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@xxxxxxxxxx> --- .../devicetree/bindings/pwm/pwm-synposys.yaml | 40 ++++++++++++++ drivers/pwm/Kconfig | 5 +- drivers/pwm/pwm-dwc.c | 53 +++++++++++++++++++ 3 files changed, 96 insertions(+), 2 deletions(-) create mode 100644 Documentation/devicetree/bindings/pwm/pwm-synposys.yaml diff --git a/Documentation/devicetree/bindings/pwm/pwm-synposys.yaml b/Documentation/devicetree/bindings/pwm/pwm-synposys.yaml new file mode 100644 index 000000000000..38ac0da75272 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/pwm-synposys.yaml @@ -0,0 +1,40 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (C) 2022 SiFive, Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pwm/pwm-synposys.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Synopsys PWM controller + +maintainers: + - Ben Dooks <ben.dooks@xxxxxxxxxx> + +properties: + "#pwm-cells": + description: | + See pwm.yaml in this directory for a description of the cells format. + + clocks: + items: + - description: Interface bus clock + - description: PWM reference clock + + clock-names: + items: + - const: bus + - const: timer + + compatible: + oneOf: + - items: + - const: snps,pwm + +required: + - "#pwm-cells" + - compatible + - reg + - clocks + - clock-names + +additionalProperties: false diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 904de8d61828..e1aa645c1084 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -166,9 +166,10 @@ config PWM_CROS_EC config PWM_DWC tristate "DesignWare PWM Controller" - depends on PCI + depends on PCI || OF help - PWM driver for Synopsys DWC PWM Controller attached to a PCI bus. + PWM driver for Synopsys DWC PWM Controller attached to either a + PCI or platform bus. To compile this driver as a module, choose M here: the module will be called pwm-dwc. diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c index 61f11e0a9319..235cb730c888 100644 --- a/drivers/pwm/pwm-dwc.c +++ b/drivers/pwm/pwm-dwc.c @@ -18,6 +18,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> +#include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/pwm.h> @@ -319,6 +320,58 @@ static struct pci_driver dwc_pwm_driver = { module_pci_driver(dwc_pwm_driver); +#ifdef CONFIG_OF +static int dwc_pwm_plat_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct dwc_pwm *dwc; + int ret; + + dwc = dwc_pwm_alloc(dev); + if (!dwc) + return -ENOMEM; + + dwc->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(dwc->base)) + return dev_err_probe(dev, PTR_ERR(dwc->base), + "failed to map IO\n"); + + ret = pwmchip_add(&dwc->chip); + if (ret) + return ret; + + return 0; +} + +static int dwc_pwm_plat_remove(struct platform_device *pdev) +{ + struct dwc_pwm *dwc = platform_get_drvdata(pdev); + + pwmchip_remove(&dwc->chip); + return 0; +} + +static const struct of_device_id dwc_pwm_dt_ids[] = { + { .compatible = "snps,pwm" }, + { }, +}; +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, + .remove = dwc_pwm_plat_remove, +}; + +module_platform_driver(dwc_pwm_plat_driver); + +MODULE_ALIAS("platform:dwc-pwm"); +#endif /* CONFIG_OF */ + + MODULE_AUTHOR("Felipe Balbi (Intel)"); MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>"); MODULE_AUTHOR("Raymond Tan <raymond.tan@xxxxxxxxx>"); -- 2.35.1
