linux-kernel - Re: [PATCH] spi: rockchip: support "sleep" pin configuration

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Date:   Sun, 18 Dec 2016 15:41:16 +0800
From:   Caesar Wang <wxt@...k-chips.com>
To:     Brian Norris <briannorris@...omium.org>,
        Mark Brown <broonie@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        Caesar Wang <wxt@...k-chips.com>
Subject: Re: [PATCH] spi: rockchip: support "sleep" pin configuration

在 2016年12月17日 08:59, Brian Norris 写道:
> In the pattern of many other devices, support a system-sleep pin
> configuration.
>
> Signed-off-by: Brian Norris <briannorris@...omium.org>

Tested-by: Caesar Wang <wxt@...k-chips.com>

> ---
>   Documentation/devicetree/bindings/spi/spi-rockchip.txt | 7 +++++++
>   drivers/spi/spi-rockchip.c                             | 5 +++++
>   2 files changed, 12 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/spi/spi-rockchip.txt b/Documentation/devicetree/bindings/spi/spi-rockchip.txt
> index d2ca153614f9..83da4931d832 100644
> --- a/Documentation/devicetree/bindings/spi/spi-rockchip.txt
> +++ b/Documentation/devicetree/bindings/spi/spi-rockchip.txt
> @@ -31,6 +31,10 @@ Optional Properties:
>   - rx-sample-delay-ns: nanoseconds to delay after the SCLK edge before sampling
>   		Rx data (may need to be fine tuned for high capacitance lines).
>   		No delay (0) by default.
> +- pinctrl-names: Names for the pin configuration(s); may be "default" or
> +		"sleep", where the "sleep" configuration may describe the state
> +		the pins should be in during system suspend. See also
> +		pinctrl/pinctrl-bindings.txt.
>   
>   
>   Example:
> @@ -46,4 +50,7 @@ Example:
>   		interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
>   		clocks = <&cru SCLK_SPI0>, <&cru PCLK_SPI0>;
>   		clock-names = "spiclk", "apb_pclk";
> +		pinctrl-0 = <&spi1_pins>;
> +		pinctrl-1 = <&spi1_sleep>;
> +		pinctrl-names = "default", "sleep";
>   	};
> diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
> index 0f89c2169c24..acf31f36b898 100644
> --- a/drivers/spi/spi-rockchip.c
> +++ b/drivers/spi/spi-rockchip.c
> @@ -17,6 +17,7 @@
>   #include <linux/dmaengine.h>
>   #include <linux/module.h>
>   #include <linux/of.h>
> +#include <linux/pinctrl/consumer.h>
>   #include <linux/platform_device.h>
>   #include <linux/spi/spi.h>
>   #include <linux/pm_runtime.h>
> @@ -843,6 +844,8 @@ static int rockchip_spi_suspend(struct device *dev)
>   		clk_disable_unprepare(rs->apb_pclk);
>   	}
>   
> +	pinctrl_pm_select_sleep_state(dev);
> +
>   	return ret;
>   }
>   
> @@ -852,6 +855,8 @@ static int rockchip_spi_resume(struct device *dev)
>   	struct spi_master *master = dev_get_drvdata(dev);
>   	struct rockchip_spi *rs = spi_master_get_devdata(master);
>   
> +	pinctrl_pm_select_default_state(dev);
> +
>   	if (!pm_runtime_suspended(dev)) {
>   		ret = clk_prepare_enable(rs->apb_pclk);
>   		if (ret < 0)