On Thu, Nov 08, 2012 at 01:23:15PM +0530, Philip, Avinash wrote:
> Some platforms (like AM33XX) requires clock gating from control module
> explicitly for TBCLK. Enabling of this clock required for the
> functioning of the time base sub module in EHRPWM module. So adding
> optional TBCLK handling if DT node populated with tbclkgating. This
> helps the driver can coexist for Davinci platforms.
>
> Signed-off-by: Philip, Avinash <avinashphilip@xxxxxx>
> Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
> Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
> Cc: Rob Landley <rob@xxxxxxxxxxx>
> ---
> Changes since v1:
> - Moved TBCLK enable from probe to .pwm_enable & disable from
> remove to .pwm_disable
>
> :100644 100644 07911e6... 927a8ed... M drivers/pwm/pwm-tiehrpwm.c
> drivers/pwm/pwm-tiehrpwm.c | 22 ++++++++++++++++++++++
> 1 files changed, 22 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
> index 07911e6..927a8ed 100644
> --- a/drivers/pwm/pwm-tiehrpwm.c
> +++ b/drivers/pwm/pwm-tiehrpwm.c
> @@ -126,6 +126,7 @@ struct ehrpwm_pwm_chip {
> void __iomem *mmio_base;
> unsigned long period_cycles[NUM_PWM_CHANNEL];
> enum pwm_polarity polarity[NUM_PWM_CHANNEL];
> + struct clk *tbclk;
> };
>
> static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip)
> @@ -346,6 +347,13 @@ static int ehrpwm_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
> /* Channels polarity can be configured from action qualifier module */
> configure_polarity(pc, pwm->hwpwm);
>
> + /*
> + * Platforms require explicit clock enabling of TBCLK has
> + * to enable TBCLK explicitly before enabling PWM device
> + */
> + if (pc->tbclk)
> + clk_enable(pc->tbclk);
> +
> /* Enable time counter for free_run */
> ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_FREE_RUN);
> return 0;
> @@ -374,6 +382,10 @@ static void ehrpwm_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
>
> ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val);
>
> + /* Disabling TBCLK on PWM disable */
> + if (pc->tbclk)
> + clk_disable(pc->tbclk);
> +
> /* Stop Time base counter */
> ehrpwm_modify(pc->mmio_base, TBCTL, TBCTL_RUN_MASK, TBCTL_STOP_NEXT);
>
> @@ -464,6 +476,16 @@ static int __devinit ehrpwm_pwm_probe(struct platform_device *pdev)
> dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
> return ret;
> }
> +
> + /* Some platforms require explicit tbclk gating */
> + if (of_property_read_bool(pdev->dev.of_node, "tbclkgating")) {
Is it really necessary to have an extra boolean property for this?
Couldn't this just be handled by not defining a clock for the tbclk
consumer in board setup/DT
> + pc->tbclk = clk_get(&pdev->dev, "tbclk");
You should be using devm_clk_get() or add a matching clk_put() in
.remove().
Thierry
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