linux-kernel - [PATCH v2 3/6] dt-bindings: input: cypress,tt21000

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Message-Id: <20230501113010.891786-4-mweigand@mweigand.net>
Date:   Mon,  1 May 2023 13:30:07 +0200
From:   Maximilian Weigand <mweigand@...igand.net>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     Maximilian Weigand <mweigand@...igand.net>,
        Alistair Francis <alistair@...stair23.me>
Subject: [PATCH v2 3/6] dt-bindings: input: cypress,tt21000 - fix interrupt type in dts example

Triggering the interrupt of the IRQ_TYPE_LEVEL_LOW type can lead to
probing issues with the device for the current driver (encountered on
the Pine64 PineNote). Basically the interrupt would be triggered before
certain commands were sent to the device, leading to a race between the
device responding fast enough and the irq handler fetching a data frame
from it. Actually all devices currently using the driver already use a
falling edge trigger.

Signed-off-by: Maximilian Weigand <mweigand@...igand.net>
Reviewed-by: Alistair Francis <alistair@...stair23.me>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
---
 .../devicetree/bindings/input/touchscreen/cypress,tt21000.yaml  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
index 1959ec394768..a77203c78d6e 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
@@ -83,7 +83,7 @@ examples:
             pinctrl-names = "default";
             pinctrl-0 = <&tp_reset_ds203>;
             interrupt-parent = <&pio>;
-            interrupts = <1 5 IRQ_TYPE_LEVEL_LOW>;
+            interrupts = <1 5 IRQ_TYPE_EDGE_FALLING>;
             reset-gpios = <&pio 7 1 GPIO_ACTIVE_LOW>;
             vdd-supply = <&reg_touch>;
 
-- 
2.39.2