio-keys children do not use unit addresses.
>>>>>
>>>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>>>>
>>>>> ---
>>>>>
>>>>> See:
>>>>>
>>>>> https://lore.kernel.org/all/20220616005224.18391-1-krzysztof.kozlowski@linaro.org/
>>>>> ---
>>>>> arch/mips/boot/dts/img/pistachio_marduk.dts | 4 +--
>>>>> arch/mips/boot/dts/ingenic/gcw0.dts | 31
>>>>> +++++++++----------
>>>>> arch/mips/boot/dts/ingenic/rs90.dts | 18 +++++------
>>>>> arch/mips/boot/dts/pic32/pic32mzda_sk.dts | 9 ++----
>>>>> .../boot/dts/qca/ar9132_tl_wr1043nd_v1.dts | 6 ++--
>>>>> arch/mips/boot/dts/qca/ar9331_dpt_module.dts | 4 +--
>>>>> .../mips/boot/dts/qca/ar9331_dragino_ms14.dts | 6 ++--
>>>>> arch/mips/boot/dts/qca/ar9331_omega.dts | 4 +--
>>>>> .../qca/ar9331_openembed_som9331_board.dts | 4 +--
>>>>> arch/mips/boot/dts/qca/ar9331_tl_mr3020.dts | 8 ++---
>>>>> 10 files changed, 37 insertions(+), 57 deletions(-)
>>>>>
>>>>> diff --git a/arch/mips/boot/dts/img/pistachio_marduk.dts
>>>>> b/arch/mips/boot/dts/img/pistachio_marduk.dts
>>>>> index a8708783f04b..a8da2f992b1a 100644
>>>>> --- a/arch/mips/boot/dts/img/pistachio_marduk.dts
>>>>> +++ b/arch/mips/boot/dts/img/pistachio_marduk.dts
>>>>> @@ -59,12 +59,12 @@ led-1 {
>>>>>
>>>>> keys {
>>>>> compatible = "gpio-keys";
>>>>> - button@1 {
>>>>> + button-1 {
>>>>> label = "Button 1";
>>>>> linux,code = <0x101>; /* BTN_1 */
>>>>> gpios = <&gpio3 6 GPIO_ACTIVE_LOW>;
>>>>> };
>>>>> - button@2 {
>>>>> + button-2 {
>>>>> label = "Button 2";
>>>>> linux,code = <0x102>; /* BTN_2 */
>>>>> gpios = <&gpio2 14 GPIO_ACTIVE_LOW>;
>>>>> diff --git a/arch/mips/boot/dts/ingenic/gcw0.dts
>>>>> b/arch/mips/boot/dts/ingenic/gcw0.dts
>>>>> index 4abb0318416c..5d33f26fd28c 100644
>>>>> --- a/arch/mips/boot/dts/ingenic/gcw0.dts
>>>>> +++ b/arch/mips/boot/dts/ingenic/gcw0.dts
>>>>> @@ -130,89 +130,86 @@ backlight: backlight {
>>>>>
>>>>> gpio-keys {
>>>>> compatible = "gpio-keys";
>>>>> - #address-cells = <1>;
>>>>> - #size-cells = <0>;
>>>>
>>>> Are you sure you can remove these?
>>>
>>> Yes, from DT spec point of view, DT bindings and Linux implementation.
>>> However this particular change was not tested, except building.
>>>
>>>>
>>>> Looking at paragraph 2.3.5 of the DT spec, I would think they have
>>>> to
>>>> stay (although with #address-cells = <0>).
>>>
>>> The paragraph 2.3.5 says nothing about regular properties (which can
>>> be
>>> also child nodes). It says about children of a bus, right? It's not
>>> related here, it's not a bus.
>>
>> I quote:
>> "A DTSpec-compliant boot program shall supply #address-cells and
>> #size-cells on all nodes that have children."
>
> And paragraph 2.2.3 says:
> "A unit address may be omitted if the full path to the node is unambiguous."
>
> You have address/size cells for nodes with children having unit
> addresses. If they don't unit addresses, you don't add address/size
> cells (with some exceptions).
>
> The paragraph 2.3.5 mentions "child device nodes" and these properties
> are not devices, although I agree that DT spec here is actually confusing.
>
>>
>> The gpio-keys node has children nodes, therefore it should have
>> #address-cells and #size-cells, there's no room for interpretation here.
>>
>>> Second, why exactly this one gpio-keys node is different than all
>>> other
>>> gpio-keys everywhere and than bindings? Why this one has to be
>>> incompatible/wrong according to bindings (which do not allow
>>> address-cells and nodes with unit addresses)?
>>
>> Nothing is different. I'm just stating that your proposed fix is
>> invalid if we want to enforce compliance with the DT spec.
>
> In such case, we rather enforce the compliance with the bindings.
>
> Best regards,
> Krzysztof
I recall them to be unnecessary as well. I have a patch of mine applied
identical to this:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8c9f00d4b05134164e462f27b21c8295255ffa64
Also, I don't see any warnings with this patch applied:
$ ARCH=mips CROSS_COMPILE=mipsel-linux-gnu- make clean dtbs -j$(nproc)
SYNC include/config/auto.conf.cmd
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/conf.o
HOSTCC scripts/kconfig/confdata.o
HOSTCC scripts/kconfig/expr.o
LEX scripts/kconfig/lexer.lex.c
YACC scripts/kconfig/parser.tab.[ch]
HOSTCC scripts/kconfig/menu.o
HOSTCC scripts/kconfig/preprocess.o
HOSTCC scripts/kconfig/symbol.o
HOSTCC scripts/kconfig/util.o
HOSTCC scripts/kconfig/lexer.lex.o
HOSTCC scripts/kconfig/parser.tab.o
HOSTLD scripts/kconfig/conf
HOSTCC scripts/dtc/dtc.o
HOSTCC scripts/dtc/flattree.o
HOSTCC scripts/dtc/fstree.o
HOSTCC scripts/dtc/data.o
HOSTCC scripts/dtc/livetree.o
HOSTCC scripts/dtc/treesource.o
HOSTCC scripts/dtc/srcpos.o
HOSTCC scripts/dtc/checks.o
HOSTCC scripts/dtc/util.o
LEX scripts/dtc/dtc-lexer.lex.c
YACC scripts/dtc/dtc-parser.tab.[ch]
HOSTCC scripts/dtc/libfdt/fdt.o
HOSTCC scripts/dtc/libfdt/fdt_ro.o
HOSTCC scripts/dtc/libfdt/fdt_wip.o
HOSTCC scripts/dtc/libfdt/fdt_sw.o
HOSTCC scripts/dtc/libfdt/fdt_rw.o
HOSTCC scripts/dtc/libfdt/fdt_strerror.o
HOSTCC scripts/dtc/libfdt/fdt_empty_tree.o
HOSTCC scripts/dtc/libfdt/fdt_addresses.o
HOSTCC scripts/dtc/libfdt/fdt_overlay.o
HOSTCC scripts/dtc/fdtoverlay.o
HOSTCC scripts/dtc/dtc-lexer.lex.o
HOSTCC scripts/dtc/dtc-parser.tab.o
HOSTLD scripts/dtc/fdtoverlay
HOSTLD scripts/dtc/dtc
DTC arch/mips/boot/dts/ingenic/gcw0.dtb
Have my acked-by.
Acked-by: Arınç ÜNAL <arinc.unal@...nc9.com>
Arınç
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