@@ -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
@@ -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
new file mode 100644
@@ -0,0 +1,213 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2024 Bootlin
+ *
+ * Author: Kamel BOUHARA <kamel.bouhara@bootlin.com>
+ * Author: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
+ *
+ * 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@bootlin.com>");
+MODULE_AUTHOR("Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>");
+MODULE_LICENSE("GPL");