From: Dmitry Osipenko <digetx@gmail.com>
To: Nick Dyer <nick@shmanahar.org>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Linus Walleij <linus.walleij@linaro.org>,
Jiada Wang <jiada_wang@mentor.com>
Cc: linux-input@vger.kernel.org, devicetree@vger.kernel.org,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v5 1/3] dt-bindings: input: atmel_mxt_ts: Document atmel,wakeup-method and WAKE line GPIO
Date: Tue, 2 Mar 2021 13:15:54 +0300 [thread overview]
Message-ID: <20210302101556.7150-2-digetx@gmail.com> (raw)
In-Reply-To: <20210302101556.7150-1-digetx@gmail.com>
Some Atmel touchscreen controllers have a WAKE line that needs to be
asserted low in order to wake up controller from a deep sleep. Document
the wakeup methods and the new GPIO properties.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
.../bindings/input/atmel,maxtouch.yaml | 29 +++++++++++++++++++
include/dt-bindings/input/atmel-maxtouch.h | 10 +++++++
2 files changed, 39 insertions(+)
create mode 100644 include/dt-bindings/input/atmel-maxtouch.h
diff --git a/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml b/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml
index 8c6418f76e94..e6b03a1e7c30 100644
--- a/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml
+++ b/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml
@@ -39,6 +39,13 @@ properties:
(active low). The line must be flagged with
GPIO_ACTIVE_LOW.
+ wake-gpios:
+ maxItems: 1
+ description:
+ Optional GPIO specifier for the touchscreen's wake pin
+ (active low). The line must be flagged with
+ GPIO_ACTIVE_LOW.
+
linux,gpio-keymap:
$ref: /schemas/types.yaml#/definitions/uint32-array
description: |
@@ -53,6 +60,26 @@ properties:
or experiment to determine which bit corresponds to which input. Use
KEY_RESERVED for unused padding values.
+ atmel,wakeup-method:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: |
+ The WAKE line is an active-low input that is used to wake up the touch
+ controller from deep-sleep mode before communication with the controller
+ could be started. This optional feature used to minimize current
+ consumption when the controller is in deep sleep mode. This feature is
+ relevant only to some controller families, like mXT1386 controller for
+ example.
+
+ The WAKE pin can be connected in one of the following ways:
+ 1) left permanently low
+ 2) connected to the I2C-compatible SCL pin
+ 3) connected to a GPIO pin on the host
+ enum:
+ - 0 # ATMEL_MXT_WAKEUP_NONE
+ - 1 # ATMEL_MXT_WAKEUP_I2C_SCL
+ - 2 # ATMEL_MXT_WAKEUP_GPIO
+ default: 0
+
required:
- compatible
- reg
@@ -63,6 +90,7 @@ additionalProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
+ #include <dt-bindings/input/atmel-maxtouch.h>
#include <dt-bindings/gpio/gpio.h>
i2c {
#address-cells = <1>;
@@ -75,6 +103,7 @@ examples:
reset-gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
vdda-supply = <&ab8500_ldo_aux2_reg>;
vdd-supply = <&ab8500_ldo_aux5_reg>;
+ atmel,wakeup-method = <ATMEL_MXT_WAKEUP_I2C_SCL>;
};
};
diff --git a/include/dt-bindings/input/atmel-maxtouch.h b/include/dt-bindings/input/atmel-maxtouch.h
new file mode 100644
index 000000000000..7345ab32224d
--- /dev/null
+++ b/include/dt-bindings/input/atmel-maxtouch.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef _DT_BINDINGS_ATMEL_MAXTOUCH_H
+#define _DT_BINDINGS_ATMEL_MAXTOUCH_H
+
+#define ATMEL_MXT_WAKEUP_NONE 0
+#define ATMEL_MXT_WAKEUP_I2C_SCL 1
+#define ATMEL_MXT_WAKEUP_GPIO 2
+
+#endif /* _DT_BINDINGS_ATMEL_MAXTOUCH_H */
--
2.29.2
next prev parent reply other threads:[~2021-03-02 10:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 10:15 [PATCH v5 0/3] Support wakeup methods of Atmel maXTouch controllers Dmitry Osipenko
2021-03-02 10:15 ` Dmitry Osipenko [this message]
2021-03-02 10:19 ` [PATCH v5 1/3] dt-bindings: input: atmel_mxt_ts: Document atmel,wakeup-method and WAKE line GPIO Dmitry Osipenko
2021-03-02 10:15 ` [PATCH v5 2/3] Input: atmel_mxt_ts - support wakeup methods Dmitry Osipenko
2021-03-02 10:15 ` [PATCH v5 3/3] ARM: tegra: acer-a500: Add atmel,wakeup-method property Dmitry Osipenko
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