From: "Lin, Meng-Bo" <linmengbo0689@protonmail.com>
To: linux-input@vger.kernel.org
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
Alistair Francis <alistair@alistair23.me>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] dt-bindings: input: cyttsp5: document vddio-supply
Date: Thu, 17 Nov 2022 19:05:32 +0000 [thread overview]
Message-ID: <20221117190507.87535-2-linmengbo0689@protonmail.com> (raw)
In-Reply-To: <20221117190507.87535-1-linmengbo0689@protonmail.com>
The Samsung touchscreen controllers are often used with external pull-up
for the interrupt line and the I2C lines, so we might need to enable
a regulator to bring the lines into usable state. Otherwise, this might
cause spurious interrupts and reading from I2C will fail.
Document support for a "vddio-supply" that is enabled by the cyttsp5
driver so that the regulator gets enabled when needed.
Signed-off-by: Lin, Meng-Bo <linmengbo0689@protonmail.com>
---
.../devicetree/bindings/input/touchscreen/cypress,tt21000.yaml | 3 +++
1 file changed, 3 insertions(+)
diff --git a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
index 1959ec394768..869a9bdd962f 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
@@ -34,6 +34,9 @@ properties:
vdd-supply:
description: Regulator for voltage.
+ vddio-supply:
+ description: Optional Regulator for I/O voltage.
+
reset-gpios:
maxItems: 1
--
2.30.2
next prev parent reply other threads:[~2022-11-17 19:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-17 19:05 [PATCH 0/2] Input: cyttsp5 - add vddio regulator Lin, Meng-Bo
2022-11-17 19:05 ` Lin, Meng-Bo [this message]
2022-11-18 8:11 ` [PATCH 1/2] dt-bindings: input: cyttsp5: document vddio-supply Krzysztof Kozlowski
2022-11-18 23:27 ` Alistair
2022-11-17 19:05 ` [PATCH 2/2] Input: cyttsp5 - add vddio regulator Lin, Meng-Bo
2022-11-17 21:16 ` Christophe JAILLET
2022-11-17 22:15 ` Dmitry Torokhov
2022-11-17 22:17 ` Dmitry Torokhov
2022-11-17 22:39 ` Lin, Meng-Bo
2022-11-18 23:29 ` Alistair
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