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Date: Thu, 20 Oct 2022 23:13:56 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Ibrahim Tilki <Ibrahim.Tilki@...log.com>
Cc: a.zummo@...ertech.it, jdelvare@...e.com, linux@...ck-us.net,
robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
Zeynep Arslanbenzer <Zeynep.Arslanbenzer@...log.com>
Subject: Re: [PATCH 2/2] dt-bindings: rtc: add bindings for max313xx RTCs
On 19/10/2022 16:39:10+0300, Ibrahim Tilki wrote:
> Devicetree binding documentation for Analog Devices MAX313XX RTCs
>
> Signed-off-by: Ibrahim Tilki <Ibrahim.Tilki@...log.com>
> Signed-off-by: Zeynep Arslanbenzer <Zeynep.Arslanbenzer@...log.com>
> ---
> .../devicetree/bindings/rtc/adi,max313xx.yaml | 163 ++++++++++++++++++
> 1 file changed, 163 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/rtc/adi,max313xx.yaml
>
> diff --git a/Documentation/devicetree/bindings/rtc/adi,max313xx.yaml b/Documentation/devicetree/bindings/rtc/adi,max313xx.yaml
> new file mode 100644
> index 000000000..1aa491799
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/adi,max313xx.yaml
> @@ -0,0 +1,163 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2022 Analog Devices Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/rtc/adi,max313xx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices MAX313XX series I2C RTC driver
> +
> +maintainers:
> + - Ibrahim Tilki <Ibrahim.Tilki@...log.com>
> + - Zeynep Arslanbenzer <Zeynep.Arslanbenzer@...log.com>
> +
> +description: Bindings for the Analog Devices MAX313XX series RTCs.
> +
> +properties:
> + compatible:
> + enum:
> + - adi,max31328
> + - adi,max31329
> + - adi,max31331
> + - adi,max31334
> + - adi,max31341
> + - adi,max31342
> + - adi,max31343
> +
> + reg:
> + description: I2C address of the RTC
> + items:
> + - enum: [0x68, 0x69]
> +
> + interrupts:
> + minItems: 1
> + maxItems: 2
> +
> + interrupt-names:
> + description: |
> + Name of the interrupt pin of the RTC used for IRQ. Not required for
> + RTCs that only have single interrupt pin available. Some of the RTCs
> + share interrupt pins with clock input/output pins.
> + minItems: 1
> + items:
> + - enum: [INTA, INTB]
> + - enum: [INTA, INTB]
> +
I don't think this is right, what this is doing is essentially pinmuxing
interrupts versus clocks. What happens if you want INTB but this goes
directly to a PMIC instead of the SoC?
It is not something you can express with your current bindings.
> + "#clock-cells":
> + description: |
> + RTC can be used as a clock source through its clock output pin when
> + supplied.
> + const: 0
> +
> + clocks:
> + description: |
> + RTC uses this clock for clock input when supplied. Clock has to provide
> + one of these four frequencies: 1Hz, 50Hz, 60Hz or 32.768kHz.
> + maxItems: 1
> +
> + trickle-diode-disable: true
> +
> + trickle-resistor-ohms:
> + description: Enables trickle charger with specified resistor value.
> + enum: [3000, 6000, 11000]
> +
> + wakeup-source: true
> +
> +additionalProperties: false
> +
> +allOf:
> + - $ref: rtc.yaml#
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - adi,max31328
> + - adi,max31342
> +
> + then:
> + properties:
> + trickle-diode-disable: false
> + trickle-resistor-ohms: false
> +
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - adi,max31328
> + - adi,max31331
> + - adi,max31334
> + - adi,max31343
> +
> + then:
> + properties:
> + clocks: false
> +
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - adi,max31341
> + - adi,max31342
> +
> + then:
> + properties:
> + reg:
> + items:
> + - const: 0x69
> +
> + else:
> + properties:
> + reg:
> + items:
> + - const: 0x68
> +
> +required:
> + - compatible
> + - reg
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/irq.h>
> + i2c {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + rtc@68 {
> + reg = <0x68>;
> + compatible = "adi,max31329";
> + clocks = <&clkin>;
> + interrupt-parent = <&gpio>;
> + interrupts = <26 IRQ_TYPE_EDGE_FALLING>;
> + interrupt-names = "INTB";
> + };
> + };
> + - |
> + #include <dt-bindings/interrupt-controller/irq.h>
> + i2c {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + rtc@68 {
> + reg = <0x68>;
> + compatible = "adi,max31331";
> + #clock-cells = <0>;
> + interrupt-parent = <&gpio>;
> + interrupts = <25 IRQ_TYPE_EDGE_FALLING>, <26 IRQ_TYPE_EDGE_FALLING>;
> + interrupt-names = "INTA", "INTB";
> + };
> + };
> + - |
> + i2c {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + rtc@69 {
> + reg = <0x69>;
> + compatible = "adi,max31341";
> + #clock-cells = <0>;
> + clocks = <&clkin>;
> + };
> + };
> --
> 2.25.1
>
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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