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Message-ID: <CAL_Jsq+yWL3ZSnvHbGb4B0zHptQtFXjvOUJe0pNSHmH05GN-PA@mail.gmail.com>
Date: Thu, 26 Sep 2019 14:19:41 -0500
From: Rob Herring <robh+dt@...nel.org>
To: Maciej Falkowski <m.falkowski@...sung.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
devicetree@...r.kernel.org,
dri-devel <dri-devel@...ts.freedesktop.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
Mark Rutland <mark.rutland@....com>,
Inki Dae <inki.dae@...sung.com>
Subject: Re: [PATCH v2] dt-bindings: gpu: Convert Samsung Image Scaler to dt-schema
On Thu, Sep 26, 2019 at 11:54 AM Maciej Falkowski
<m.falkowski@...sung.com> wrote:
>
>
> On 9/26/19 5:35 PM, Rob Herring wrote:
> > On Thu, Sep 26, 2019 at 9:47 AM Maciej Falkowski
> > <m.falkowski@...sung.com> wrote:
> >>
> >> On 9/26/19 4:03 PM, Krzysztof Kozlowski wrote:
> >>> On Thu, Sep 26, 2019 at 02:56:14PM +0200, Marek Szyprowski wrote:
> >>>> From: Maciej Falkowski <m.falkowski@...sung.com>
> >>>>
> >>>> Convert Samsung Image Scaler to newer dt-schema format.
> >>>>
> >>>> Signed-off-by: Maciej Falkowski <m.falkowski@...sung.com>
> >>>> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> >>>> ---
> >>>> v2:
> >>>> - Removed quotation marks from string in 'compatible' property
> >>>> - Added if-then statement for 'clocks' and 'clock-names' property
> >>>> - Added include directive to example
> >>>> - Added GIC_SPI macro to example
> >>>>
> >>>> Best regards,
> >>>> Maciej Falkowski
> >>>> ---
> >>>> .../bindings/gpu/samsung-scaler.txt | 27 -------
> >>>> .../bindings/gpu/samsung-scaler.yaml | 71 +++++++++++++++++++
> >>>> 2 files changed, 71 insertions(+), 27 deletions(-)
> >>>> delete mode 100644 Documentation/devicetree/bindings/gpu/samsung-scaler.txt
> >>>> create mode 100644 Documentation/devicetree/bindings/gpu/samsung-scaler.yaml
> >>>>
> >>>> diff --git a/Documentation/devicetree/bindings/gpu/samsung-scaler.txt b/Documentation/devicetree/bindings/gpu/samsung-scaler.txt
> >>>> deleted file mode 100644
> >>>> index 9c3d98105dfd..000000000000
> >>>> --- a/Documentation/devicetree/bindings/gpu/samsung-scaler.txt
> >>>> +++ /dev/null
> >>>> @@ -1,27 +0,0 @@
> >>>> -* Samsung Exynos Image Scaler
> >>>> -
> >>>> -Required properties:
> >>>> - - compatible : value should be one of the following:
> >>>> - (a) "samsung,exynos5420-scaler" for Scaler IP in Exynos5420
> >>>> - (b) "samsung,exynos5433-scaler" for Scaler IP in Exynos5433
> >>>> -
> >>>> - - reg : Physical base address of the IP registers and length of memory
> >>>> - mapped region.
> >>>> -
> >>>> - - interrupts : Interrupt specifier for scaler interrupt, according to format
> >>>> - specific to interrupt parent.
> >>>> -
> >>>> - - clocks : Clock specifier for scaler clock, according to generic clock
> >>>> - bindings. (See Documentation/devicetree/bindings/clock/exynos*.txt)
> >>>> -
> >>>> - - clock-names : Names of clocks. For exynos scaler, it should be "mscl"
> >>>> - on 5420 and "pclk", "aclk" and "aclk_xiu" on 5433.
> >>>> -
> >>>> -Example:
> >>>> - scaler@...00000 {
> >>>> - compatible = "samsung,exynos5420-scaler";
> >>>> - reg = <0x12800000 0x1294>;
> >>>> - interrupts = <0 220 IRQ_TYPE_LEVEL_HIGH>;
> >>>> - clocks = <&clock CLK_MSCL0>;
> >>>> - clock-names = "mscl";
> >>>> - };
> >>>> diff --git a/Documentation/devicetree/bindings/gpu/samsung-scaler.yaml b/Documentation/devicetree/bindings/gpu/samsung-scaler.yaml
> >>>> new file mode 100644
> >>>> index 000000000000..af19930d052e
> >>>> --- /dev/null
> >>>> +++ b/Documentation/devicetree/bindings/gpu/samsung-scaler.yaml
> >>>> @@ -0,0 +1,71 @@
> >>>> +# SPDX-License-Identifier: GPL-2.0
> >>>> +%YAML 1.2
> >>>> +---
> >>>> +$id: https://protect2.fireeye.com/url?k=1ffa720fd467d028.1ffbf940-9a5a550397b4da2b&u=http://devicetree.org/schemas/gpu/samsung-scaler.yaml#
> >>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>>> +
> >>>> +title: Samsung Exynos SoC Image Scaler
> >>>> +
> >>>> +maintainers:
> >>>> + - Inki Dae <inki.dae@...sung.com>
> >>>> +
> >>>> +properties:
> >>>> + compatible:
> >>>> + enum:
> >>>> + - samsung,exynos5420-scaler
> >>>> + - samsung,exynos5433-scaler
> >>>> +
> >>>> + reg:
> >>>> + maxItems: 1
> >>>> +
> >>>> + interrupts:
> >>>> + maxItems: 1
> >>>> +
> >> Hi Krzysztof,
> > Please work on your quoting. Reply below what you are replying to.
> >
> >> By "Midgard" I assume that you referred to
> >> 'Documentation/devicetree/bindings/gpu/arm,mali-midgard.yaml'.
> >>
> >> I think that 'clocks' and 'clock-names' properties before if statement
> >> serve different purpose in this schema.
> >> It totally has about 10 different compatibles grouped in five pairs.
> >> Then schema declares for 'clocks' minItems as one and maxItems as two and
> >> later it overrides this boundaries with if statement for particular
> >> compatibles.
> > It's not an override, but an AND. So what's under 'properties' has to
> > be the looser constraints than what is under an if/then schema.
> Hi Rob,
> Thank you for explaining that.
> >> Well, then clearly, the purpose is to declare boundaries for all of
> >> pairs and
> >> not to provide easy-to-find definition for this properties.
> >>
> >> In my schema I directly set boundaries per compatible with single
> >> if-else statement.
> >> I didn't know what to put before then as if statement is already
> >> self-explanatory.
> >>
> >> Best regards,
> >> Maciej Falkowski
> >>
> >>> I am repeating myself... leave the clocks and clock-names.
> >>>
> >>> "I think it is worth to leave the clocks and clock-names here (could be
> >>> empty or with min/max values for number of items). This makes it easy to
> >>> find the properties by humans.
> > I agree.
> >
> > Let me put it another way. You need to add an 'additionalProperties:
> > false' and (I think) to make that work you'll need them listed here.
> >
> > Rob
>
> So when properties are only defined inside if-then scope,
> they are labeled as 'additional' as they are not defined inside
> scope of 'properties'. It is mandatory then to mention 'clock' and
> 'clock-names' there if 'additionalProperties: false' .
Yes, which makes additionalProperties a bit fragile and can't be used
if we include a common schema. There's a fix for that coming in
json-schema draft8 called 'unevaluatedProperties'.
> However I had not set it intentionally as there are additional
> properties in some bindings,
> exactly 'iommu' and 'power-domains' are undocumented.
> Is it a good way to put them in 'properties' just to be able to forbid
> additional properties?
Simply put, they should be documented too.
Rob
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