From: Kamel Bouhara <kamel.bouhara@bootlin.com>

Add driver for Maxim Integrated MAX7360 PWM controller, supporting up to
8 independent PWM outputs.

Signed-off-by: Kamel Bouhara <kamel.bouhara@bootlin.com>
Co-developed-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/pwm/Kconfig       |  10 +++
 drivers/pwm/Makefile      |   1 +
 drivers/pwm/pwm-max7360.c | 209 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 220 insertions(+)

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index f00ce973dddf..f2b1ce47de7f 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig

@@ -432,6 +432,16 @@ config PWM_LPSS_PLATFORM
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-lpss-platform.
 
+config PWM_MAX7360
+	tristate "MAX7360 PWMs"
+	depends on MFD_MAX7360
+	help
+	  PWM driver for Maxim Integrated MAX7360 multifunction device, with
+	  support for up to 8 PWM outputs.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pwm-max7360.
+
 config PWM_MC33XS2410
 	tristate "MC33XS2410 PWM support"
 	depends on OF

diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index ff4f47e5fb7a..dfa8b4966ee1 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile

@@ -38,6 +38,7 @@ obj-$(CONFIG_PWM_LPC32XX)	+= pwm-lpc32xx.o
 obj-$(CONFIG_PWM_LPSS)		+= pwm-lpss.o
 obj-$(CONFIG_PWM_LPSS_PCI)	+= pwm-lpss-pci.o
 obj-$(CONFIG_PWM_LPSS_PLATFORM)	+= pwm-lpss-platform.o
+obj-$(CONFIG_PWM_MAX7360)	+= pwm-max7360.o
 obj-$(CONFIG_PWM_MC33XS2410)	+= pwm-mc33xs2410.o
 obj-$(CONFIG_PWM_MEDIATEK)	+= pwm-mediatek.o
 obj-$(CONFIG_PWM_MESON)		+= pwm-meson.o

diff --git a/drivers/pwm/pwm-max7360.c b/drivers/pwm/pwm-max7360.c
new file mode 100644
index 000000000000..5a0c10d2320e
--- /dev/null
+++ b/drivers/pwm/pwm-max7360.c

@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2025 Bootlin
+ *
+ * Author: Kamel BOUHARA <kamel.bouhara@bootlin.com>
+ * Author: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
+ *
+ * PWM functionality of the MAX7360 multi-function device.
+ * https://www.analog.com/media/en/technical-documentation/data-sheets/MAX7360.pdf
+ *
+ * Limitations:
+ * - Only supports normal polarity.
+ * - The period is fixed to 2 ms.
+ * - Only the duty cycle can be changed, new values are applied at the beginning
+ *   of the next cycle.
+ * - When disabled, the output is put in Hi-Z immediately.
+ */
+#include <linux/bits.h>
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/math64.h>
+#include <linux/mfd/max7360.h>
+#include <linux/minmax.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/time.h>
+#include <linux/types.h>
+
+#define MAX7360_NUM_PWMS			8
+#define MAX7360_PWM_MAX				255
+#define MAX7360_PWM_STEPS			256
+#define MAX7360_PWM_PERIOD_NS			(2 * NSEC_PER_MSEC)
+
+struct max7360_pwm_waveform {
+	u8 duty_steps;
+	bool enabled;
+};
+
+static int max7360_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct regmap *regmap = pwmchip_get_drvdata(chip);
+
+	/*
+	 * Make sure we use the individual PWM configuration register and not
+	 * the global one.
+	 * We never need to use the global one, so there is no need to revert
+	 * that in the .free() callback.
+	 */
+	return regmap_write_bits(regmap, MAX7360_REG_PWMCFG(pwm->hwpwm),
+				 MAX7360_PORT_CFG_COMMON_PWM, 0);
+}
+
+static int max7360_pwm_round_waveform_tohw(struct pwm_chip *chip,
+					   struct pwm_device *pwm,
+					   const struct pwm_waveform *wf,
+					   void *_wfhw)
+{
+	struct max7360_pwm_waveform *wfhw = _wfhw;
+	u64 duty_steps;
+
+	/*
+	 * Ignore user provided values for period_length_ns and duty_offset_ns:
+	 * we only support fixed period of MAX7360_PWM_PERIOD_NS and offset of 0.
+	 * Values from 0 to 254 as duty_steps will provide duty cycles of 0/256
+	 * to 254/256, while value 255 will provide a duty cycle of 100%.
+	 */
+	if (wf->duty_length_ns >= MAX7360_PWM_PERIOD_NS) {
+		duty_steps = MAX7360_PWM_MAX;
+	} else {
+		duty_steps = (u32)wf->duty_length_ns * MAX7360_PWM_STEPS / MAX7360_PWM_PERIOD_NS;
+		if (duty_steps == MAX7360_PWM_MAX)
+			duty_steps = MAX7360_PWM_MAX - 1;
+	}
+
+	wfhw->duty_steps = min(MAX7360_PWM_MAX, duty_steps);
+	wfhw->enabled = !!wf->period_length_ns;
+
+	if (wf->period_length_ns < MAX7360_PWM_PERIOD_NS)