[PATCH v4 3/5] mfd: airoha: Add support for Airoha EN7581 MFD

[Lorenzo Bianconi <lorenzo@kernel.org>]

From: Christian Marangi <ansuelsmth@gmail.com>

Support for Airoha EN7581 Multi Function Device that
expose PINCTRL functionality and PWM functionality.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 drivers/mfd/Kconfig                   |  8 ++++
 drivers/mfd/Makefile                  |  2 +
 drivers/mfd/airoha-en7581-gpio-mfd.c  | 72 +++++++++++++++++++++++++++++++++++
 include/linux/mfd/airoha-en7581-mfd.h |  9 +++++
 4 files changed, 91 insertions(+)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index bc8be2e593b6..c690378066ac 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -20,6 +20,14 @@ config MFD_CS5535
 	  This is the core driver for CS5535/CS5536 MFD functions.  This is
 	  necessary for using the board's GPIO and MFGPT functionality.
 
+config MFD_AIROHA_EN7581
+	bool "Airoha EN7581 Multi Function Device"
+	depends on (ARCH_AIROHA || COMPILE_TEST) && OF
+	select MFD_CORE
+	help
+	  Support for Airoha EN7581 Multi Function Device that
+	  expose PINCTRL functionality and PWM functionality.
+
 config MFD_ALTERA_A10SR
 	bool "Altera Arria10 DevKit System Resource chip"
 	depends on ARCH_INTEL_SOCFPGA && SPI_MASTER=y && OF
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 02b651cd7535..075dbff618e0 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -256,6 +256,8 @@ obj-$(CONFIG_INTEL_SOC_PMIC_CHTWC)	+= intel_soc_pmic_chtwc.o
 obj-$(CONFIG_INTEL_SOC_PMIC_CHTDC_TI)	+= intel_soc_pmic_chtdc_ti.o
 obj-$(CONFIG_INTEL_SOC_PMIC_MRFLD)	+= intel_soc_pmic_mrfld.o
 
+obj-$(CONFIG_MFD_AIROHA_EN7581)	+= airoha-en7581-gpio-mfd.o
+
 obj-$(CONFIG_MFD_ALTERA_A10SR)	+= altera-a10sr.o
 obj-$(CONFIG_MFD_ALTERA_SYSMGR) += altera-sysmgr.o
 obj-$(CONFIG_MFD_STPMIC1)	+= stpmic1.o
diff --git a/drivers/mfd/airoha-en7581-gpio-mfd.c b/drivers/mfd/airoha-en7581-gpio-mfd.c
new file mode 100644
index 000000000000..88407ce5747e
--- /dev/null
+++ b/drivers/mfd/airoha-en7581-gpio-mfd.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * MFD driver for Airoha EN7581
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/mfd/airoha-en7581-mfd.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+
+static struct resource airoha_mfd_pinctrl_intr[] = {
+	{
+		.flags = IORESOURCE_IRQ,
+	},
+};
+
+static const struct mfd_cell airoha_mfd_devs[] = {
+	{
+		.name = "pinctrl-airoha",
+		.resources = airoha_mfd_pinctrl_intr,
+		.num_resources = ARRAY_SIZE(airoha_mfd_pinctrl_intr),
+	}, {
+		.name = "pwm-airoha",
+	},
+};
+
+static int airoha_mfd_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct airoha_mfd *mfd;
+	int irq;
+
+	mfd = devm_kzalloc(dev, sizeof(*mfd), GFP_KERNEL);
+	if (!mfd)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, mfd);
+
+	mfd->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(mfd->base))
+		return PTR_ERR(mfd->base);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	airoha_mfd_pinctrl_intr[0].start = irq;
+	airoha_mfd_pinctrl_intr[0].end = irq;
+
+	return devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, airoha_mfd_devs,
+				    ARRAY_SIZE(airoha_mfd_devs), NULL, 0,
+				    NULL);
+}
+
+static const struct of_device_id airoha_mfd_of_match[] = {
+	{ .compatible = "airoha,en7581-gpio-sysctl" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, airoha_mfd_of_match);
+
+static struct platform_driver airoha_mfd_driver = {
+	.probe = airoha_mfd_probe,
+	.driver = {
+		.name = KBUILD_MODNAME,
+		.of_match_table = airoha_mfd_of_match,
+	},
+};
+module_platform_driver(airoha_mfd_driver);
+
+MODULE_AUTHOR("Christian Marangi <ansuelsmth@gmail.com>");
+MODULE_DESCRIPTION("Driver for Airoha EN7581 MFD");
diff --git a/include/linux/mfd/airoha-en7581-mfd.h b/include/linux/mfd/airoha-en7581-mfd.h
new file mode 100644
index 000000000000..25e73952a777
--- /dev/null
+++ b/include/linux/mfd/airoha-en7581-mfd.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_INCLUDE_MFD_AIROHA_EN7581_MFD_H_
+#define _LINUX_INCLUDE_MFD_AIROHA_EN7581_MFD_H_
+
+struct airoha_mfd {
+	void __iomem *base;
+};
+
+#endif  /* _LINUX_INCLUDE_MFD_AIROHA_EN7581_MFD_H_ */

-- 
2.46.0