@@ -192,6 +192,15 @@ config PWM_DWC_PCI
To compile this driver as a module, choose M here: the module
will be called pwm-dwc-pci.
+config PWM_DWC_OF
+ tristate "DesignWare PWM Controller (OF bus)"
+ depends on PWM_DWC && OF
+ help
+ PWM driver for Synopsys DWC PWM Controller on an OF bus.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pwm-dwc-of.
+
config PWM_EP93XX
tristate "Cirrus Logic EP93xx PWM support"
depends on ARCH_EP93XX || COMPILE_TEST
@@ -15,6 +15,7 @@ obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o
obj-$(CONFIG_PWM_CRC) += pwm-crc.o
obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o
obj-$(CONFIG_PWM_DWC) += pwm-dwc.o
+obj-$(CONFIG_PWM_DWC_OF) += pwm-dwc-of.o
obj-$(CONFIG_PWM_DWC_PCI) += pwm-dwc-pci.o
obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
obj-$(CONFIG_PWM_FSL_FTM) += pwm-fsl-ftm.o
new file mode 100644
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DesignWare PWM Controller driver OF
+ *
+ * Copyright (C) 2022 SiFive, Inc.
+ */
+
+#include <linux/bitops.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/pwm.h>
+#include <linux/io.h>
+
+#include "pwm-dwc.h"
+
+static int dwc_pwm_plat_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct dwc_pwm *dwc;
+ struct clk *bus;
+ u32 nr_pwm;
+
+ dwc = dwc_pwm_alloc(dev);
+ if (!dwc)
+ return -ENOMEM;
+
+ if (!device_property_read_u32(dev, "snps,pwm-number", &nr_pwm)) {
+ if (nr_pwm > DWC_TIMERS_TOTAL)
+ dev_err(dev, "too many PWMs (%d) specified, capping at %d\n",
+ nr_pwm, dwc->chip.npwm);
+ else
+ dwc->chip.npwm = nr_pwm;
+ }
+
+ dwc->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(dwc->base))
+ return PTR_ERR(dwc->base);
+
+ bus = devm_clk_get_enabled(dev, NULL);
+ if (IS_ERR(bus))
+ return dev_err_probe(dev, PTR_ERR(bus),
+ "failed to get clock\n");
+
+ dwc->clk = devm_clk_get_enabled(dev, "timer");
+ if (IS_ERR(dwc->clk))
+ return dev_err_probe(dev, PTR_ERR(dwc->clk),
+ "failed to get timer clock\n");
+
+ dwc->clk_ns = NSEC_PER_SEC / clk_get_rate(dwc->clk);
+ return devm_pwmchip_add(dev, &dwc->chip);
+}
+
+static const struct of_device_id dwc_pwm_dt_ids[] = {
+ { .compatible = "snps,dw-apb-timers-pwm2" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, dwc_pwm_dt_ids);
+
+static struct platform_driver dwc_pwm_plat_driver = {
+ .driver = {
+ .name = "dwc-pwm",
+ .of_match_table = dwc_pwm_dt_ids,
+ },
+ .probe = dwc_pwm_plat_probe,
+};
+
+module_platform_driver(dwc_pwm_plat_driver);
+
+MODULE_ALIAS("platform:dwc-pwm-of");
+MODULE_AUTHOR("Ben Dooks <ben.dooks@sifive.com>");
+MODULE_DESCRIPTION("DesignWare PWM Controller");
+MODULE_LICENSE("GPL");
The dwc pwm controller can be used in non-PCI systems, so allow either platform or OF based probing. Signed-off-by: Ben Dooks <ben.dooks@sifive.com> --- v5: - fix missing " in kconfig - remove .remove method, devm already sorts this. - merge pwm-number code - split the of code out of the core - get bus clock v4: - moved the compile test code earlier - fixed review comments - used NS_PER_SEC - use devm_clk_get_enabled - ensure we get the bus clock v3: - changed compatible name fixup add pwm/Kconfig --- drivers/pwm/Kconfig | 9 +++++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-dwc-of.c | 76 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 86 insertions(+) create mode 100644 drivers/pwm/pwm-dwc-of.c