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, 29 deletions

diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index c791720d27b0..b5c6b0636893 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -27,8 +27,6 @@
 #include <linux/pm_runtime.h>
 #include <linux/of_device.h>
 
-#include "pwm-tipwmss.h"
-
 /* EHRPWM registers and bits definitions */
 
 /* Time base module registers */
@@ -439,7 +437,6 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
         struct resource *r;
         struct clk *clk;
         struct ehrpwm_pwm_chip *pc;
-        u16 status;
 
         pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
         if (!pc)
@@ -496,27 +493,9 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
         }
 
         pm_runtime_enable(&pdev->dev);
-        pm_runtime_get_sync(&pdev->dev);
-
-        status = pwmss_submodule_state_change(pdev->dev.parent,
-                        PWMSS_EPWMCLK_EN);
-        if (!(status & PWMSS_EPWMCLK_EN_ACK)) {
-                dev_err(&pdev->dev, "PWMSS config space clock enable failed\n");
-                ret = -EINVAL;
-                goto pwmss_clk_failure;
-        }
-
-        pm_runtime_put_sync(&pdev->dev);
 
         platform_set_drvdata(pdev, pc);
         return 0;
-
-pwmss_clk_failure:
-        pm_runtime_put_sync(&pdev->dev);
-        pm_runtime_disable(&pdev->dev);
-        pwmchip_remove(&pc->chip);
-        clk_unprepare(pc->tbclk);
-        return ret;
 }
 
 static int ehrpwm_pwm_remove(struct platform_device *pdev)
@@ -525,14 +504,6 @@ static int ehrpwm_pwm_remove(struct platform_device *pdev)
 
         clk_unprepare(pc->tbclk);
 
-        pm_runtime_get_sync(&pdev->dev);
-        /*
-         * Due to hardware misbehaviour, acknowledge of the stop_req
-         * is missing. Hence checking of the status bit skipped.
-         */
-        pwmss_submodule_state_change(pdev->dev.parent, PWMSS_EPWMCLK_STOP_REQ);
-        pm_runtime_put_sync(&pdev->dev);
-
         pm_runtime_put_sync(&pdev->dev);
         pm_runtime_disable(&pdev->dev);
         return pwmchip_remove(&pc->chip);