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authorCooper Jr., Franklin <fcooper@ti.com>2016-03-07 13:33:56 -0600
committerThierry Reding <thierry.reding@gmail.com>2016-07-11 12:07:18 +0200
commitcc37655e6bbf83ded1e4d1d7ffd977786a845a67 (patch)
tree2edeb564a96d7694122764fa745546a4519465af /drivers/pwm/pwm-tiecap.c
parentae5200d2271691b28aff8d0409fbefd4644ff507 (diff)
downloadlinux-cc37655e6bbf83ded1e4d1d7ffd977786a845a67.tar.bz2
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>
Diffstat (limited to 'drivers/pwm/pwm-tiecap.c')
-rw-r--r--drivers/pwm/pwm-tiecap.c28
1 files changed, 0 insertions, 28 deletions
diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 0dc5b97a7524..6ec342dd3eea 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -27,8 +27,6 @@
#include <linux/pwm.h>
#include <linux/of_device.h>
-#include "pwm-tipwmss.h"
-
/* ECAP registers and bits definitions */
#define CAP1 0x08
#define CAP2 0x0C
@@ -208,7 +206,6 @@ static int ecap_pwm_probe(struct platform_device *pdev)
struct resource *r;
struct clk *clk;
struct ecap_pwm_chip *pc;
- u16 status;
pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
if (!pc)
@@ -252,40 +249,15 @@ static int ecap_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_ECAPCLK_EN);
- if (!(status & PWMSS_ECAPCLK_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);
- return ret;
}
static int ecap_pwm_remove(struct platform_device *pdev)
{
struct ecap_pwm_chip *pc = platform_get_drvdata(pdev);
- 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_ECAPCLK_STOP_REQ);
- pm_runtime_put_sync(&pdev->dev);
-
pm_runtime_disable(&pdev->dev);
return pwmchip_remove(&pc->chip);
}