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Subject[PATCH v8 1/2] dt-bindings: gpio: uniphier: add UniPhier GPIO binding
Date
This GPIO controller is used on UniPhier SoC family.

The vendor specific property "socionext,interrupt-ranges" is for
specifying interrupt mapping to the parent interrupt controller
because the mapping is not contiguous. It works like "ranges",
but transforms "interrupts" instead of "reg".

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Rob Herring <robh@kernel.org>
---

.../devicetree/bindings/gpio/gpio-uniphier.txt | 52 ++++++++++++++++++++++
MAINTAINERS | 1 +
include/dt-bindings/gpio/uniphier-gpio.h | 18 ++++++++
3 files changed, 71 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-uniphier.txt
create mode 100644 include/dt-bindings/gpio/uniphier-gpio.h

diff --git a/Documentation/devicetree/bindings/gpio/gpio-uniphier.txt b/Documentation/devicetree/bindings/gpio/gpio-uniphier.txt
new file mode 100644
index 0000000..fed9158
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-uniphier.txt
@@ -0,0 +1,52 @@
+UniPhier GPIO controller
+
+Required properties:
+- compatible: Should be "socionext,uniphier-gpio".
+- reg: Specifies offset and length of the register set for the device.
+- gpio-controller: Marks the device node as a GPIO controller.
+- #gpio-cells: Should be 2. The first cell is the pin number and the second
+ cell is used to specify optional parameters.
+- interrupt-parent: Specifies the parent interrupt controller.
+- interrupt-controller: Marks the device node as an interrupt controller.
+- #interrupt-cells: Should be 2. The first cell defines the interrupt number.
+ The second cell bits[3:0] is used to specify trigger type as follows:
+ 1 = low-to-high edge triggered
+ 2 = high-to-low edge triggered
+ 4 = active high level-sensitive
+ 8 = active low level-sensitive
+ Valid combinations are 1, 2, 3, 4, 8.
+- ngpios: Specifies the number of GPIO lines.
+- gpio-ranges: Mapping to pin controller pins (as described in gpio.txt)
+- socionext,interrupt-ranges: Specifies an interrupt number mapping between
+ this GPIO controller and its interrupt parent, in the form of arbitrary
+ number of <child-interrupt-base parent-interrupt-base length> triplets.
+
+Optional properties:
+- gpio-ranges-group-names: Used for named gpio ranges (as described in gpio.txt)
+
+Example:
+ gpio: gpio@55000000 {
+ compatible = "socionext,uniphier-gpio";
+ reg = <0x55000000 0x200>;
+ interrupt-parent = <&aidet>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ gpio-ranges = <&pinctrl 0 0 0>;
+ gpio-ranges-group-names = "gpio_range";
+ ngpios = <248>;
+ socionext,interrupt-ranges = <0 48 16>, <16 154 5>, <21 217 3>;
+ };
+
+Consumer Example:
+
+ sdhci0_pwrseq {
+ compatible = "mmc-pwrseq-emmc";
+ reset-gpios = <&gpio UNIPHIER_GPIO_PORT(29, 4) GPIO_ACTIVE_LOW>;
+ };
+
+Please note UNIPHIER_GPIO_PORT(29, 4) represents PORT294 in the SoC document.
+Unfortunately, only the one's place is octal in the port numbering. (That is,
+PORT 8, 9, 18, 19, 28, 29, ... are missing.) UNIPHIER_GPIO_PORT() is a helper
+macro to calculate 29 * 8 + 4.
diff --git a/MAINTAINERS b/MAINTAINERS
index caacc88..2474032 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2029,6 +2029,7 @@ M: Masahiro Yamada <yamada.masahiro@socionext.com>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
T: git git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-uniphier.git
S: Maintained
+F: Documentation/devicetree/bindings/gpio/gpio-uniphier.txt
F: arch/arm/boot/dts/uniphier*
F: arch/arm/include/asm/hardware/cache-uniphier.h
F: arch/arm/mach-uniphier/
diff --git a/include/dt-bindings/gpio/uniphier-gpio.h b/include/dt-bindings/gpio/uniphier-gpio.h
new file mode 100644
index 0000000..9f0ad17
--- /dev/null
+++ b/include/dt-bindings/gpio/uniphier-gpio.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2017 Socionext Inc.
+ * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
+ */
+
+#ifndef _DT_BINDINGS_GPIO_UNIPHIER_H
+#define _DT_BINDINGS_GPIO_UNIPHIER_H
+
+#define UNIPHIER_GPIO_LINES_PER_BANK 8
+
+#define UNIPHIER_GPIO_IRQ_OFFSET ((UNIPHIER_GPIO_LINES_PER_BANK) * 15)
+
+#define UNIPHIER_GPIO_PORT(bank, line) \
+ ((UNIPHIER_GPIO_LINES_PER_BANK) * (bank) + (line))
+
+#define UNIPHIER_GPIO_IRQ(n) ((UNIPHIER_GPIO_IRQ_OFFSET) + (n))
+
+#endif /* _DT_BINDINGS_GPIO_UNIPHIER_H */
--
2.7.4
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