linux-kernel - [PATCH 4/8] pwm: dwc: add of/platform support

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Date:   Fri,  5 Aug 2022 17:50:29 +0100
From:   Ben Dooks <ben.dooks@...ive.com>
To:     linux-pwm@...r.kernel.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lee Jones <lee.jones@...aro.org>,
        u.kleine-koenig@...gutronix.de,
        Thierry Reding <thierry.reding@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Greentime Hu <greentime.hu@...ive.com>,
        jarkko.nikula@...ux.intel.com,
        William Salmon <william.salmon@...ive.com>,
        Jude Onyenegecha --subject-prefix=PATCH v3 
        <jude.onyenegecha@...ive.com>, Ben Dooks <ben.dooks@...ive.com>
Subject: [PATCH 4/8] pwm: dwc: add of/platform support

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@...ive.com>
---
v3:
 - changed compatible name
---
 drivers/pwm/Kconfig   |  5 ++--
 drivers/pwm/pwm-dwc.c | 53 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 60d13a949bc5..b8717877a524 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -176,9 +176,10 @@ 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..d5f2df6fee62 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,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,
+	.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@...ux.intel.com>");
 MODULE_AUTHOR("Raymond Tan <raymond.tan@...el.com>");
-- 
2.35.1