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From: Igor Reznichenko <igor@reznichenko.net>
To: krzk@kernel.org
Cc: conor+dt@kernel.org, corbet@lwn.net,
	david.hunter.linux@gmail.com, devicetree@vger.kernel.org,
	krzk+dt@kernel.org, linux-doc@vger.kernel.org,
	linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux@roeck-us.net, robh@kernel.org, skhan@linuxfoundation.org
Subject: Re: [PATCH v3 1/2] dt-bindings: hwmon: ST TSC1641 power monitor
Date: Tue,  4 Nov 2025 08:30:48 -0800	[thread overview]
Message-ID: <20251104163048.1130482-1-igor@reznichenko.net> (raw)
In-Reply-To: <20251104-ruddy-tuna-of-efficiency-3321d3@kuoka>

>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/interrupt-controller/irq.h>
>> +
>> +    i2c {
>> +        #address-cells = <1>;
>> +        #size-cells = <0>;
>> +
>> +        power-sensor@40 {
>> +            compatible = "st,tsc1641";
>> +            reg = <0x40>;
>> +            interrupt-parent = <&gpio1>;
>> +            interrupts = <1 IRQ_TYPE_LEVEL_LOW>; /* Polarity board dependent */
>> +            shunt-resistor-micro-ohms = <1000>;
>> +            st,alert-polarity-active-high;
>
>That's wrong IMO. Either you use it as SMBus alert or as CPU interrupt.
>If you use as CPU interrupt, then the flag in "interrupts" defines what
>is the level of this interrupt. That flag is a combination of both
>CPU/SoC side and any inverters on the device. And actually you wrote it
>already - "Polarity board dependent" - so why do you:
>1. Provide polarity twice
>2. Provide inconsistent values - alert interrupt is level low, but
>alert interrupt is also active (level) high. So level low or level high?

I tried to illustrate both in one example, but I can see how this is confusing.
Will it work if I split the interrupt part into separate example?

Thanks, Igor

  reply	other threads:[~2025-11-04 16:30 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-11-04  0:33 [PATCH v3 0/2] hwmon: Add TSC1641 I2C power monitor driver Igor Reznichenko
2025-11-04  0:33 ` [PATCH v3 1/2] dt-bindings: hwmon: ST TSC1641 power monitor Igor Reznichenko
2025-11-04  9:51   ` Krzysztof Kozlowski
2025-11-04 16:30     ` Igor Reznichenko [this message]
2025-11-05  6:56       ` Krzysztof Kozlowski
2025-11-04  0:33 ` [PATCH v3 2/2] hwmon: Add TSC1641 I2C power monitor driver Igor Reznichenko
2025-11-04  2:27   ` Guenter Roeck

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