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Date: Fri, 13 Jan 2023 14:18:51 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-clk@...r.kernel.org
Subject: Re: [PATCH v6 2/6] dt-bindings: arm: msm: Convert and split kpss-acc
driver Documentation to yaml
On Thu, Jan 12, 2023 at 06:00:10AM +0200, Dmitry Baryshkov wrote:
> On 10/01/2023 20:32, Christian Marangi wrote:
> > Convert kpss-acc driver Documentation to yaml.
> > The original Documentation was wrong all along. Fix it while we are
> > converting it.
> > The example was wrong as kpss-acc-v2 should only expose the regs but we
> > don't have any driver that expose additional clocks. The kpss-acc driver
> > is only specific to v1. For this exact reason, split the Documentation
> > to 2 different schema, v1 as clock-controller and v2 for
> > power-controller as per msm-3.10 specification, the exposed regs handle
> > power domains.
> >
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > ---
> > .../bindings/arm/msm/qcom,kpss-acc.txt | 49 -------------
> > .../bindings/clock/qcom,kpss-acc-v1.yaml | 72 +++++++++++++++++++
> > .../bindings/power/qcom,kpss-acc-v2.yaml | 47 ++++++++++++
> > 3 files changed, 119 insertions(+), 49 deletions(-)
> > delete mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
> > create mode 100644 Documentation/devicetree/bindings/clock/qcom,kpss-acc-v1.yaml
> > create mode 100644 Documentation/devicetree/bindings/power/qcom,kpss-acc-v2.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
> > deleted file mode 100644
> > index 7f696362a4a1..000000000000
> > --- a/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
> > +++ /dev/null
> > @@ -1,49 +0,0 @@
> > -Krait Processor Sub-system (KPSS) Application Clock Controller (ACC)
> > -
> > -The KPSS ACC provides clock, power domain, and reset control to a Krait CPU.
> > -There is one ACC register region per CPU within the KPSS remapped region as
> > -well as an alias register region that remaps accesses to the ACC associated
> > -with the CPU accessing the region.
> > -
> > -PROPERTIES
> > -
> > -- compatible:
> > - Usage: required
> > - Value type: <string>
> > - Definition: should be one of:
> > - "qcom,kpss-acc-v1"
> > - "qcom,kpss-acc-v2"
> > -
> > -- reg:
> > - Usage: required
> > - Value type: <prop-encoded-array>
> > - Definition: the first element specifies the base address and size of
> > - the register region. An optional second element specifies
> > - the base address and size of the alias register region.
> > -
> > -- clocks:
> > - Usage: required
> > - Value type: <prop-encoded-array>
> > - Definition: reference to the pll parents.
> > -
> > -- clock-names:
> > - Usage: required
> > - Value type: <stringlist>
> > - Definition: must be "pll8_vote", "pxo".
> > -
> > -- clock-output-names:
> > - Usage: optional
> > - Value type: <string>
> > - Definition: Name of the output clock. Typically acpuX_aux where X is a
> > - CPU number starting at 0.
> > -
> > -Example:
> > -
> > - clock-controller@...8000 {
> > - compatible = "qcom,kpss-acc-v2";
> > - reg = <0x02088000 0x1000>,
> > - <0x02008000 0x1000>;
> > - clocks = <&gcc PLL8_VOTE>, <&gcc PXO_SRC>;
> > - clock-names = "pll8_vote", "pxo";
> > - clock-output-names = "acpu0_aux";
> > - };
> > diff --git a/Documentation/devicetree/bindings/clock/qcom,kpss-acc-v1.yaml b/Documentation/devicetree/bindings/clock/qcom,kpss-acc-v1.yaml
> > new file mode 100644
> > index 000000000000..a466e4e8aacd
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/clock/qcom,kpss-acc-v1.yaml
> > @@ -0,0 +1,72 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/clock/qcom,kpss-acc-v1.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Krait Processor Sub-system (KPSS) Application Clock Controller (ACC) v1
> > +
> > +maintainers:
> > + - Christian Marangi <ansuelsmth@...il.com>
> > +
> > +description:
> > + The KPSS ACC provides clock, power domain, and reset control to a Krait CPU.
> > + There is one ACC register region per CPU within the KPSS remapped region as
> > + well as an alias register region that remaps accesses to the ACC associated
> > + with the CPU accessing the region. ACC v1 is currently used as a
> > + clock-controller for enabling the cpu and hanling the aux clocks.
> > +
> > +properties:
> > + compatible:
> > + const: qcom,kpss-acc-v1
> > +
> > + reg:
> > + items:
> > + - description: Base address and size of the register region
> > + - description: Optional base address and size of the alias register region
> > + minItems: 1
> > +
> > + clocks:
> > + minItems: 2
> > + maxItems: 2
> > +
> > + clock-names:
> > + items:
> > + - const: pll8_vote
> > + - const: pxo
> > +
> > + clock-output-names:
> > + description: Name of the aux clock. Krait can have at most 4 cpu.
> > + enum:
> > + - acpu0_aux
> > + - acpu1_aux
> > + - acpu2_aux
> > + - acpu3_aux
> > +
> > + '#clock-cells':
> > + const: 0
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - clocks
> > + - clock-names
> > + - clock-output-names
> > + - '#clock-cells'
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/clock/qcom,gcc-ipq806x.h>
> > +
> > + clock-controller@...8000 {
> > + compatible = "qcom,kpss-acc-v1";
> > + reg = <0x02088000 0x1000>, <0x02008000 0x1000>;
> > + clocks = <&gcc PLL8_VOTE>, <&pxo_board>;
> > + clock-names = "pll8_vote", "pxo";
> > + clock-output-names = "acpu0_aux";
> > + #clock-cells = <0>;
> > + };
> > +
> > +...
> > diff --git a/Documentation/devicetree/bindings/power/qcom,kpss-acc-v2.yaml b/Documentation/devicetree/bindings/power/qcom,kpss-acc-v2.yaml
> > new file mode 100644
> > index 000000000000..91af95569ae6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/power/qcom,kpss-acc-v2.yaml
> > @@ -0,0 +1,47 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/power/qcom,kpss-acc-v2.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Krait Processor Sub-system (KPSS) Application Clock Controller (ACC) v2
> > +
> > +maintainers:
> > + - Christian Marangi <ansuelsmth@...il.com>
> > +
> > +description:
> > + The KPSS ACC provides clock, power domain, and reset control to a Krait CPU.
> > + There is one ACC register region per CPU within the KPSS remapped region as
> > + well as an alias register region that remaps accesses to the ACC associated
> > + with the CPU accessing the region. ACC v2 is currently used as a
> > + power-controller for enabling the cpu.
> > +
> > +properties:
> > + compatible:
> > + const: qcom,kpss-acc-v2
> > +
> > + reg:
> > + items:
> > + - description: Base address and size of the register region
> > + - description: Optional base address and size of the alias register region
> > + minItems: 1
> > +
> > + '#power-domain-cells':
> > + const: 0
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - '#power-domain-cells'
>
> This dictates that if at some point we implement the kps-acc-v2 driver, it
> will return a single power domain. I can not confirm that this would be the
> case. I see that you want to migrate from the clock-controller as the acc-v2
> doesn't provide clocks. I'd suggest instead using the neutral
> `power-manager@...` node name. It doesn't demand anything, so we can drop
> the (unused and unsupported) #power-domain-cells property.
>
Thanks for the review of the series and thanks for the suggestion. Will
do the change and send v7 hoping it's the final revision.
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + power-controller@...88000 {
> > + compatible = "qcom,kpss-acc-v2";
> > + reg = <0xf9088000 0x1000>,
> > + <0xf9008000 0x1000>;
> > + #power-domain-cells = <0>;
> > + };
> > +...
>
> --
> With best wishes
> Dmitry
>
--
Ansuel
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