Re: [PATCH v2 2/3] power: reset: imx-snvs-poweroff: add power off driver for i.mx6

[Robin Gong]

On Wed, Sep 17, 2014 at 10:06:57AM +0800, Shawn Guo wrote:
> 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@xxxxxxxxxxxxx>
> > ---
> >  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
>
Yes, will remove both.
> > +
> > +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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