linux-kernel - Re: [PATCH 2/2] pwm: pwm-tiecap: Low power sleep support

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Date:	Mon, 14 Jan 2013 08:10:34 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Philip Avinash <avinashphilip@...com>
Cc:	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	nsekhar@...com, gururaja.hebbar@...com
Subject: Re: [PATCH 2/2] pwm: pwm-tiecap: Low power sleep support

On Thu, Jan 10, 2013 at 06:33:44PM +0530, Philip Avinash wrote:
> In low power modes of AM33XX platforms, peripherals power is cut off.
> This patch supports low power sleep transition support for ECAP driver.
> 
> Signed-off-by: Philip Avinash <avinashphilip@...com>
> ---
>  drivers/pwm/pwm-tiecap.c |   44 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 44 insertions(+)
> 
> diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
> index 5cf016d..9dde1fe 100644
> --- a/drivers/pwm/pwm-tiecap.c
> +++ b/drivers/pwm/pwm-tiecap.c
> @@ -41,10 +41,17 @@
>  #define ECCTL2_SYNC_SEL_DISA	(BIT(7) | BIT(6))
>  #define ECCTL2_TSCTR_FREERUN	BIT(4)
>  
> +struct ecap_regs {
> +	u32	cap3;
> +	u32	cap4;
> +	u16	ecctl2;
> +};

Perhaps name this ecap_context for consistency with the EHRPWM driver?

> +void ecap_pwm_save_reg(struct ecap_pwm_chip *pc)
> +{
> +	pm_runtime_get_sync(pc->chip.dev);
> +	pc->ctx.ecctl2 = readw(pc->mmio_base + ECCTL2);
> +	pc->ctx.cap4 = readl(pc->mmio_base + CAP4);
> +	pc->ctx.cap3 = readl(pc->mmio_base + CAP3);
> +	pm_runtime_put_sync(pc->chip.dev);
> +}
> +
> +void ecap_pwm_restore_reg(struct ecap_pwm_chip *pc)
> +{
> +	writel(pc->ctx.cap3, pc->mmio_base + CAP3);
> +	writel(pc->ctx.cap4, pc->mmio_base + CAP4);
> +	writew(pc->ctx.ecctl2, pc->mmio_base + ECCTL2);
> +}

Then rename these ecap_pwm_{save,restore}_context()?

> +static int ecap_pwm_suspend(struct device *dev)
> +{
> +	struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
> +
> +	ecap_pwm_save_reg(pc);
> +	pm_runtime_put_sync(dev);
> +	return 0;
> +}
> +
> +static int ecap_pwm_resume(struct device *dev)
> +{
> +	struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
> +
> +	pm_runtime_get_sync(dev);
> +	ecap_pwm_restore_reg(pc);
> +	return 0;
> +}

Same comment as for the EHRPWM driver applies here.

Thierry

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