[PATCH v4 03/10] pwm: max7360: Add MAX7360 PWM support

[mathieu.dubois-briand@xxxxxxxxxxx]

From: Kamel Bouhara <kamel.bouhara@xxxxxxxxxxx>

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

Signed-off-by: Kamel Bouhara <kamel.bouhara@xxxxxxxxxxx>
Co-developed-by: Mathieu Dubois-Briand <mathieu.dubois-briand@xxxxxxxxxxx>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@xxxxxxxxxxx>
---
 drivers/pwm/Kconfig       |  10 +++
 drivers/pwm/Makefile      |   1 +
 drivers/pwm/pwm-max7360.c | 213 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 224 insertions(+)

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 0915c1e7df16..fac811ee46b5 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -745,4 +745,14 @@ config PWM_XILINX
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-xilinx.
 
+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.
+
 endif
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index 9081e0c0e9e0..ae8908ffc892 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -36,6 +36,7 @@ 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_MESON)		+= pwm-meson.o
 obj-$(CONFIG_PWM_MEDIATEK)	+= pwm-mediatek.o
 obj-$(CONFIG_PWM_MICROCHIP_CORE)	+= pwm-microchip-core.o
diff --git a/drivers/pwm/pwm-max7360.c b/drivers/pwm/pwm-max7360.c
new file mode 100644
index 000000000000..f1257c20add2
--- /dev/null
+++ b/drivers/pwm/pwm-max7360.c
@@ -0,0 +1,213 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2024 Bootlin
+ *
+ * Author: Kamel BOUHARA <kamel.bouhara@xxxxxxxxxxx>
+ * Author: Mathieu Dubois-Briand <mathieu.dubois-briand@xxxxxxxxxxx>
+ *
+ * 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.
+ */
+#include <linux/err.h>
+#include <linux/math.h>
+#include <linux/mfd/max7360.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+
+#define MAX7360_NUM_PWMS			8
+#define MAX7360_PWM_MAX_RES			255
+#define MAX7360_PWM_PERIOD_NS			2000000 /* 500 Hz */
+#define MAX7360_PWM_COMMON_PWN			BIT(5)
+#define MAX7360_PWM_CTRL_ENABLE(n)		BIT(n)
+#define MAX7360_PWM_PORT(n)			BIT(n)
+
+struct max7360_pwm {
+	struct device *parent;
+	struct regmap *regmap;
+};
+
+struct max7360_pwm_waveform {
+	u8 duty_steps;
+};
+
+static inline struct max7360_pwm *max7360_pwm_from_chip(struct pwm_chip *chip)
+{
+	return pwmchip_get_drvdata(chip);
+}
+
+static int max7360_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct max7360_pwm *max7360_pwm;
+	int ret;
+
+	max7360_pwm = max7360_pwm_from_chip(chip);
+	ret = max7360_port_pin_request(max7360_pwm->parent, pwm->hwpwm, true);
+	if (ret) {
+		dev_warn(&chip->dev, "failed to request pwm-%d\n", pwm->hwpwm);
+		return ret;
+	}
+
+	ret = regmap_write_bits(max7360_pwm->regmap,
+				MAX7360_REG_PWMCFG(pwm->hwpwm),
+				MAX7360_PWM_COMMON_PWN,
+				0);
+	if (ret)
+		return ret;
+
+	return regmap_write_bits(max7360_pwm->regmap, MAX7360_REG_PORTS,
+				 MAX7360_PWM_PORT(pwm->hwpwm),
+				 MAX7360_PWM_PORT(pwm->hwpwm));
+}
+
+static void max7360_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct max7360_pwm *max7360_pwm;
+
+	max7360_pwm = max7360_pwm_from_chip(chip);
+	max7360_port_pin_request(max7360_pwm->parent, pwm->hwpwm, false);
+}
+
+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.
+	 */
+
+	duty_steps = mul_u64_u64_div_u64(wf->duty_length_ns, MAX7360_PWM_MAX_RES,
+					 MAX7360_PWM_PERIOD_NS);
+
+	wfhw->duty_steps = min(MAX7360_PWM_MAX_RES, duty_steps);
+
+	return 0;
+}
+
+static int max7360_pwm_round_waveform_fromhw(struct pwm_chip *chip, struct pwm_device *pwm,
+					     const void *_wfhw, struct pwm_waveform *wf)
+{
+	const struct max7360_pwm_waveform *wfhw = _wfhw;
+
+	wf->period_length_ns = MAX7360_PWM_PERIOD_NS;
+	wf->duty_offset_ns = 0;
+	wf->duty_length_ns = DIV64_U64_ROUND_UP(wfhw->duty_steps * MAX7360_PWM_PERIOD_NS,
+						MAX7360_PWM_MAX_RES);
+
+	return 0;
+}
+
+static int max7360_pwm_write_waveform(struct pwm_chip *chip,
+				      struct pwm_device *pwm,
+				      const void *_wfhw)
+{
+	const struct max7360_pwm_waveform *wfhw = _wfhw;
+	struct max7360_pwm *max7360_pwm;
+	unsigned int val;
+	int ret;
+
+	max7360_pwm = max7360_pwm_from_chip(chip);
+
+	val = (wfhw->duty_steps == 0) ? 0 : MAX7360_PWM_CTRL_ENABLE(pwm->hwpwm);
+	ret = regmap_write_bits(max7360_pwm->regmap, MAX7360_REG_GPIOCTRL,
+				MAX7360_PWM_CTRL_ENABLE(pwm->hwpwm), val);
+
+	if (!ret && wfhw->duty_steps != 0) {
+		ret = regmap_write(max7360_pwm->regmap, MAX7360_REG_PWM(pwm->hwpwm),
+				   wfhw->duty_steps);
+	}
+
+	return ret;
+}
+
+static int max7360_pwm_read_waveform(struct pwm_chip *chip,
+				     struct pwm_device *pwm,
+				     void *_wfhw)
+{
+	struct max7360_pwm_waveform *wfhw = _wfhw;
+	struct max7360_pwm *max7360_pwm;
+	unsigned int val;
+	int ret;
+
+	max7360_pwm = max7360_pwm_from_chip(chip);
+
+	ret = regmap_read(max7360_pwm->regmap, MAX7360_REG_GPIOCTRL, &val);
+	if (ret)
+		return ret;
+
+	if (val & MAX7360_PWM_CTRL_ENABLE(pwm->hwpwm)) {
+		ret = regmap_read(max7360_pwm->regmap, MAX7360_REG_PWM(pwm->hwpwm),
+				  &val);
+		val = wfhw->duty_steps;
+	} else {
+		wfhw->duty_steps = 0;
+	}
+
+	return ret;
+}
+
+static const struct pwm_ops max7360_pwm_ops = {
+	.request = max7360_pwm_request,
+	.free = max7360_pwm_free,
+	.round_waveform_tohw = max7360_pwm_round_waveform_tohw,
+	.round_waveform_fromhw = max7360_pwm_round_waveform_fromhw,
+	.read_waveform = max7360_pwm_read_waveform,
+	.write_waveform = max7360_pwm_write_waveform,
+};
+
+static int max7360_pwm_probe(struct platform_device *pdev)
+{
+	struct max7360_pwm *max7360_pwm;
+	struct pwm_chip *chip;
+	int ret;
+
+	if (!pdev->dev.parent)
+		return dev_err_probe(&pdev->dev, -ENODEV, "no parent device\n");
+
+	chip = devm_pwmchip_alloc(pdev->dev.parent, MAX7360_NUM_PWMS,
+				  sizeof(*max7360_pwm));
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	chip->ops = &max7360_pwm_ops;
+
+	max7360_pwm = max7360_pwm_from_chip(chip);
+	max7360_pwm->parent = pdev->dev.parent;
+
+	max7360_pwm->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!max7360_pwm->regmap)
+		return dev_err_probe(&pdev->dev, -ENODEV,
+				     "could not get parent regmap\n");
+
+	ret = devm_pwmchip_add(&pdev->dev, chip);
+	if (ret != 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "failed to add PWM chip\n");
+
+	return 0;
+}
+
+static struct platform_driver max7360_pwm_driver = {
+	.driver = {
+		.name = "max7360-pwm",
+	},
+	.probe = max7360_pwm_probe,
+};
+module_platform_driver(max7360_pwm_driver);
+
+MODULE_DESCRIPTION("MAX7360 PWM driver");
+MODULE_AUTHOR("Kamel BOUHARA <kamel.bouhara@xxxxxxxxxxx>");
+MODULE_AUTHOR("Mathieu Dubois-Briand <mathieu.dubois-briand@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");

-- 
2.39.5