linux-kernel - Re: [PATCH] mmc: atmel-mci: adopt pinctrl support

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Message-ID: <CAPDyKFo_snpdU5EjW7-rAXSwqBt0mi9-oEYuNpONRAr_aKdiPw@mail.gmail.com>
Date:	Thu, 6 Nov 2014 10:41:26 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Wenyou Yang <wenyou.yang@...el.com>
Cc:	Chris Ball <chris@...ntf.net>, Kevin Hilman <khilman@...nel.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] mmc: atmel-mci: adopt pinctrl support

On 6 November 2014 09:52, Wenyou Yang <wenyou.yang@...el.com> wrote:
> Amend the atmel mci pin controller to optionally take a pin control
> handle and set the state of the pins to:
> - "default" on boot, resume and before performing an transfer.
> - "sleep" on suspend().
>
> This should make it possible to optimize energy usage for the pins
> both for the suspend/resume cycle.
>
> Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> ---
>  drivers/mmc/host/atmel-mci.c |    7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
> index 4df1599..eb4bfbc 100644
> --- a/drivers/mmc/host/atmel-mci.c
> +++ b/drivers/mmc/host/atmel-mci.c
> @@ -39,6 +39,7 @@
>  #include <linux/atmel_pdc.h>
>  #include <linux/pm.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/pinctrl/consumer.h>
>
>  #include <asm/cacheflush.h>
>  #include <asm/io.h>
> @@ -2385,6 +2386,8 @@ static int __init atmci_probe(struct platform_device *pdev)
>         int                             irq;
>         int                             ret, i;
>
> +       pinctrl_pm_select_default_state(&pdev->dev);

Not needed, it's already taken care of from driver core.

> +
>         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>         if (!regs)
>                 return -ENXIO;
> @@ -2568,6 +2571,8 @@ static int atmci_runtime_suspend(struct device *dev)
>
>         clk_disable_unprepare(host->mck);
>
> +       pinctrl_pm_select_sleep_state(dev);
> +
>         return 0;
>  }
>
> @@ -2575,6 +2580,8 @@ static int atmci_runtime_resume(struct device *dev)
>  {
>         struct atmel_mci *host = dev_get_drvdata(dev);
>
> +       pinctrl_pm_select_default_state(dev);
> +
>         return clk_prepare_enable(host->mck);
>  }
>  #endif
> --
> 1.7.9.5
>

Kind regards
Uffe
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