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pwm: i.MX: use per clock unconditionally 

The i.MX PWM module has two clocks: The ipg clock and the ipg highfreq
(peripheral) clock. The ipg clock has to be enabled for this hardware
to work. The actual PWM output can either be driven by the ipg clock
or the ipg highfreq. The ipg highfreq has the advantage that it runs
even when the SoC is in low power modes.
Use the always running clock also on i.MX25.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
hifive-unleashed-5.1
Sascha Hauer 2012-08-28 12:03:29 +02:00 committed by Thierry Reding
parent 479e2e301c
commit 8d1c24bfd2
1 changed files with 1 additions and 7 deletions
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8
drivers/pwm/pwm-imx.c
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@ -17,7 +17,6 @@
#include <linux/io.h>
#include <linux/pwm.h>
#include <linux/of_device.h>
#include <mach/hardware.h>
/* i.MX1 and i.MX21 share the same PWM function block: */
@ -133,16 +132,11 @@ static int imx_pwm_config_v2(struct pwm_chip *chip,
cr = MX3_PWMCR_PRESCALER(prescale) |
MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN |
MX3_PWMCR_DBGEN;
MX3_PWMCR_DBGEN | MX3_PWMCR_CLKSRC_IPG_HIGH;
if (imx->enabled)
cr |= MX3_PWMCR_EN;
if (cpu_is_mx25())
cr |= MX3_PWMCR_CLKSRC_IPG;
else
cr |= MX3_PWMCR_CLKSRC_IPG_HIGH;
writel(cr, imx->mmio_base + MX3_PWMCR);
return 0;