gpio: sandbox: cleanup binding support

Cleanup binding support, use the generic binding by default
(test u-class gpio_xlate_offs_flags function) and add
specific binding for added value.
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

arch/sandbox/dts/test.dts

 /dts-v1/;
 
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/gpio/sandbox-gpio.h>
+
 / {
 	model = "sandbox";
 	compatible = "sandbox";
@@ -86,11 +89,14 @@
 		ping-expect = <0>;
 		ping-add = <0>;
 		u-boot,dm-pre-reloc;
-		test-gpios = <&gpio_a 1>, <&gpio_a 4>, <&gpio_b 5 0 3 2 1>,
+		test-gpios = <&gpio_a 1>, <&gpio_a 4>,
+			<&gpio_b 5 GPIO_ACTIVE_HIGH 3 2 1>,
 			<0>, <&gpio_a 12>;
-		test2-gpios = <&gpio_a 1>, <&gpio_a 4>, <&gpio_b 6 1 3 2 1>,
-			<&gpio_b 7 2 3 2 1>, <&gpio_b 8 4 3 2 1>,
-			<&gpio_b 9 0xc 3 2 1>;
+		test2-gpios = <&gpio_a 1>, <&gpio_a 4>,
+			<&gpio_b 6 GPIO_ACTIVE_LOW 3 2 1>,
+			<&gpio_b 7 GPIO_IN 3 2 1>,
+			<&gpio_b 8 GPIO_OUT 3 2 1>,
+			<&gpio_b 9 (GPIO_OUT|GPIO_OUT_ACTIVE) 3 2 1>;
 		int-value = <1234>;
 		uint-value = <(-1234)>;
 		int64-value = /bits/ 64 <0x1111222233334444>;

drivers/gpio/sandbox.c

@@ -10,6 +10,7 @@
 #include <asm/gpio.h>
 #include <dm/of.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/gpio/sandbox-gpio.h>
 
 /* Flags for each GPIO */
 #define GPIOF_OUTPUT	(1 << 0)	/* Currently set as an output */
@@ -136,13 +137,15 @@ static int sb_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
 	desc->offset = args->args[0];
 	if (args->args_count < 2)
 		return 0;
-	if (args->args[1] & GPIO_ACTIVE_LOW)
-		desc->flags |= GPIOD_ACTIVE_LOW;
-	if (args->args[1] & 2)
+	/* treat generic binding with gpio uclass */
+	gpio_xlate_offs_flags(dev, desc, args);
+
+	/* sandbox test specific, not defined in gpio.h */
+	if (args->args[1] & GPIO_IN)
 		desc->flags |= GPIOD_IS_IN;
-	if (args->args[1] & 4)
+	if (args->args[1] & GPIO_OUT)
 		desc->flags |= GPIOD_IS_OUT;
-	if (args->args[1] & 8)
+	if (args->args[1] & GPIO_OUT_ACTIVE)
 		desc->flags |= GPIOD_IS_OUT_ACTIVE;
 
 	return 0;

include/dt-bindings/gpio/sandbox-gpio.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This header provides constants for binding sandbox,gpio
+ *
+ */
+#ifndef _DT_BINDINGS_GPIO_SANDBOX_GPIO_H
+#define _DT_BINDINGS_GPIO_SANDBOX_GPIO_H
+
+/*
+ * Add a specific binding for sandbox gpio.
+ * The value need to be after the generic defines of
+ * dt-bindings/gpio/gpio.h
+ */
+
+/* Bit 16 express GPIO input mode */
+#define GPIO_IN			0x10000
+
+/* Bit 17 express GPIO output mode */
+#define GPIO_OUT		0x20000
+
+/* Bit 18 express GPIO output is active */
+#define GPIO_OUT_ACTIVE		0x40000
+
+#endif