[Patch v2 02/14] usb: phy-mxs: Add platform judgement code

[Shawn Guo]

On Tue, Oct 22, 2013 at 01:58:36PM +0800, Peter Chen wrote:
> The mxs-phy has three versions until now, each versions have
> some differences among PHY operations. the 1st version is
> for mx23/mx28 SoC, The 2nd version is for mx6q and mx6dl, the
> 3rd version is for mx6sl and later mx6 platform.
> 
> Signed-off-by: Peter Chen <peter.chen at freescale.com>
> ---
>  drivers/usb/phy/phy-mxs-usb.c |   65 ++++++++++++++++++++++++++++++++++++-----
>  1 files changed, 57 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
> index fdd33b4..a0628d6 100644
> --- a/drivers/usb/phy/phy-mxs-usb.c
> +++ b/drivers/usb/phy/phy-mxs-usb.c
> @@ -1,5 +1,5 @@
>  /*
> - * Copyright 2012 Freescale Semiconductor, Inc.
> + * Copyright 2012-2013 Freescale Semiconductor, Inc.
>   * Copyright (C) 2012 Marek Vasut <marex at denx.de>
>   * on behalf of DENX Software Engineering GmbH
>   *
> @@ -20,6 +20,7 @@
>  #include <linux/delay.h>
>  #include <linux/err.h>
>  #include <linux/io.h>
> +#include <linux/of_device.h>
>  
>  #define DRIVER_NAME "mxs_phy"
>  
> @@ -34,12 +35,57 @@
>  #define BM_USBPHY_CTRL_ENUTMILEVEL2		BIT(14)
>  #define BM_USBPHY_CTRL_ENHOSTDISCONDETECT	BIT(1)
>  
> +#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
> +
> +enum imx_phy_type {
> +	IMX6Q_USB_PHY,
> +	IMX6SL_USB_PHY,
> +	IMX23_USB_PHY,
> +};
> +
>  struct mxs_phy {
>  	struct usb_phy phy;
>  	struct clk *clk;
> +	enum imx_phy_type devtype;
>  };
>  
> -#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
> +static inline int is_mx6q_phy(struct mxs_phy *data)
> +{
> +	return data->devtype == IMX6Q_USB_PHY;
> +}
> +
> +static inline int is_mx6sl_phy(struct mxs_phy *data)
> +{
> +	return data->devtype == IMX6SL_USB_PHY;
> +}
> +
> +static inline int is_mx23_phy(struct mxs_phy *data)
> +{
> +	return data->devtype == IMX23_USB_PHY;
> +}
> +
> +static struct platform_device_id imx_phy_devtype[] = {
> +	{
> +		.name = "usb-phy-imx6q",
> +		.driver_data = IMX6Q_USB_PHY,
> +	}, {
> +		.name = "usb-phy-imx6sl",
> +		.driver_data = IMX6SL_USB_PHY,
> +	}, {
> +		.name = "usb-phy-imx23",
> +		.driver_data = IMX23_USB_PHY,
> +	}, {
> +		/* sentinel */
> +	}
> +};

I know many imx device drivers have this platform_device_id table, but
that's because they need to support both non-DT and DT probe.  Since
this driver supports DT probe only, we can save this table by passing
imx_phy_type value through of_device_id.data directly.

> +static const struct of_device_id mxs_phy_dt_ids[] = {
> +	{ .compatible = "fsl,imx6q-usbphy", .data = &imx_phy_devtype[IMX6Q_USB_PHY], },
> +	{ .compatible = "fsl,imx6sl-usbphy", .data = &imx_phy_devtype[IMX6SL_USB_PHY], },
> +	{ .compatible = "fsl,imx23-usbphy", .data = &imx_phy_devtype[IMX23_USB_PHY], },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
>  
>  static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
>  {
> @@ -131,6 +177,14 @@ static int mxs_phy_probe(struct platform_device *pdev)
>  	struct clk *clk;
>  	struct mxs_phy *mxs_phy;
>  	int ret;
> +	const struct of_device_id *of_id =
> +			of_match_device(mxs_phy_dt_ids, &pdev->dev);
> +
> +	/* This driver is DT-only version now */
> +	if (!of_id)
> +		return -ENXIO;

Since it's DT-only, I'm not sure you will run into the case that
mxs_phy_probe() is called with a NULL of_id.  The check looks
unnecessary to me.

> +
> +	pdev->id_entry = of_id->data;

Some imx device drivers did the same thing, but we should keep
pdev->id_entry immutable.  The removal of that platform_device_id table
will help save this.

Shawn

>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	base = devm_ioremap_resource(&pdev->dev, res);
> @@ -163,6 +217,7 @@ static int mxs_phy_probe(struct platform_device *pdev)
>  	ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);
>  
>  	mxs_phy->clk = clk;
> +	mxs_phy->devtype = pdev->id_entry->driver_data;
>  
>  	platform_set_drvdata(pdev, &mxs_phy->phy);
>  
> @@ -182,12 +237,6 @@ static int mxs_phy_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static const struct of_device_id mxs_phy_dt_ids[] = {
> -	{ .compatible = "fsl,imx23-usbphy", },
> -	{ /* sentinel */ }
> -};
> -MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
> -
>  static struct platform_driver mxs_phy_driver = {
>  	.probe = mxs_phy_probe,
>  	.remove = mxs_phy_remove,
> -- 
> 1.7.1
> 
>