pinctrl: bcm6838: add pinctrl support

Add pinctrl support for broadcom bcm6838 SoC.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>

doc/device-tree-bindings/pinctrl/bcm6838-pinctrl.txt

@@ -0,0 +1,35 @@
+* broadcom bcm6838 pinctrl
+
+Required properties for the pinctrl driver:
+- compatible:	   "brcm,bcm6838-pinctrl"
+- regmap: 		   specify the gpio test port syscon
+- brcm,pins-count:      the number of pin
+- brcm,functions-count: the number of function
+
+Please refer to pinctrl-bindings.txt in this directory for details of the
+common pinctrl bindings used by client devices.
+
+Example:
+
+		gpio_test_port: syscon@14e00294 {
+			compatible = "syscon";
+			reg = <0x14e00294 0x1c>;
+		};
+
+		pinctrl: pinctrl {
+			compatible = "brcm,bcm6838-pinctrl";
+			regmap = <&gpio_test_port>;
+			brcm,pins-count = <74>;
+			brcm,functions-count = <8>;
+
+			usb0: usb0 {
+				usb0_pwrflt {
+					pins = "69";
+					function = "1";
+				};
+				usb0_pwron {
+					pins = "70";
+					function = "1";
+				};
+			};
+		};

drivers/pinctrl/broadcom/Kconfig

@@ -5,3 +5,11 @@ config PINCTRL_BCM283X
 	help
 	   Support pin multiplexing and pin configuration control on
 	   Broadcom's 283x family of SoCs.
+
+config PINCTRL_BCM6838
+	depends on ARCH_BMIPS && PINCTRL_FULL && OF_CONTROL
+	default y
+	bool "Broadcom 6838 family pin control driver"
+	help
+	   Support pin multiplexing and pin configuration control on
+	   Broadcom's 6838 family of SoCs.

drivers/pinctrl/broadcom/Makefile

@@ -5,3 +5,4 @@
 # https://spdx.org/licenses
 
 obj-$(CONFIG_PINCTRL_BCM283X) += pinctrl-bcm283x.o
+obj-$(CONFIG_PINCTRL_BCM6838) += pinctrl-bcm6838.o

drivers/pinctrl/broadcom/pinctrl-bcm6838.c

@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <common.h>
+#include <dm.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <dm/pinctrl.h>
+
+#define BCM6838_CMD_LOAD_MUX            0x21
+
+#define BCM6838_FUNC_OFFS               12
+#define BCM6838_FUNC_MASK               (0x37 << BCM6838_FUNC_OFFS)
+#define BCM6838_PIN_OFFS                 0
+#define BCM6838_PIN_MASK                (0xfff << BCM6838_PIN_OFFS)
+
+#define BCM6838_MAX_PIN_NAME_LEN         8
+static char bcm6838_pin_name[BCM6838_MAX_PIN_NAME_LEN];
+
+#define BCM6838_MAX_FUNC_NAME_LEN        8
+static char bcm6838_func_name[BCM6838_MAX_FUNC_NAME_LEN];
+
+struct bcm6838_test_port_hw {
+	unsigned long port_blk_data1;
+	unsigned long port_blk_data2;
+	unsigned long port_command;
+};
+
+static const struct bcm6838_test_port_hw bcm6838_hw = {
+	.port_blk_data1 = 0x10,
+	.port_blk_data2 = 0x14,
+	.port_command   = 0x18
+};
+
+struct bcm6838_pinctrl_priv {
+	const struct bcm6838_test_port_hw *hw;
+	struct regmap *regmap;
+	u32 pins_count;
+	u32 functions_count;
+};
+
+int bcm6838_pinctrl_get_pins_count(struct udevice *dev)
+{
+	struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
+
+	return priv->pins_count;
+}
+
+const char *bcm6838_pinctrl_get_pin_name(struct udevice *dev,
+					 unsigned int selector)
+{
+	snprintf(bcm6838_pin_name, BCM6838_MAX_PIN_NAME_LEN, "%u", selector);
+	return bcm6838_pin_name;
+}
+
+int bcm6838_pinctrl_get_functions_count(struct udevice *dev)
+{
+	struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
+
+	return priv->functions_count;
+}
+
+const char *bcm6838_pinctrl_get_function_name(struct udevice *dev,
+					      unsigned int selector)
+{
+	snprintf(bcm6838_func_name, BCM6838_MAX_FUNC_NAME_LEN, "%u", selector);
+	return bcm6838_func_name;
+}
+
+int bcm6838_pinctrl_pinmux_set(struct udevice *dev,
+			       unsigned int pin_selector,
+			       unsigned int func_selector)
+{
+	struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
+	const struct bcm6838_test_port_hw *hw = priv->hw;
+	unsigned int data;
+
+	regmap_write(priv->regmap, hw->port_blk_data1, 0);
+	data = (func_selector << BCM6838_FUNC_OFFS) & BCM6838_FUNC_MASK;
+	data |= (pin_selector << BCM6838_PIN_OFFS) & BCM6838_PIN_MASK;
+	regmap_write(priv->regmap, hw->port_blk_data2, data);
+	regmap_write(priv->regmap, hw->port_command, BCM6838_CMD_LOAD_MUX);
+
+	return 0;
+}
+
+int bcm6838_pinctrl_probe(struct udevice *dev)
+{
+	struct bcm6838_pinctrl_priv *priv = dev_get_priv(dev);
+	const struct bcm6838_test_port_hw *hw =
+		(const struct bcm6838_test_port_hw *)dev_get_driver_data(dev);
+	int err;
+	u32 phandle;
+	ofnode node;
+
+	err = ofnode_read_u32(dev_ofnode(dev), "regmap", &phandle);
+	if (err) {
+		dev_err(dev, "%s: unable to read regmap\n", __func__);
+		goto out;
+	}
+
+	node = ofnode_get_by_phandle(phandle);
+	if (!ofnode_valid(node)) {
+		dev_err(dev, "%s: unable to find node\n", __func__);
+		err = -EINVAL;
+		goto out;
+	}
+
+	priv->regmap = syscon_node_to_regmap(node);
+	if (!priv->regmap) {
+		dev_err(dev, "%s: unable to find regmap\n", __func__);
+		err = -ENODEV;
+		goto out;
+	}
+
+	err = ofnode_read_u32(dev_ofnode(dev), "brcm,pins-count",
+			      &priv->pins_count);
+	if (err) {
+		dev_err(dev, "%s: unable to read brcm,pins-count\n",
+			__func__);
+		goto out;
+	}
+
+	err = ofnode_read_u32(dev_ofnode(dev), "brcm,functions-count",
+			      &priv->functions_count);
+	if (err) {
+		dev_err(dev, "%s: unable to read brcm,functions-count\n",
+			__func__);
+		goto out;
+	}
+
+	priv->hw = hw;
+
+ out:
+	return err;
+}
+
+const struct pinctrl_ops bcm6838_pinctrl_ops = {
+	.set_state = pinctrl_generic_set_state,
+	.get_pins_count = bcm6838_pinctrl_get_pins_count,
+	.get_pin_name = bcm6838_pinctrl_get_pin_name,
+	.get_functions_count = bcm6838_pinctrl_get_functions_count,
+	.get_function_name = bcm6838_pinctrl_get_function_name,
+	.pinmux_set = bcm6838_pinctrl_pinmux_set,
+};
+
+static const struct udevice_id bcm6838_pinctrl_match[] = {
+	{
+		.compatible = "brcm,bcm6838-pinctrl",
+		.data = (ulong)&bcm6838_hw,
+	},
+	{ /* sentinel */ }
+};
+
+U_BOOT_DRIVER(bcm6838_pinctrl) = {
+	.name = "bcm6838_pinctrl",
+	.id = UCLASS_PINCTRL,
+	.of_match = bcm6838_pinctrl_match,
+	.ops = &bcm6838_pinctrl_ops,
+	.priv_auto_alloc_size = sizeof(struct bcm6838_pinctrl_priv),
+	.probe = bcm6838_pinctrl_probe,
+};