6.6-stable review patch. If anyone has any objections, please let me know.
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From: Alexander Sverdlin alexander.sverdlin@siemens.com
commit 5b272127884bded21576a6ddceca13725a351c63 upstream.
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: fe49f2d776f7 ("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@siemen... [vigneshr@ti.com: Add Fixes tag] Signed-off-by: Vignesh Raghavendra vigneshr@ti.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm64/boot/dts/ti/k3-pinctrl.h | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-)
--- a/arch/arm64/boot/dts/ti/k3-pinctrl.h +++ b/arch/arm64/boot/dts/ti/k3-pinctrl.h @@ -8,11 +8,16 @@ #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) #define DEBOUNCE_SHIFT (11)
+/* 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)
@@ -26,9 +31,13 @@ #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)