regulator: Add Renesas RZ/G2L USB VBUS regulator driver

As per the RZ/G2L HW manual, VBUSEN can be controlled by the VBOUT
bit of the VBUS Control Register. This register is mapped in the reset
framework. The reset driver expose this register as regmap and instantiates
this driver. The consumer will use the regulator API to control the VBOUT
bit as the control need to be done in the atomic context.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://patch.msgid.link/20240616105402.45211-5-biju.das.jz@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index d333be2bea3bebf83cd25a9ab22bcf5e04e435c0..0281a9a6f4cee0ea5fe055443e657d96071cfe4e 100644 (file)
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1634,6 +1634,15 @@ config REGULATOR_UNIPHIER
        help
          Support for regulators implemented on Socionext UniPhier SoCs.
 
+config REGULATOR_RZG2L_VBCTRL
+       tristate "Renesas RZ/G2L USB VBUS regulator driver"
+       depends on ARCH_RZG2L || COMPILE_TEST
+       depends on OF
+       select REGMAP_MMIO
+       default ARCH_RZG2L
+       help
+         Support for VBUS regulators implemented on Renesas RZ/G2L SoCs.
+
 config REGULATOR_VCTRL
        tristate "Voltage controlled regulators"
        depends on OF

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index ba15fa5f30adc818c8cdd8a804d4bbe017527c9d..6127ffb4b011fa473d2292655223f1828774fab0 100644 (file)
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -189,6 +189,7 @@ obj-$(CONFIG_REGULATOR_TPS65132) += tps65132-regulator.o
 obj-$(CONFIG_REGULATOR_TPS68470) += tps68470-regulator.o
 obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o twl6030-regulator.o
 obj-$(CONFIG_REGULATOR_UNIPHIER) += uniphier-regulator.o
+obj-$(CONFIG_REGULATOR_RZG2L_VBCTRL) += renesas-usb-vbus-regulator.o
 obj-$(CONFIG_REGULATOR_VCTRL) += vctrl-regulator.o
 obj-$(CONFIG_REGULATOR_VEXPRESS) += vexpress-regulator.o
 obj-$(CONFIG_REGULATOR_VQMMC_IPQ4019) += vqmmc-ipq4019-regulator.o

diff --git a/drivers/regulator/renesas-usb-vbus-regulator.c b/drivers/regulator/renesas-usb-vbus-regulator.c
new file mode 100644 (file)
index 0000000..4eceb6b
--- /dev/null
+++ b/drivers/regulator/renesas-usb-vbus-regulator.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Renesas USB VBUS output regulator driver
+//
+// Copyright (C) 2024 Renesas Electronics Corporation
+//
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+static const struct regulator_ops rzg2l_usb_vbus_reg_ops = {
+       .enable     = regulator_enable_regmap,
+       .disable    = regulator_disable_regmap,
+       .is_enabled = regulator_is_enabled_regmap,
+};
+
+static const struct regulator_desc rzg2l_usb_vbus_rdesc = {
+       .name = "vbus",
+       .of_match = of_match_ptr("regulator-vbus"),
+       .ops = &rzg2l_usb_vbus_reg_ops,
+       .type = REGULATOR_VOLTAGE,
+       .owner = THIS_MODULE,
+       .enable_reg  = 0,
+       .enable_mask = BIT(0),
+       .enable_is_inverted = true,
+       .fixed_uV       = 5000000,
+       .n_voltages     = 1,
+};
+
+static int rzg2l_usb_vbus_regulator_probe(struct platform_device *pdev)
+{
+       struct regulator_config config = { };
+       struct device *dev = &pdev->dev;
+       struct regulator_dev *rdev;
+
+       config.regmap = dev_get_regmap(dev->parent, NULL);
+       if (!config.regmap)
+               return dev_err_probe(dev, -ENOENT, "Failed to get regmap\n");
+
+       config.dev = dev;
+       config.of_node = of_get_child_by_name(dev->parent->of_node, "regulator-vbus");
+       if (!config.of_node)
+               return dev_err_probe(dev, -ENODEV, "regulator node not found\n");
+
+       rdev = devm_regulator_register(dev, &rzg2l_usb_vbus_rdesc, &config);
+       if (IS_ERR(rdev)) {
+               of_node_put(config.of_node);
+               return dev_err_probe(dev, PTR_ERR(rdev),
+                                    "not able to register vbus regulator\n");
+       }
+
+       of_node_put(config.of_node);
+
+       return 0;
+}
+
+static struct platform_driver rzg2l_usb_vbus_regulator_driver = {
+       .probe = rzg2l_usb_vbus_regulator_probe,
+       .driver = {
+               .name = "rzg2l-usb-vbus-regulator",
+               .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+       },
+};
+module_platform_driver(rzg2l_usb_vbus_regulator_driver);
+
+MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
+MODULE_DESCRIPTION("Renesas RZ/G2L USB Vbus Regulator Driver");
+MODULE_LICENSE("GPL");