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Date: Wed, 30 Mar 2022 13:45:42 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Kuldeep Singh <singh.kuldeep87k@...il.com>
Cc: linux-kernel@...r.kernel.org, Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Mark Brown <broonie@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
linux-arm-msm@...r.kernel.org, linux-spi@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH 4/4] spi: dt-bindings: qcom,spi-qup: convert to dtschema
On 30/03/2022 13:42, Kuldeep Singh wrote:
> On Tue, Mar 29, 2022 at 01:29:02PM +0200, Krzysztof Kozlowski wrote:
>> Convert the Qualcomm Universal Peripheral (QUP) Serial Peripheral
>> Interface (SPI) bindings to DT Schema.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> ---
>> .../devicetree/bindings/spi/qcom,spi-qup.txt | 103 ------------------
>> .../devicetree/bindings/spi/qcom,spi-qup.yaml | 82 ++++++++++++++
>> 2 files changed, 82 insertions(+), 103 deletions(-)
>> delete mode 100644 Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
>> create mode 100644 Documentation/devicetree/bindings/spi/qcom,spi-qup.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt b/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
>> deleted file mode 100644
>> index 5c090771c016..000000000000
>> --- a/Documentation/devicetree/bindings/spi/qcom,spi-qup.txt
>> +++ /dev/null
>> @@ -1,103 +0,0 @@
>> -Qualcomm Universal Peripheral (QUP) Serial Peripheral Interface (SPI)
>> -
>> -The QUP core is an AHB slave that provides a common data path (an output FIFO
>> -and an input FIFO) for serial peripheral interface (SPI) mini-core.
>> -
>> -SPI in master mode supports up to 50MHz, up to four chip selects, programmable
>> -data path from 4 bits to 32 bits and numerous protocol variants.
>> -
>> -Required properties:
>> -- compatible: Should contain:
>> - "qcom,spi-qup-v1.1.1" for 8660, 8960 and 8064.
>> - "qcom,spi-qup-v2.1.1" for 8974 and later
>> - "qcom,spi-qup-v2.2.1" for 8974 v2 and later.
>> -
>> -- reg: Should contain base register location and length
>> -- interrupts: Interrupt number used by this controller
>> -
>> -- clocks: Should contain the core clock and the AHB clock.
>> -- clock-names: Should be "core" for the core clock and "iface" for the
>> - AHB clock.
>> -
>> -- #address-cells: Number of cells required to define a chip select
>> - address on the SPI bus. Should be set to 1.
>> -- #size-cells: Should be zero.
>> -
>> -Optional properties:
>> -- spi-max-frequency: Specifies maximum SPI clock frequency,
>> - Units - Hz. Definition as per
>> - Documentation/devicetree/bindings/spi/spi-bus.txt
>> -- num-cs: total number of chipselects
>> -- cs-gpios: should specify GPIOs used for chipselects.
>> - The gpios will be referred to as reg = <index> in the SPI child
>> - nodes. If unspecified, a single SPI device without a chip
>> - select can be used.
>> -
>> -- dmas: Two DMA channel specifiers following the convention outlined
>> - in bindings/dma/dma.txt
>> -- dma-names: Names for the dma channels, if present. There must be at
>> - least one channel named "tx" for transmit and named "rx" for
>> - receive.
>> -
>> -SPI slave nodes must be children of the SPI master node and can contain
>> -properties described in Documentation/devicetree/bindings/spi/spi-bus.txt
>> -
>> -Example:
>> -
>> - spi_8: spi@...64000 { /* BLSP2 QUP2 */
>> -
>> - compatible = "qcom,spi-qup-v2";
>> - #address-cells = <1>;
>> - #size-cells = <0>;
>> - reg = <0xf9964000 0x1000>;
>> - interrupts = <0 102 0>;
>> - spi-max-frequency = <19200000>;
>> -
>> - clocks = <&gcc GCC_BLSP2_QUP2_SPI_APPS_CLK>, <&gcc GCC_BLSP2_AHB_CLK>;
>> - clock-names = "core", "iface";
>> -
>> - dmas = <&blsp1_bam 13>, <&blsp1_bam 12>;
>> - dma-names = "rx", "tx";
>> -
>> - pinctrl-names = "default";
>> - pinctrl-0 = <&spi8_default>;
>> -
>> - device@0 {
>> - compatible = "arm,pl022-dummy";
>> - #address-cells = <1>;
>> - #size-cells = <1>;
>> - reg = <0>; /* Chip select 0 */
>> - spi-max-frequency = <19200000>;
>> - spi-cpol;
>> - };
>> -
>> - device@1 {
>> - compatible = "arm,pl022-dummy";
>> - #address-cells = <1>;
>> - #size-cells = <1>;
>> - reg = <1>; /* Chip select 1 */
>> - spi-max-frequency = <9600000>;
>> - spi-cpha;
>> - };
>> -
>> - device@2 {
>> - compatible = "arm,pl022-dummy";
>> - #address-cells = <1>;
>> - #size-cells = <1>;
>> - reg = <2>; /* Chip select 2 */
>> - spi-max-frequency = <19200000>;
>> - spi-cpol;
>> - spi-cpha;
>> - };
>> -
>> - device@3 {
>> - compatible = "arm,pl022-dummy";
>> - #address-cells = <1>;
>> - #size-cells = <1>;
>> - reg = <3>; /* Chip select 3 */
>> - spi-max-frequency = <19200000>;
>> - spi-cpol;
>> - spi-cpha;
>> - spi-cs-high;
>> - };
>> - };
>> diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qup.yaml b/Documentation/devicetree/bindings/spi/qcom,spi-qup.yaml
>> new file mode 100644
>> index 000000000000..aa5756f7ba85
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/spi/qcom,spi-qup.yaml
>> @@ -0,0 +1,82 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/spi/qcom,spi-qup.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm Universal Peripheral (QUP) Serial Peripheral Interface (SPI)
>> +
>> +maintainers:
>> + - Andy Gross <agross@...nel.org>
>> + - Bjorn Andersson <bjorn.andersson@...aro.org>
>> + - Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> +
>> +description:
>> + The QUP core is an AHB slave that provides a common data path (an output FIFO
>> + and an input FIFO) for serial peripheral interface (SPI) mini-core.
>> +
>> + SPI in master mode supports up to 50MHz, up to four chip selects,
>> + programmable data path from 4 bits to 32 bits and numerous protocol variants.
>> +
>> +allOf:
>> + - $ref: /spi/spi-controller.yaml#
>
> Same thing for reference here as we discussed on other thread.
Yes.
>
>> +
>> +properties:
>> + compatible:
>> + enum:
>> + - qcom,spi-qup-v1.1.1 # for 8660, 8960 and 8064
>> + - qcom,spi-qup-v2.1.1 # for 8974 and later
>> + - qcom,spi-qup-v2.2.1 # for 8974 v2 and later
>> +
>> + clocks:
>> + maxItems: 2
>> +
>> + clock-names:
>> + items:
>> + - const: core
>> + - const: iface
>> +
>> + dmas:
>> + maxItems: 2
>> +
>> + dma-names:
>> + items:
>> + - const: tx
>> + - const: rx
>
> Just wanted to confirm one thing, did you try with rx-tx?
> As once I noticed for some other spec, that warnings were reduced when
> order was reversed as most of the DTs follow rx-tx order.
>
> We can keep order which disturb less DTs.
Yeah, I tried. The amount is more or less the same, so I went with tx-rx
as mentioned in original bindings.
>
>> +
>> + interrupts:
>> + maxItems: 1
>> +
>> + reg:
>> + maxItems: 1
>> +
>> +required:
>> + - compatible
>> + - clocks
>> + - clock-names
>> + - interrupts
>> + - reg
>> +
>> +unevaluatedProperties: false
>> +
>> +examples:
>> + - |
>> + #include <dt-bindings/clock/qcom,gcc-msm8996.h>
>> + #include <dt-bindings/interrupt-controller/arm-gic.h>
>> +
>> + spi@...5000 {
>> + compatible = "qcom,spi-qup-v2.2.1";
>> + reg = <0x07575000 0x600>;
>> + interrupts = <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>;
>> + clocks = <&gcc GCC_BLSP1_QUP1_SPI_APPS_CLK>,
>> + <&gcc GCC_BLSP1_AHB_CLK>;
>> + clock-names = "core",
>> + "iface";
>
> clock-names can be written in one line.
I made it on purpose to align the format with clocks.
Best regards,
Krzysztof
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