linux-kernel - Re: [PATCH v3 4/4] pinctrl: samsung: Add filter selection support for alive bank on gs101

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Message-ID: <67ad046453d722ffd80370d45f4f515a432ec327.camel@linaro.org>
Date: Thu, 06 Mar 2025 21:24:40 +0000
From: André Draszik <andre.draszik@...aro.org>
To: Peter Griffin <peter.griffin@...aro.org>, Krzysztof Kozlowski	
 <krzk@...nel.org>, Sylwester Nawrocki <s.nawrocki@...sung.com>, Alim Akhtar
	 <alim.akhtar@...sung.com>, Linus Walleij <linus.walleij@...aro.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	tudor.ambarus@...aro.org, willmcvicker@...gle.com,
 semen.protsenko@...aro.org, 	kernel-team@...roid.com,
 jaewon02.kim@...sung.com
Subject: Re: [PATCH v3 4/4] pinctrl: samsung: Add filter selection support
 for alive bank on gs101

On Thu, 2025-03-06 at 20:42 +0000, Peter Griffin wrote:
> Newer Exynos based SoCs have a filter selection bitfield in the filter
> configuration registers on alive bank pins. This allows the selection of
> a digital or analog delay filter for each pin. Add support for selecting
> and enabling the filter.
> 
> On suspend we set the analog filter to all pins in the bank (as the
> digital filter relies on a clock). On resume the digital filter is
> reapplied to all pins in the bank. The digital filter is working via
> a clock and has an adjustable filter delay flt_width bitfield, whereas
> the analog filter uses a fixed delay.
> 
> The filter determines to what extent signal fluctuations received through
> the pad are considered glitches.
> 
> The code path can be exercised using
> echo mem > /sys/power/state
> And then wake the device using a eint gpio
> 
> Signed-off-by: Peter Griffin <peter.griffin@...aro.org>

Reviewed-by: André Draszik <andre.draszik@...aro.org>