@@ -534,6 +534,7 @@ S: Maintained
F: Documentation/devicetree/bindings/*/adi,adp5585*.yaml
F: drivers/gpio/gpio-adp5585.c
F: drivers/mfd/adp5585.c
+F: drivers/pwm/pwm-adp5585.c
F: include/linux/mfd/adp5585.h
ADP5588 QWERTY KEYPAD AND IO EXPANDER DRIVER (ADP5588/ADP5587)
@@ -47,6 +47,13 @@ config PWM_AB8500
To compile this driver as a module, choose M here: the module
will be called pwm-ab8500.
+config PWM_ADP5585
+ tristate "ADP5585 PWM support"
+ depends on MFD_ADP5585
+ help
+ This option enables support for the PWM function found in the Analog
+ Devices ADP5585.
+
config PWM_APPLE
tristate "Apple SoC PWM support"
depends on ARCH_APPLE || COMPILE_TEST
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_PWM) += core.o
obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o
+obj-$(CONFIG_PWM_ADP5585) += pwm-adp5585.o
obj-$(CONFIG_PWM_APPLE) += pwm-apple.o
obj-$(CONFIG_PWM_ATMEL) += pwm-atmel.o
obj-$(CONFIG_PWM_ATMEL_HLCDC_PWM) += pwm-atmel-hlcdc.o
new file mode 100644
@@ -0,0 +1,187 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Analog Devices ADP5585 PWM driver
+ *
+ * Copyright 2022 NXP
+ * Copyright 2024 Ideas on Board Oy
+ *
+ * Limitations:
+ * - The .apply() operation executes atomically, but may not wait for the
+ * period to complete (this is not documented and would need to be tested).
+ * - Disabling the PWM drives the output pin to a low level immediately.
+ * - The hardware can only generate normal polarity output.
+ */
+
+#include <linux/device.h>
+#include <linux/math64.h>
+#include <linux/minmax.h>
+#include <linux/mfd/adp5585.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/time.h>
+
+#define ADP5585_PWM_CHAN_NUM 1
+
+#define ADP5585_PWM_OSC_FREQ_HZ 1000000U
+#define ADP5585_PWM_MIN_PERIOD_NS (2ULL * NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ)
+#define ADP5585_PWM_MAX_PERIOD_NS (2ULL * 0xffff * NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ)
+
+static int pwm_adp5585_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct regmap *regmap = pwmchip_get_drvdata(chip);
+ int ret;
+
+ ret = regmap_update_bits(regmap, ADP5585_PIN_CONFIG_C,
+ ADP5585_R3_EXTEND_CFG_MASK,
+ ADP5585_R3_EXTEND_CFG_PWM_OUT);
+ if (ret)
+ return ret;
+
+ return regmap_update_bits(regmap, ADP5585_GENERAL_CFG,
+ ADP5585_OSC_EN, ADP5585_OSC_EN);
+}
+
+static void pwm_adp5585_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct regmap *regmap = pwmchip_get_drvdata(chip);
+
+ regmap_update_bits(regmap, ADP5585_PIN_CONFIG_C,
+ ADP5585_R3_EXTEND_CFG_MASK,
+ ADP5585_R3_EXTEND_CFG_GPIO4);
+ regmap_update_bits(regmap, ADP5585_GENERAL_CFG,
+ ADP5585_OSC_EN, 0);
+}
+
+static int pwm_adp5585_apply(struct pwm_chip *chip,
+ struct pwm_device *pwm,
+ const struct pwm_state *state)
+{
+ struct regmap *regmap = pwmchip_get_drvdata(chip);
+ u64 period, duty_cycle;
+ u32 on, off;
+ int ret;
+
+ if (!state->enabled)
+ return regmap_update_bits(regmap, ADP5585_PWM_CFG,
+ ADP5585_PWM_EN, 0);
+
+ if (state->polarity != PWM_POLARITY_NORMAL)
+ return -EINVAL;
+
+ if (state->period < ADP5585_PWM_MIN_PERIOD_NS)
+ return -EINVAL;
+
+ period = min(state->period, ADP5585_PWM_MAX_PERIOD_NS);
+ duty_cycle = min(state->duty_cycle, period);
+
+ /*
+ * Compute the on and off time. As the internal oscillator frequency is
+ * 1MHz, the calculation can be simplified without loss of precision.
+ */
+ on = div_u64(duty_cycle, NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ);
+ off = div_u64(period, NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ) - on;
+
+ ret = regmap_write(regmap, ADP5585_PWM_OFFT_LOW,
+ off & 0xff);
+ if (ret)
+ return ret;
+ ret = regmap_write(regmap, ADP5585_PWM_OFFT_HIGH,
+ (off >> 8) & 0xff);
+ if (ret)
+ return ret;
+ ret = regmap_write(regmap, ADP5585_PWM_ONT_LOW,
+ on & 0xff);
+ if (ret)
+ return ret;
+ ret = regmap_write(regmap, ADP5585_PWM_ONT_HIGH,
+ (on >> 8) & 0xff);
+ if (ret)
+ return ret;
+
+ /* Enable PWM in continuous mode and no external AND'ing. */
+ ret = regmap_update_bits(regmap, ADP5585_PWM_CFG,
+ ADP5585_PWM_IN_AND | ADP5585_PWM_MODE |
+ ADP5585_PWM_EN, ADP5585_PWM_EN);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int pwm_adp5585_get_state(struct pwm_chip *chip,
+ struct pwm_device *pwm,
+ struct pwm_state *state)
+{
+ struct regmap *regmap = pwmchip_get_drvdata(chip);
+ unsigned int on, off;
+ unsigned int val;
+
+ regmap_read(regmap, ADP5585_PWM_OFFT_LOW, &off);
+ regmap_read(regmap, ADP5585_PWM_OFFT_HIGH, &val);
+ off |= val << 8;
+
+ regmap_read(regmap, ADP5585_PWM_ONT_LOW, &on);
+ regmap_read(regmap, ADP5585_PWM_ONT_HIGH, &val);
+ on |= val << 8;
+
+ state->duty_cycle = on * (NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ);
+ state->period = (on + off) * (NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ);
+
+ state->polarity = PWM_POLARITY_NORMAL;
+
+ regmap_read(regmap, ADP5585_PWM_CFG, &val);
+ state->enabled = !!(val & ADP5585_PWM_EN);
+
+ return 0;
+}
+
+static const struct pwm_ops adp5585_pwm_ops = {
+ .request = pwm_adp5585_request,
+ .free = pwm_adp5585_free,
+ .apply = pwm_adp5585_apply,
+ .get_state = pwm_adp5585_get_state,
+};
+
+static int adp5585_pwm_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct adp5585_dev *adp5585 = dev_get_drvdata(dev->parent);
+ struct pwm_chip *chip;
+ int ret;
+
+ chip = devm_pwmchip_alloc(dev, ADP5585_PWM_CHAN_NUM, 0);
+ if (IS_ERR(chip))
+ return PTR_ERR(chip);
+
+ device_set_of_node_from_dev(dev, dev->parent);
+
+ pwmchip_set_drvdata(chip, adp5585->regmap);
+ chip->ops = &adp5585_pwm_ops;
+
+ ret = devm_pwmchip_add(dev, chip);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to add PWM chip\n");
+
+ return 0;
+}
+
+static const struct platform_device_id adp5585_pwm_id_table[] = {
+ { "adp5585-pwm" },
+ { /* Sentinel */ },
+};
+MODULE_DEVICE_TABLE(platform, adp5585_pwm_id_table);
+
+static struct platform_driver adp5585_pwm_driver = {
+ .driver = {
+ .name = "adp5585-pwm",
+ },
+ .probe = adp5585_pwm_probe,
+ .id_table = adp5585_pwm_id_table,
+};
+module_platform_driver(adp5585_pwm_driver);
+
+MODULE_AUTHOR("Xiaoning Wang <xiaoning.wang@nxp.com>");
+MODULE_DESCRIPTION("ADP5585 PWM Driver");
+MODULE_LICENSE("GPL");