pwm: pwm-ti*: Remove support for local clock gating

The PWMSS local clock gating registers have no real purpose on OMAP ARM
devices. These registers were left over registers from DSP IP where the
PRCM doesn't exist. There is a silicon bug where gating and ungating clocks
don't function properly. TRMs will be update to indicate that these
registers shouldn't be touched.

Therefore, all code that accesses the PWMSS_CLKCONFIG or PWMSS_CLKSTATUS
will be removed by this patch with zero loss of functionality by the ECAP
and EPWM drivers.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 0 insertions, 49 deletions

diff --git a/drivers/pwm/pwm-tipwmss.c b/drivers/pwm/pwm-tipwmss.c
index 5cf65a15d021..829f4991c96f 100644
--- a/drivers/pwm/pwm-tipwmss.c
+++ b/drivers/pwm/pwm-tipwmss.c
@@ -22,32 +22,6 @@
 #include <linux/pm_runtime.h>
 #include <linux/of_device.h>
 
-#include "pwm-tipwmss.h"
-
-#define PWMSS_CLKCONFIG		0x8	/* Clock gating reg */
-#define PWMSS_CLKSTATUS		0xc	/* Clock gating status reg */
-
-struct pwmss_info {
-	void __iomem	*mmio_base;
-	struct mutex	pwmss_lock;
-	u16		pwmss_clkconfig;
-};
-
-u16 pwmss_submodule_state_change(struct device *dev, int set)
-{
-	struct pwmss_info *info = dev_get_drvdata(dev);
-	u16 val;
-
-	mutex_lock(&info->pwmss_lock);
-	val = readw(info->mmio_base + PWMSS_CLKCONFIG);
-	val |= set;
-	writew(val , info->mmio_base + PWMSS_CLKCONFIG);
-	mutex_unlock(&info->pwmss_lock);
-
-	return readw(info->mmio_base + PWMSS_CLKSTATUS);
-}
-EXPORT_SYMBOL(pwmss_submodule_state_change);
-
 static const struct of_device_id pwmss_of_match[] = {
 	{ .compatible	= "ti,am33xx-pwmss" },
 	{},
@@ -57,24 +31,10 @@ MODULE_DEVICE_TABLE(of, pwmss_of_match);
 static int pwmss_probe(struct platform_device *pdev)
 {
 	int ret;
-	struct resource *r;
-	struct pwmss_info *info;
 	struct device_node *node = pdev->dev.of_node;
 
-	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
-	if (!info)
-		return -ENOMEM;
-
-	mutex_init(&info->pwmss_lock);
-
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	info->mmio_base = devm_ioremap_resource(&pdev->dev, r);
-	if (IS_ERR(info->mmio_base))
-		return PTR_ERR(info->mmio_base);
-
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_get_sync(&pdev->dev);
-	platform_set_drvdata(pdev, info);
 
 	/* Populate all the child nodes here... */
 	ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
@@ -86,30 +46,21 @@ static int pwmss_probe(struct platform_device *pdev)
 
 static int pwmss_remove(struct platform_device *pdev)
 {
-	struct pwmss_info *info = platform_get_drvdata(pdev);
-
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-	mutex_destroy(&info->pwmss_lock);
 	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
 static int pwmss_suspend(struct device *dev)
 {
-	struct pwmss_info *info = dev_get_drvdata(dev);
-
-	info->pwmss_clkconfig = readw(info->mmio_base + PWMSS_CLKCONFIG);
 	pm_runtime_put_sync(dev);
 	return 0;
 }
 
 static int pwmss_resume(struct device *dev)
 {
-	struct pwmss_info *info = dev_get_drvdata(dev);
-
 	pm_runtime_get_sync(dev);
-	writew(info->pwmss_clkconfig, info->mmio_base + PWMSS_CLKCONFIG);
 	return 0;
 }
 #endif