From: "André Draszik" <andre.draszik@linaro.org>
To: Peter Griffin <peter.griffin@linaro.org>,
Krzysztof Kozlowski <krzk@kernel.org>,
Sylwester Nawrocki <s.nawrocki@samsung.com>,
Alim Akhtar <alim.akhtar@samsung.com>,
Linus Walleij <linus.walleij@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-gpio@vger.kernel.org,
linux-kernel@vger.kernel.org, tudor.ambarus@linaro.org,
willmcvicker@google.com, semen.protsenko@linaro.org,
kernel-team@android.com, jaewon02.kim@samsung.com
Subject: Re: [PATCH v3 4/4] pinctrl: samsung: Add filter selection support for alive bank on gs101
Date: Thu, 06 Mar 2025 21:24:40 +0000 [thread overview]
Message-ID: <67ad046453d722ffd80370d45f4f515a432ec327.camel@linaro.org> (raw)
In-Reply-To: <20250306-pinctrl-fltcon-suspend-v3-4-f9ab4ff6a24e@linaro.org>
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@linaro.org>
Reviewed-by: André Draszik <andre.draszik@linaro.org>
prev parent reply other threads:[~2025-03-06 21:24 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-06 20:42 [PATCH v3 0/4] samsung: pinctrl: Add support for eint_fltcon_offset and filter selection on gs101 Peter Griffin
2025-03-06 20:42 ` [PATCH v3 1/4] pinctrl: samsung: add support for eint_fltcon_offset Peter Griffin
2025-03-06 20:42 ` [PATCH v3 2/4] pinctrl: samsung: add dedicated SoC eint suspend/resume callbacks Peter Griffin
2025-03-06 21:15 ` André Draszik
2025-03-06 21:29 ` André Draszik
2025-03-06 20:42 ` [PATCH v3 3/4] pinctrl: samsung: add gs101 specific " Peter Griffin
2025-03-06 21:25 ` André Draszik
2025-03-06 20:42 ` [PATCH v3 4/4] pinctrl: samsung: Add filter selection support for alive bank on gs101 Peter Griffin
2025-03-06 21:24 ` André Draszik [this message]
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