pinctrl: sandbox: add sandbox pinctrl driver

This driver actually does nothing but test pinctrl uclass, and
demonstrate how things work.

To try this driver, uncomment /* #define DEBUG */ in the
drivers/pinctrl/pinctrl-sandbox.c, and debug messages will be
displayed.

  DRAM:  128 MiB
  sandbox pinmux: group = 1 (serial_a), function = 1 (serial)
  Using default environment

  In:    cros-ec-keyb
  Out:   lcd
  Err:   lcd
  Net:   Net Initialization Skipped
  eth0: eth@10002000, eth1: eth@80000000, eth5: eth@90000000
  => i2c dev 0
  Setting bus to 0
  sandbox pinmux: group = 0 (i2c), function = 0 (i2c)
  sandbox pinconf: group = 0 (i2c), param = 3, arg = 1

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/sandbox/dts/sandbox.dts

@@ -92,6 +92,8 @@
 		reg = <0 0>;
 		compatible = "sandbox,i2c";
 		clock-frequency = <400000>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_i2c0>;
 		eeprom@2c {
 			reg = <0x2c>;
 			compatible = "i2c-eeprom";
@@ -136,6 +138,21 @@
 		};
 	};
 
+	pinctrl {
+		compatible = "sandbox,pinctrl";
+
+		pinctrl_i2c0: i2c0 {
+			groups = "i2c";
+			function = "i2c";
+			bias-pull-up;
+		};
+
+		pinctrl_serial0: uart0 {
+			groups = "serial_a";
+			function = "serial";
+		};
+	};
+
 	spi@0 {
 		#address-cells = <1>;
 		#size-cells = <0>;
@@ -172,6 +189,8 @@
 	uart0: serial {
 		compatible = "sandbox,serial";
 		sandbox,text-colour = "cyan";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_serial0>;
 	};
 
 	usb@0 {

configs/sandbox_defconfig

@@ -36,6 +36,9 @@ CONFIG_DM_TPM=y
 CONFIG_TPM_TIS_SANDBOX=y
 CONFIG_SYS_I2C_SANDBOX=y
 CONFIG_SANDBOX_SPI=y
+CONFIG_PINCTRL=y
+CONFIG_PINCONF=y
+CONFIG_PINCTRL_SANDBOX=y
 CONFIG_SANDBOX_GPIO=y
 CONFIG_DM_PMIC=y
 CONFIG_DM_PMIC_SANDBOX=y

drivers/pinctrl/Kconfig

@@ -96,6 +96,14 @@ config SPL_PINCONF
 
 if PINCTRL || SPL_PINCTRL
 
+config PINCTRL_SANDBOX
+	bool "Sandbox pinctrl driver"
+	depends on SANDBOX
+	help
+	  This enables pinctrl driver for sandbox.  Currently, this driver
+	  actually does nothing but print debug messages when pinctrl
+	  operations are invoked.
+
 endif
 
 endmenu

drivers/pinctrl/Makefile

@@ -1,2 +1,4 @@
 obj-y					+= pinctrl-uclass.o
 obj-$(CONFIG_$(SPL_)PINCTRL_GENERIC)	+= pinctrl-generic.o
+
+obj-$(CONFIG_PINCTRL_SANDBOX)	+= pinctrl-sandbox.o

drivers/pinctrl/pinctrl-sandbox.c

@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2015  Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/* #define DEBUG */
+
+#include <common.h>
+#include <dm/device.h>
+#include <dm/pinctrl.h>
+
+static const char * const sandbox_pins[] = {
+	"SCL",
+	"SDA",
+	"TX",
+	"RX",
+};
+
+static const char * const sandbox_groups[] = {
+	"i2c",
+	"serial_a",
+	"serial_b",
+	"spi",
+};
+
+static const char * const sandbox_functions[] = {
+	"i2c",
+	"serial",
+	"spi",
+};
+
+static const struct pinconf_param sandbox_conf_params[] = {
+	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
+	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
+	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
+	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
+	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
+	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
+	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
+	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
+	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
+	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
+	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
+};
+
+static int sandbox_get_pins_count(struct udevice *dev)
+{
+	return ARRAY_SIZE(sandbox_pins);
+}
+
+static const char *sandbox_get_pin_name(struct udevice *dev, unsigned selector)
+{
+	return sandbox_pins[selector];
+}
+
+static int sandbox_get_groups_count(struct udevice *dev)
+{
+	return ARRAY_SIZE(sandbox_groups);
+}
+
+static const char *sandbox_get_group_name(struct udevice *dev,
+					  unsigned selector)
+{
+	return sandbox_groups[selector];
+}
+
+static int sandbox_get_functions_count(struct udevice *dev)
+{
+	return ARRAY_SIZE(sandbox_functions);
+}
+
+static const char *sandbox_get_function_name(struct udevice *dev,
+					     unsigned selector)
+{
+	return sandbox_functions[selector];
+}
+
+static int sandbox_pinmux_set(struct udevice *dev, unsigned pin_selector,
+			      unsigned func_selector)
+{
+	debug("sandbox pinmux: pin = %d (%s), function = %d (%s)\n",
+	      pin_selector, sandbox_get_pin_name(dev, pin_selector),
+	      func_selector, sandbox_get_function_name(dev, func_selector));
+
+	return 0;
+}
+
+static int sandbox_pinmux_group_set(struct udevice *dev,
+				    unsigned group_selector,
+				    unsigned func_selector)
+{
+	debug("sandbox pinmux: group = %d (%s), function = %d (%s)\n",
+	      group_selector, sandbox_get_group_name(dev, group_selector),
+	      func_selector, sandbox_get_function_name(dev, func_selector));
+
+	return 0;
+}
+
+static int sandbox_pinconf_set(struct udevice *dev, unsigned pin_selector,
+			       unsigned param, unsigned argument)
+{
+	debug("sandbox pinconf: pin = %d (%s), param = %d, arg = %d\n",
+	      pin_selector, sandbox_get_pin_name(dev, pin_selector),
+	      param, argument);
+
+	return 0;
+}
+
+static int sandbox_pinconf_group_set(struct udevice *dev,
+				     unsigned group_selector,
+				     unsigned param, unsigned argument)
+{
+	debug("sandbox pinconf: group = %d (%s), param = %d, arg = %d\n",
+	      group_selector, sandbox_get_group_name(dev, group_selector),
+	      param, argument);
+
+	return 0;
+}
+
+const struct pinctrl_ops sandbox_pinctrl_ops = {
+	.get_pins_count = sandbox_get_pins_count,
+	.get_pin_name = sandbox_get_pin_name,
+	.get_groups_count = sandbox_get_groups_count,
+	.get_group_name = sandbox_get_group_name,
+	.get_functions_count = sandbox_get_functions_count,
+	.get_function_name = sandbox_get_function_name,
+	.pinmux_set = sandbox_pinmux_set,
+	.pinmux_group_set = sandbox_pinmux_group_set,
+	.pinconf_num_params = ARRAY_SIZE(sandbox_conf_params),
+	.pinconf_params = sandbox_conf_params,
+	.pinconf_set = sandbox_pinconf_set,
+	.pinconf_group_set = sandbox_pinconf_group_set,
+	.set_state = pinctrl_generic_set_state,
+};
+
+static const struct udevice_id sandbox_pinctrl_match[] = {
+	{ .compatible = "sandbox,pinctrl" },
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(sandbox_pinctrl) = {
+	.name = "sandbox_pinctrl",
+	.id = UCLASS_PINCTRL,
+	.of_match = sandbox_pinctrl_match,
+	.ops = &sandbox_pinctrl_ops,
+};