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Date:	Thu, 6 Feb 2014 11:44:30 +0530
From:	Pratyush Anand <pratyush.anand@...com>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	"arnd@...db.de" <arnd@...db.de>,
	spear-devel <spear-devel@...t.st.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4 4/8] phy: st-miphy-40lp: Add skeleton driver

Hi Kishon,

On Thu, Feb 06, 2014 at 02:01:45PM +0800, Kishon Vijay Abraham I wrote:
> Hi,
> 
> On Thursday 06 February 2014 10:14 AM, Pratyush Anand wrote:
> > ST miphy-40lp supports PCIe, SATA and Super Speed USB. This driver adds
> > skeleton support for the same.
> > 
> > Currently phy ops are returning -EINVAL. They can be elaborated
> > depending on the SOC being supported in future.
> > 
> > Signed-off-by: Pratyush Anand <pratyush.anand@...com>
> > Tested-by: Mohit Kumar <mohit.kumar@...com>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Cc: Kishon Vijay Abraham I <kishon@...com>
> > Cc: spear-devel@...t.st.com
> > Cc: linux-arm-kernel@...ts.infradead.org
> > Cc: devicetree@...r.kernel.org
> > Cc: linux-kernel@...r.kernel.org
> > ---
> >  .../devicetree/bindings/phy/st-miphy40lp.txt       |  12 ++
> >  drivers/phy/Kconfig                                |   6 +
> >  drivers/phy/Makefile                               |   1 +
> >  drivers/phy/phy-miphy40lp.c                        | 174 +++++++++++++++++++++
> >  4 files changed, 193 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/phy/st-miphy40lp.txt
> >  create mode 100644 drivers/phy/phy-miphy40lp.c
> > 
> > diff --git a/Documentation/devicetree/bindings/phy/st-miphy40lp.txt b/Documentation/devicetree/bindings/phy/st-miphy40lp.txt
> > new file mode 100644
> > index 0000000..d0c7096
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/st-miphy40lp.txt
> > @@ -0,0 +1,12 @@
> > +Required properties:
> > +- compatible : should be "st,miphy40lp-phy"
> > +	Other supported soc specific compatible:
> > +		"st,spear1310-miphy"
> > +		"st,spear1340-miphy"
> > +- reg : offset and length of the PHY register set.
> > +- misc: phandle for the syscon node to access misc registers
> > +- phy-id: Instance id of the phy.
> > +- #phy-cells : from the generic PHY bindings, must be 1.
> > +	- 1st cell: phandle to the phy node.
> > +	- 2nd cell: 0 if phy (in 1st cell) is to be used for SATA, 1 for PCIe
> > +	  and 2 for Super Speed USB.
> > diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> > index afa2354..2f58993 100644
> > --- a/drivers/phy/Kconfig
> > +++ b/drivers/phy/Kconfig
> > @@ -64,4 +64,10 @@ config BCM_KONA_USB2_PHY
> >  	help
> >  	  Enable this to support the Broadcom Kona USB 2.0 PHY.
> >  
> > +config PHY_ST_MIPHY40LP
> > +	tristate "ST MIPHY 40LP driver"
> > +	help
> > +	  Support for ST MIPHY 40LP which can be used for PCIe, SATA and Super Speed USB.
> > +	select GENERIC_PHY
> > +
> >  endmenu
> > diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> > index b57c253..c061091 100644
> > --- a/drivers/phy/Makefile
> > +++ b/drivers/phy/Makefile
> > @@ -9,3 +9,4 @@ obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO)	+= phy-exynos-mipi-video.o
> >  obj-$(CONFIG_PHY_MVEBU_SATA)		+= phy-mvebu-sata.o
> >  obj-$(CONFIG_OMAP_USB2)			+= phy-omap-usb2.o
> >  obj-$(CONFIG_TWL4030_USB)		+= phy-twl4030-usb.o
> > +obj-$(CONFIG_PHY_ST_MIPHY40LP)		+= phy-miphy40lp.o
> > diff --git a/drivers/phy/phy-miphy40lp.c b/drivers/phy/phy-miphy40lp.c
> > new file mode 100644
> > index 0000000..d478c14
> > --- /dev/null
> > +++ b/drivers/phy/phy-miphy40lp.c
> > @@ -0,0 +1,174 @@
> > +/*
> > + * ST MiPHY-40LP PHY driver
> > + *
> > + * Copyright (C) 2014 ST Microelectronics
> > + * Pratyush Anand <pratyush.anand@...com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/kernel.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/module.h>
> > +#include <linux/of_device.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/regmap.h>
> > +
> > +enum phy_mode {
> > +	SATA,
> > +	PCIE,
> > +	SS_USB,
> > +};
> > +
> > +struct st_miphy40lp_priv {
> > +	/* regmap for any soc specific misc registers */
> > +	struct regmap		*misc;
> > +	/* phy struct pointer */
> > +	struct phy		*phy;
> > +	/* device node pointer */
> > +	struct device_node	*np;
> > +	/* phy mode: 0 for SATA 1 for PCIe and 2 for SS-USB */
> > +	enum phy_mode		mode;
> > +	/* instance id of this phy */
> > +	u32			id;
> > +};
> > +
> > +static int miphy40lp_init(struct phy *phy)
> > +{
> > +	return -EINVAL;
> > +}
> > +
> > +static int miphy40lp_exit(struct phy *phy)
> > +{
> > +	return -EINVAL;
> > +}
> > +
> > +static int miphy40lp_power_off(struct phy *phy)
> > +{
> > +	return -EINVAL;
> > +}
> > +
> > +static int miphy40lp_power_on(struct phy *phy)
> > +{
> > +	return -EINVAL;
> > +}
> > +
> > +static const struct of_device_id st_miphy40lp_of_match[] = {
> > +	{ .compatible = "st,miphy40lp-phy" },
> > +	{ },
> > +};
> > +MODULE_DEVICE_TABLE(of, st_miphy40lp_of_match);
> > +
> > +static struct phy_ops st_miphy40lp_ops = {
> > +	.init = miphy40lp_init,
> > +	.exit = miphy40lp_exit,
> > +	.power_off = miphy40lp_power_off,
> > +	.power_on = miphy40lp_power_on,
> > +	.owner		= THIS_MODULE,
> 
> Would prefer to either align all the fields or align none. Here only owner is
> aligned.

ok.

> > +};
> > +
> > +#ifdef CONFIG_PM_SLEEP
> > +static int miphy40lp_suspend(struct device *dev)
> > +{
> > +	return -EINVAL;
> > +}
> > +
> > +static int miphy40lp_resume(struct device *dev)
> > +{
> > +	return -EINVAL;
> > +}
> > +#endif
> > +
> > +static SIMPLE_DEV_PM_OPS(miphy40lp_pm_ops, miphy40lp_suspend,
> > +		miphy40lp_resume);
> > +
> > +static struct phy *st_miphy40lp_xlate(struct device *dev,
> > +					struct of_phandle_args *args)
> > +{
> > +	struct st_miphy40lp_priv *phypriv = dev_get_drvdata(dev);
> > +
> > +	if (args->args_count < 1) {
> > +		dev_err(dev, "DT did not pass correct no of args\n");
> > +		return NULL;
> > +	}
> > +
> > +	phypriv->mode = args->args[0];
> > +
> > +	return phypriv->phy;
> > +}
> > +
> > +static int __init st_miphy40lp_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct st_miphy40lp_priv *phypriv;
> > +	struct phy_provider *phy_provider;
> > +
> > +	phypriv = devm_kzalloc(dev, sizeof(*phypriv), GFP_KERNEL);
> > +	if (!phypriv) {
> > +		dev_err(dev, "can't alloc miphy40lp private date memory\n");
> > +		return -ENOMEM;
> > +	}
> > +
> > +	phypriv->np = dev->of_node;
> > +
> > +	phypriv->misc =
> > +		syscon_regmap_lookup_by_phandle(dev->of_node, "misc");
> > +	if (IS_ERR(phypriv->misc)) {
> > +		dev_err(dev, "failed to find misc regmap\n");
> > +		return PTR_ERR(phypriv->misc);
> > +	}
> > +
> > +	if (of_property_read_u32(dev->of_node, "phy-id", &phypriv->id)) {
> > +		dev_err(dev, "failed to find phy id\n");
> > +		return -EINVAL;
> > +	}
> Do we really need this phy id? How is it being used?

Yes , it is being used by patch 6/8.

> 
> > +
> > +	phy_provider = devm_of_phy_provider_register(dev, st_miphy40lp_xlate);
> > +	if (IS_ERR(phy_provider)) {
> > +		dev_err(dev, "failed to register phy provider\n");
> > +		return PTR_ERR(phy_provider);
> > +	}
> 
> phy_provider_register should be the last step in registering the PHY. Or your
> PHY call backs can be called before you create the PHY. Btw in your case you

But every one else like  phy-exynos-mipi-video or phy-omap-usb2 or any
other did it same way. First phy_provider_register and then
phy_create.

> should call dev_set_drvdata before doing phy_provider_register.

yes, I need to correct it.

> > +
> > +	phypriv->phy = devm_phy_create(dev, &st_miphy40lp_ops, NULL);
> > +	if (IS_ERR(phypriv->phy)) {
> > +		dev_err(dev, "failed to create SATA PCIe PHY\n");
> > +		return PTR_ERR(phypriv->phy);
> > +	}
> > +
> > +	dev_set_drvdata(dev, phypriv);
> > +	phy_set_drvdata(phypriv->phy, phypriv);
> > +
> > +	return 0;
> > +}
> > +
> > +static int __exit st_miphy40lp_remove(struct platform_device *pdev)
> > +{
> > +	return 0;
> > +}
> 
> I think you can remove this empty 'remove' callback.

Yaa.. Can be removed.

Rgds
Pratyush
> 
> Thanks
> Kishon
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