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authorDavid Lechner <david@lechnology.com>2019-09-01 17:58:22 -0500
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2019-10-17 21:17:42 +0100
commit7cabf9251a2f38db1ad1e49be2738955ab61d381 (patch)
tree328c8744bd2cecdb759fa68b95840bc0cbcfd644 /drivers/bus/ti-pwmss.c
parent54ecb8f7028c5eb3d740bb82b0f1d90f2df63c5c (diff)
bus/ti-pwmss: move TI PWMSS driver from PWM to bus subsystem
The TI PWMSS driver is a simple bus driver for providing power power management for the PWM peripherals on TI AM33xx SoCs, namely eCAP, eHRPWM and eQEP. The eQEP is a counter rather than a PWM, so it does not make sense to have the bus driver in the PWM subsystem since the PWMSS is not exclusive to PWM devices. Signed-off-by: David Lechner <david@lechnology.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/bus/ti-pwmss.c')
-rw-r--r--drivers/bus/ti-pwmss.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/drivers/bus/ti-pwmss.c b/drivers/bus/ti-pwmss.c
new file mode 100644
index 000000000000..e9c26c94251b
--- /dev/null
+++ b/drivers/bus/ti-pwmss.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * TI PWM Subsystem driver
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/of_device.h>
+
+static const struct of_device_id pwmss_of_match[] = {
+ { .compatible = "ti,am33xx-pwmss" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, pwmss_of_match);
+
+static int pwmss_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct device_node *node = pdev->dev.of_node;
+
+ pm_runtime_enable(&pdev->dev);
+
+ /* Populate all the child nodes here... */
+ ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
+ if (ret)
+ dev_err(&pdev->dev, "no child node found\n");
+
+ return ret;
+}
+
+static int pwmss_remove(struct platform_device *pdev)
+{
+ pm_runtime_disable(&pdev->dev);
+ return 0;
+}
+
+static struct platform_driver pwmss_driver = {
+ .driver = {
+ .name = "pwmss",
+ .of_match_table = pwmss_of_match,
+ },
+ .probe = pwmss_probe,
+ .remove = pwmss_remove,
+};
+
+module_platform_driver(pwmss_driver);
+
+MODULE_DESCRIPTION("PWM Subsystem driver");
+MODULE_AUTHOR("Texas Instruments");
+MODULE_LICENSE("GPL");