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Date:	Wed, 17 Sep 2014 10:06:57 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Robin Gong <b38343@...escale.com>
CC:	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<kernel@...gutronix.de>, <sre@...nel.org>, <dbaryshkov@...il.com>,
	<dwmw2@...radead.org>, <grant.likely@...aro.org>,
	<linux@....linux.org.uk>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/3] power: reset: imx-snvs-poweroff: add power off
 driver for i.mx6

On Fri, Sep 12, 2014 at 04:48:58PM +0800, Robin Gong wrote:
> Add simple power off driver for i.mx6.
> 
> Signed-off-by: Robin Gong <b38343@...escale.com>
> ---
>  drivers/power/reset/Kconfig             |  6 +++
>  drivers/power/reset/Makefile            |  1 +
>  drivers/power/reset/imx-snvs-poweroff.c | 69 +++++++++++++++++++++++++++++++++
>  3 files changed, 76 insertions(+)
>  create mode 100644 drivers/power/reset/imx-snvs-poweroff.c
> 
> diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> index ca41523..c48d9ba 100644
> --- a/drivers/power/reset/Kconfig
> +++ b/drivers/power/reset/Kconfig
> @@ -45,6 +45,12 @@ config POWER_RESET_HISI
>  	help
>  	  Reboot support for Hisilicon boards.
>  
> +config POWER_RESET_IMX
> +	bool "IMX6 power-off driver"
> +	depends on POWER_RESET && SOC_IMX6
> +	help
> +	  Power off support for i.mx6 boards.
> +
>  config POWER_RESET_MSM
>  	bool "Qualcomm MSM power-off driver"
>  	depends on POWER_RESET && ARCH_QCOM
> diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
> index a42e70e..2524daf 100644
> --- a/drivers/power/reset/Makefile
> +++ b/drivers/power/reset/Makefile
> @@ -3,6 +3,7 @@ obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o
>  obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
>  obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
>  obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
> +obj-$(CONFIG_POWER_RESET_IMX) += imx-snvs-poweroff.o
>  obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
>  obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
>  obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
> diff --git a/drivers/power/reset/imx-snvs-poweroff.c b/drivers/power/reset/imx-snvs-poweroff.c
> new file mode 100644
> index 0000000..55603ba
> --- /dev/null
> +++ b/drivers/power/reset/imx-snvs-poweroff.c
> @@ -0,0 +1,69 @@
> +/* Power off driver for i.mx6
> + * Copyright (c) 2014, FREESCALE CORPORATION.  All rights reserved.
> + *
> + * based on msm-poweroff.c
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <linux/delay.h>

Is it really needed?

> +#include <linux/err.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
> +
> +#include <asm/system_misc.h>

Ditto

Shawn

> +
> +static void __iomem *snvs_base;
> +
> +static void do_imx_poweroff(void)
> +{
> +	u32 value = readl(snvs_base);
> +
> +	/* set TOP and DP_EN bit */
> +	writel(value | 0x60, snvs_base);
> +}
> +
> +static int imx_poweroff_probe(struct platform_device *pdev)
> +{
> +	snvs_base = of_iomap(pdev->dev.of_node, 0);
> +	if (!snvs_base) {
> +		dev_err(&pdev->dev, "failed to get memory\n");
> +		return -EIO;
> +	}
> +
> +	pm_power_off = do_imx_poweroff;
> +	return 0;
> +}
> +
> +static const struct of_device_id of_imx_poweroff_match[] = {
> +	{ .compatible = "fsl,sec-v4.0-poweroff", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, of_imx_poweroff_match);
> +
> +static struct platform_driver imx_poweroff_driver = {
> +	.probe = imx_poweroff_probe,
> +	.driver = {
> +		.name = "imx-snvs-poweroff",
> +		.of_match_table = of_match_ptr(of_imx_poweroff_match),
> +	},
> +};
> +
> +static int __init imx_poweroff_init(void)
> +{
> +	return platform_driver_register(&imx_poweroff_driver);
> +}
> +device_initcall(imx_poweroff_init);
> -- 
> 1.9.1
> 
--
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