Re: [PATCH v3 2/3] power: reset: imx-snvs-poweroff: add power off driver for i.mx6

[Robin Gong]

On Wed, Sep 17, 2014 at 06:52:44PM +0100, Mark Rutland wrote:
> On Wed, Sep 17, 2014 at 10:57:59AM +0100, Robin Gong wrote:
> > This driver register pm_power_off with snvs power off function. If
> > your boards NOT use PMIC_ON_REQ to turn on/off external pmic, or use
> > other pin to do, please disable the driver in dts, otherwise, your
> > pm_power_off maybe overwrote by this driver.
> > 
> > Signed-off-by: Robin Gong <b38343@xxxxxxxxxxxxx>
> > ---
> >  .../bindings/power_supply/imx-snvs-poweroff.txt    |   23 +++++++
> >  drivers/power/reset/Kconfig                        |    9 +++
> >  drivers/power/reset/Makefile                       |    1 +
> >  drivers/power/reset/imx-snvs-poweroff.c            |   66 ++++++++++++++++++++
> >  4 files changed, 99 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/power_supply/imx-snvs-poweroff.txt
> >  create mode 100644 drivers/power/reset/imx-snvs-poweroff.c
> > 
> > diff --git a/Documentation/devicetree/bindings/power_supply/imx-snvs-poweroff.txt b/Documentation/devicetree/bindings/power_supply/imx-snvs-poweroff.txt
> > new file mode 100644
> > index 0000000..6caf64e
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/power_supply/imx-snvs-poweroff.txt
> > @@ -0,0 +1,23 @@
> > +i.mx6 Poweroff Driver
> > +
> > +SNVS_LPCR in SNVS module can power off the whole system by pull
> > +PMIC_ON_REQ low if PMIC_ON_REQ is connected with external PMIC.
> > +If you don't want to use PMIC_ON_REQ as power on/off control,
> > +please set status='disabled' to disable this driver.
> > +
> > +Required Properties:
> > +-compatible: "fsl,sec-v4.0-poweroff"
> > +-reg: Specifies the physical address of the SNVS_LPCR register
> 
> As you describe above, this is part of the SNVS module. So why does this
> need a separate node?
> 
> Surely there should just be a property on the SNVS node that desribers
> whether or not this can be used?
> 
> Mark.
>
Yes, put this function in rtc-snvs make things easier, honestly,this is our way
in internal tree. But looks more and more power off driver put in drivers/power
/reset,so we decided to add new power off driver. If it is ok to register
pm_power_off hook in drivers/rtc/rtc-snvs.c, I can drop this patch.
> > +
> > +Example:
> > +	snvs@020cc000 {
> > +		compatible = "fsl,sec-v4.0-mon", "simple-bus";
> > +		#address-cells = <1>;
> > +		#size-cells = <1>;
> > +		ranges = <0 0x020cc000 0x4000>;
> > +		.....
> > +		snvs-poweroff@38 {
> > +			compatible = "fsl,sec-v4.0-poweroff";
> > +			reg = <0x38 0x4>;
> > +		};
> > +	}
> > diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
> > index ca41523..b26c547 100644
> > --- a/drivers/power/reset/Kconfig
> > +++ b/drivers/power/reset/Kconfig
> > @@ -45,6 +45,15 @@ 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
> > +	  This driver support power off external PMIC by PMIC_ON_REQ on i.mx6
> > +	  boards.If you want to use other pin to control external power,please
> > +	  say N here or disable in dts to make sure pm_power_off never be
> > +	  overwrote wrongly by this driver.
> > +
> >  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..d726ac4
> > --- /dev/null
> > +++ b/drivers/power/reset/imx-snvs-poweroff.c
> > @@ -0,0 +1,66 @@
> > +/* 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/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>
> > +
> > +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);
> > -- 
> > 1.7.9.5
> > 
> > 
> 
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