linux-kernel - [PATCH] arm64: dts: ti: k3-pinctrl: Introduce Schmitt Trigger macros

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Message-ID: <20250627131332.2806026-1-alexander.sverdlin@siemens.com>
Date: Fri, 27 Jun 2025 15:13:23 +0200
From: "A. Sverdlin" <alexander.sverdlin@...mens.com>
To: devicetree@...r.kernel.org
Cc: Alexander Sverdlin <alexander.sverdlin@...mens.com>,
	Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: ti: k3-pinctrl: Introduce Schmitt Trigger macros

From: Alexander Sverdlin <alexander.sverdlin@...mens.com>

Introduce ST_DISABLE and ST_ENABLE macros so that they can be used in
conjunction with PIN_INPUT* macros, e.g. (PIN_INPUT | ST_ENABLE).

Note that K3 might have quite strict input slew rate requirements and
all inputs actually have ST enabled on reset, but AM62PX_IOPAD macro
will not preserve this power-on default config. Therefore ST_ENABLE
is encouraged in many situations, especially if the input is to be
used as IRQ trigger.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...mens.com>
---
 arch/arm64/boot/dts/ti/k3-pinctrl.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-pinctrl.h b/arch/arm64/boot/dts/ti/k3-pinctrl.h
index cac7cccc11121..3e371be7b8062 100644
--- a/arch/arm64/boot/dts/ti/k3-pinctrl.h
+++ b/arch/arm64/boot/dts/ti/k3-pinctrl.h
@@ -8,6 +8,7 @@
 #ifndef DTS_ARM64_TI_K3_PINCTRL_H
 #define DTS_ARM64_TI_K3_PINCTRL_H
 
+#define ST_EN_SHIFT		(14)
 #define PULLUDEN_SHIFT		(16)
 #define PULLTYPESEL_SHIFT	(17)
 #define RXACTIVE_SHIFT		(18)
@@ -44,6 +45,10 @@
 #define PIN_DEBOUNCE_CONF5	(5 << DEBOUNCE_SHIFT)
 #define PIN_DEBOUNCE_CONF6	(6 << DEBOUNCE_SHIFT)
 
+/* Schmitt trigger configuration */
+#define ST_DISABLE		(0 << ST_EN_SHIFT)
+#define ST_ENABLE		(1 << ST_EN_SHIFT)
+
 #define PIN_DS_FORCE_DISABLE		(0 << FORCE_DS_EN_SHIFT)
 #define PIN_DS_FORCE_ENABLE		(1 << FORCE_DS_EN_SHIFT)
 #define PIN_DS_IO_OVERRIDE_DISABLE	(0 << DS_IO_OVERRIDE_EN_SHIFT)
-- 
2.50.0