From: Jonathan Cameron <jic23@kernel.org>
To: linux-iio@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
devicetree@vger.kernel.org
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Matheus Tavares <matheus.bernardino@usp.br>,
Alexandru Ardelean <alexandru.ardelean@analog.com>
Subject: [PATCH 01/46] dt-bindings:iio:resolver:adi,ad2s90: Conversion of binding to yaml.
Date: Sat, 31 Oct 2020 18:48:09 +0000 [thread overview]
Message-ID: <20201031184854.745828-2-jic23@kernel.org> (raw)
In-Reply-To: <20201031184854.745828-1-jic23@kernel.org>
From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Simple binding with a good description of why the spi-max-frequency is,
in practice not as high as the datasheet implies. I've set the
maximum as per the value established in the description.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Matheus Tavares <matheus.bernardino@usp.br>
Cc: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
.../bindings/iio/resolver/ad2s90.txt | 31 ----------
.../bindings/iio/resolver/adi,ad2s90.yaml | 60 +++++++++++++++++++
2 files changed, 60 insertions(+), 31 deletions(-)
diff --git a/Documentation/devicetree/bindings/iio/resolver/ad2s90.txt b/Documentation/devicetree/bindings/iio/resolver/ad2s90.txt
deleted file mode 100644
index 477d41fa6467..000000000000
--- a/Documentation/devicetree/bindings/iio/resolver/ad2s90.txt
+++ /dev/null
@@ -1,31 +0,0 @@
-Analog Devices AD2S90 Resolver-to-Digital Converter
-
-https://www.analog.com/en/products/ad2s90.html
-
-Required properties:
- - compatible: should be "adi,ad2s90"
- - reg: SPI chip select number for the device
- - spi-max-frequency: set maximum clock frequency, must be 830000
- - spi-cpol and spi-cpha:
- Either SPI mode (0,0) or (1,1) must be used, so specify none or both of
- spi-cpha, spi-cpol.
-
-See for more details:
- Documentation/devicetree/bindings/spi/spi-bus.txt
-
-Note about max frequency:
- Chip's max frequency, as specified in its datasheet, is 2Mhz. But a 600ns
- delay is expected between the application of a logic LO to CS and the
- application of SCLK, as also specified. And since the delay is not
- implemented in the spi code, to satisfy it, SCLK's period should be at most
- 2 * 600ns, so the max frequency should be 1 / (2 * 6e-7), which gives
- roughly 830000Hz.
-
-Example:
-resolver@0 {
- compatible = "adi,ad2s90";
- reg = <0>;
- spi-max-frequency = <830000>;
- spi-cpol;
- spi-cpha;
-};
diff --git a/Documentation/devicetree/bindings/iio/resolver/adi,ad2s90.yaml b/Documentation/devicetree/bindings/iio/resolver/adi,ad2s90.yaml
new file mode 100644
index 000000000000..81e4bdfc17c4
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/resolver/adi,ad2s90.yaml
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/resolver/adi,ad2s90.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD2S90 Resolver-to-Digital Converter
+
+maintainers:
+ - Matheus Tavares <matheus.bernardino@usp.br>
+
+description: |
+ Datasheet: https://www.analog.com/en/products/ad2s90.html
+
+properties:
+ compatible:
+ const: adi,ad2s90
+
+ reg:
+ maxItems: 1
+
+ spi-max-frequency:
+ maximum: 830000
+ description: |
+ Chip's max frequency, as specified in its datasheet, is 2Mhz. But a 600ns
+ delay is expected between the application of a logic LO to CS and the
+ application of SCLK, as also specified. And since the delay is not
+ implemented in the spi code, to satisfy it, SCLK's period should be at
+ most 2 * 600ns, so the max frequency should be 1 / (2 * 6e-7), which gives
+ roughly 830000Hz.
+
+ spi-cpol: true
+
+ spi-cpha: true
+
+additionalProperties: false
+
+required:
+ - compatible
+ - reg
+
+dependencies:
+ spi-cpol: [ spi-cpha ]
+ spi-cpha: [ spi-cpol ]
+
+examples:
+ - |
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ resolver@0 {
+ compatible = "adi,ad2s90";
+ reg = <0>;
+ spi-max-frequency = <830000>;
+ spi-cpol;
+ spi-cpha;
+ };
+ };
+...
--
2.28.0
next prev parent reply other threads:[~2020-10-31 18:51 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-31 18:48 [PATCH 00/46] dt-bindings:iio: yet more txt to yam conversions Jonathan Cameron
2020-10-31 18:48 ` Jonathan Cameron [this message]
2020-10-31 18:48 ` [PATCH 02/46] dt-bindings:iio:potentiometer:adi,ad5272 yaml conversion Jonathan Cameron
2020-11-02 4:48 ` Phil Reid
2020-11-03 16:10 ` Rob Herring
2020-11-03 17:28 ` Jonathan Cameron
2020-11-04 0:39 ` Phil Reid
2020-11-04 3:12 ` Rob Herring
2020-11-04 4:53 ` Phil Reid
2020-11-09 2:56 ` Phil Reid
2020-11-22 16:35 ` Jonathan Cameron
2020-11-23 23:33 ` Phil Reid
2020-10-31 18:48 ` [PATCH 03/46] dt-bindings:iio:potentiometer:microchip,mcp4131 txt to " Jonathan Cameron
2020-11-02 16:19 ` Slawomir Stepien
2020-11-03 16:11 ` Rob Herring
2020-10-31 18:48 ` [PATCH 04/46] dt-bindings:iio:potentiometer:microchip,mcp41010 " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 05/46] dt-bindings:iio:impedance-analyzer:adi,ad5933 " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 06/46] dt-bindings:iio:samsung,sensorhub-rinato: " Jonathan Cameron
2020-11-22 16:43 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 07/46] dt-bindings:iio:health:ti,afe4403: txt to yaml binding Jonathan Cameron
2020-11-22 17:32 ` Jonathan Cameron
2020-11-28 16:15 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 08/46] dt-bindings:iio:health:ti,afe4404: txt to yaml conversion Jonathan Cameron
2020-11-28 16:24 ` Jonathan Cameron
2020-12-18 19:42 ` Rob Herring
2020-12-30 12:21 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 09/46] dt-bindings:iio:health:maxim,max30100: " Jonathan Cameron
2020-10-31 21:41 ` Matt Ranostay
2020-11-22 16:58 ` Jonathan Cameron
2020-11-22 17:24 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 10/46] dt-bindings:iio:health:maxim,max30102: " Jonathan Cameron
2020-10-31 21:38 ` Matt Ranostay
2020-11-22 17:29 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 11/46] dt-bindings:iio:imu:adi,adis16480: " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 12/46] dt-bindings:iio:imu:st,lsm6dsx: " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 13/46] dt-bindings:iio:light:avago,apds9300: " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 14/46] dt-bindings:iio:light:avago,apds9960: " Jonathan Cameron
2020-10-31 21:33 ` Matt Ranostay
2020-10-31 21:35 ` Matt Ranostay
2020-11-01 14:57 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 15/46] dt-bindings:iio:light:capella,cm36651: " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 16/46] dt-bindings:iio:light:sharp,gp2ap020a00f: " Jonathan Cameron
2020-11-22 17:42 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 17/46] dt-bindings:iio:light:maxim,max44009: " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 18/46] dt-bindings:iio:light:ti,opt3001: " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 19/46] dt-bindings:iio:light:upisemi,us51882: " Jonathan Cameron
2020-11-03 16:18 ` Rob Herring
2020-10-31 18:48 ` [PATCH 20/46] dt-bindings:iio:light:st,uvis25: txt to yaml conversion for this UV sensor Jonathan Cameron
2020-10-31 18:48 ` [PATCH 21/46] dt-bindings:iio:light:vishay,vcnl4035: txt to yaml conversion Jonathan Cameron
2020-11-22 17:52 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 22/46] dt-bindings:iio:light:st,vl6180: txt to yaml format conversion Jonathan Cameron
2020-11-01 15:26 ` Manivannan Sadhasivam
2020-10-31 18:48 ` [PATCH 23/46] dt-bindings:iio:magnetometer:fsl,mag3110: txt to yaml conversion Jonathan Cameron
2020-10-31 18:48 ` [PATCH 24/46] dt-bindings:iio:magnetometer:asahi-kasei,ak8974: txt to yaml format conversion Jonathan Cameron
2020-11-04 14:47 ` Linus Walleij
2020-11-08 15:55 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 25/46] dt-bindings:iio:magnetometer:bosch,bmc150_magn: txt to yaml conversion Jonathan Cameron
2020-10-31 18:48 ` [PATCH 26/46] dt-bindings:iio:magnetometer:honeywell,hmc5843: txt to yaml format conversion Jonathan Cameron
2020-10-31 18:48 ` [PATCH 27/46] dt-bindings:iio:magnetometer:pni,rm3100: txt to yaml conversion Jonathan Cameron
2020-10-31 18:48 ` [PATCH 28/46] dt-bindings:iio:adc:atmel,sama5d2-adc: " Jonathan Cameron
2020-11-22 18:07 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 29/46] dt-bindings:iio:adc:atmel,sama9260-adc: conversion to yaml from at91_adc.txt Jonathan Cameron
2020-11-13 9:22 ` Alexandre Belloni
2020-11-14 15:37 ` Jonathan Cameron
2020-11-22 18:09 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 30/46] dt-bindings:iio:adc:renesas,rcar-gyroadc: txt to yaml conversion Jonathan Cameron
2020-11-03 16:26 ` Rob Herring
2020-11-27 8:14 ` Geert Uytterhoeven
2020-10-31 18:48 ` [PATCH 31/46] dt-bindings:iio:adc:x-powers,axp209-adc: " Jonathan Cameron
2020-11-22 18:15 ` Jonathan Cameron
2020-11-23 3:02 ` Chen-Yu Tsai
2020-11-23 20:36 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 32/46] dt-bindings:iio:adc:brcm,iproc-static-adc: " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 33/46] dt-bindings:iio:adc:mediatek,mt2701-auxadc: rename and " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 34/46] dt-bindings:iio:adc:ti,palmas-gpadc: txt to yaml format conversion Jonathan Cameron
2020-11-22 18:20 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 35/46] dt-bindings:iio:adc:qcom,pm8018-adc: yaml conversion and rename Jonathan Cameron
2020-11-04 14:51 ` Linus Walleij
2020-10-31 18:48 ` [PATCH 36/46] dt-bindings:iio:adc:qcom,spmi-iadc: txt to yaml format conversion Jonathan Cameron
2020-11-22 18:25 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 37/46] dt-binding:iio:adc:ti,ads124s08: " Jonathan Cameron
2020-11-02 12:49 ` Dan Murphy
2020-11-08 16:59 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 38/46] dt-bindings:iio:dac:ad5592r: " Jonathan Cameron
2020-11-03 16:31 ` Rob Herring
2020-11-22 18:38 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 39/46] dt-bindings:iio:dac:ad5755: " Jonathan Cameron
2020-11-03 16:32 ` Rob Herring
2020-11-22 18:40 ` Jonathan Cameron
2021-02-21 16:33 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 40/46] dt-bindings:iio:accel:bosch,bma180: " Jonathan Cameron
2020-11-22 18:44 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 41/46] dt-bindings:iio:accel:kionix,kxcjk1013: " Jonathan Cameron
2020-10-31 18:48 ` [PATCH 42/46] dt-bindings:iio:accel:fsl,mma8452: txt to yaml conversion Jonathan Cameron
2020-11-03 16:34 ` Rob Herring
2020-11-22 18:50 ` Jonathan Cameron
2020-10-31 18:48 ` [PATCH 43/46] dt-bindings:iio:gyro:bosch,bmg180: txt to yaml format conversion Jonathan Cameron
2020-10-31 18:48 ` [PATCH 44/46] dt-bindings:iio:st,st-sensors: txt to yaml conversion Jonathan Cameron
2020-11-02 16:16 ` Denis CIOCCA
2020-10-31 18:48 ` [PATCH 45/46] dt-bindings:iio:frequency:adi,adf4350: txt to yaml format conversion Jonathan Cameron
2020-10-31 18:48 ` [PATCH 46/46] dt-bindings:iio:temperature: Drop generic binding file Jonathan Cameron
2020-11-03 16:38 ` [PATCH 00/46] dt-bindings:iio: yet more txt to yam conversions Rob Herring
2020-11-03 17:24 ` Jonathan Cameron
2020-11-22 18:59 ` Jonathan Cameron
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