github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-27 16:44:58 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

arm64: dts: ti: k3-pinctrl: Enable Schmitt Trigger by default

Browse Source 
Switch Schmitt Trigger functions for PIN_INPUT* macros by default. This is
HW PoR configuration, the slew rate requirements without ST enabled are
pretty tough for these devices. We've noticed spurious GPIO interrupts even
with noise-free edges but not meeting slew rate requirements (3.3E+6 V/s
for 3.3v LVCMOS).

It's not obvious why one might want to disable the PoR-enabled ST on any
pin. Just enable it by default. As it's not possible to provide OR-able
macros to disable the ST, shall anyone require it, provide a set of
new macros with _NOST suffix.

Fixes: fe49f2d776 ("arm64: dts: ti: Use local header for pinctrl register values")
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Link: https://lore.kernel.org/r/20250701105437.3539924-1-alexander.sverdlin@siemens.com
[vigneshr@ti.com: Add Fixes tag]
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
This commit is contained in:
Alexander Sverdlin 2025-07-01 12:54:35 +02:00 committed by Vignesh Raghavendra
parent fefaa8d7f8
commit 5b27212788
1 changed files with 12 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/arm64/boot/dts/ti/k3-pinctrl.h
View File

@ -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)
@ -19,6 +20,10 @@
#define DS_PULLUD_EN_SHIFT (27)
#define DS_PULLTYPE_SEL_SHIFT (28)
/* Schmitt trigger configuration */
#define ST_DISABLE (0 << ST_EN_SHIFT)
#define ST_ENABLE (1 << ST_EN_SHIFT)
#define PULL_DISABLE (1 << PULLUDEN_SHIFT)
#define PULL_ENABLE (0 << PULLUDEN_SHIFT)
@ -32,9 +37,13 @@
#define PIN_OUTPUT (INPUT_DISABLE | PULL_DISABLE)
#define PIN_OUTPUT_PULLUP (INPUT_DISABLE | PULL_UP)
#define PIN_OUTPUT_PULLDOWN (INPUT_DISABLE | PULL_DOWN)
#define PIN_INPUT (INPUT_EN | PULL_DISABLE)
#define PIN_INPUT_PULLUP (INPUT_EN | PULL_UP)
#define PIN_INPUT_PULLDOWN (INPUT_EN | PULL_DOWN)
#define PIN_INPUT (INPUT_EN | ST_ENABLE | PULL_DISABLE)
#define PIN_INPUT_PULLUP (INPUT_EN | ST_ENABLE | PULL_UP)
#define PIN_INPUT_PULLDOWN (INPUT_EN | ST_ENABLE | PULL_DOWN)
/* Input configurations with Schmitt Trigger disabled */
#define PIN_INPUT_NOST (INPUT_EN | PULL_DISABLE)
#define PIN_INPUT_PULLUP_NOST (INPUT_EN | PULL_UP)
#define PIN_INPUT_PULLDOWN_NOST (INPUT_EN | PULL_DOWN)
#define PIN_DEBOUNCE_DISABLE (0 << DEBOUNCE_SHIFT)
#define PIN_DEBOUNCE_CONF1 (1 << DEBOUNCE_SHIFT)