From: Andy Shevchenko <andriy.shevchenko@intel.com>
To: Zhu Jun <zhujun2@cmss.chinamobile.com>
Cc: jic23@kernel.org, dlechner@baylibre.com, nuno.sa@analog.com,
crofts@kernel.org, linux-iio@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] iio: temperature: mcp9600: Bound thresholds before scaling
Date: Wed, 11 Nov 2026 16:42:44 +0200 [thread overview]
Message-ID: <avR-5DNJ7_xfyH61@ashevche-desk.local> (raw)
In-Reply-To: <20261111030538.10565-1-zhujun2@cmss.chinamobile.com>
On Wed, Nov 11, 2026 at 11:05:38AM +0800, Zhu Jun wrote:
> mcp9600_write_thresh() multiplies the integer part by 1000000 before
> clamping to the supported temperature range. The multiplication can
> overflow int, so a request such as 3000 degrees can select the lower
> threshold instead of the upper threshold.
>
> Clamp the integer part to the hot-junction range before scaling. Keep
> the existing final clamp for fractional values and the narrower cold-
> junction range.
...
> + val = clamp_val(val, MCP9600_MIN_TEMP_HOT_JUNCTION_MICRO / (int)MICRO,
Btw, why do we need to use _val() variant of clamp*()?
> + MCP9600_MAX_TEMP_HOT_JUNCTION_MICRO / (int)MICRO);
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2026-11-11 14:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-11 3:05 Zhu Jun
2026-11-11 14:42 ` Andy Shevchenko [this message]
2026-11-11 3:42 Zhu Jun
2026-11-11 14:43 ` Andy Shevchenko
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