[PATCH v7 06/14] usb: phy-mxs: Add anatop regmap

[Shawn Guo]

On Fri, Dec 20, 2013 at 03:52:02PM +0800, Peter Chen wrote:
> It is needed by imx6 SoC series, but not for imx23 and imx28.
> 
> Signed-off-by: Peter Chen <peter.chen at freescale.com>
> ---
>  drivers/usb/phy/phy-mxs-usb.c |   23 +++++++++++++++++++++--
>  1 files changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
> index 0c6f3bc..0ef930a 100644
> --- a/drivers/usb/phy/phy-mxs-usb.c
> +++ b/drivers/usb/phy/phy-mxs-usb.c
> @@ -21,6 +21,8 @@
>  #include <linux/err.h>
>  #include <linux/io.h>
>  #include <linux/of_device.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
>  
>  #define DRIVER_NAME "mxs_phy"
>  
> @@ -58,6 +60,9 @@
>   */
>  #define MXS_PHY_SENDING_SOF_TOO_FAST		BIT(2)
>  
> +/* The SoCs who have anatop module */
> +#define MXS_PHY_HAS_ANATOP			BIT(3)
> +
>  struct mxs_phy_data {
>  	unsigned int flags;
>  };
> @@ -68,11 +73,13 @@ static const struct mxs_phy_data imx23_phy_data = {
>  
>  static const struct mxs_phy_data imx6q_phy_data = {
>  	.flags = MXS_PHY_SENDING_SOF_TOO_FAST |
> -		MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS,
> +		MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
> +		MXS_PHY_HAS_ANATOP,
>  };
>  
>  static const struct mxs_phy_data imx6sl_phy_data = {
> -	.flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS,
> +	.flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
> +		MXS_PHY_HAS_ANATOP,
>  };
>  
>  static const struct of_device_id mxs_phy_dt_ids[] = {
> @@ -87,6 +94,7 @@ struct mxs_phy {
>  	struct usb_phy phy;
>  	struct clk *clk;
>  	const struct mxs_phy_data *data;
> +	struct regmap *regmap_anatop;
>  };
>  
>  static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
> @@ -190,6 +198,7 @@ static int mxs_phy_probe(struct platform_device *pdev)
>  	int ret;
>  	const struct of_device_id *of_id =
>  			of_match_device(mxs_phy_dt_ids, &pdev->dev);
> +	struct device_node *np = pdev->dev.of_node;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	base = devm_ioremap_resource(&pdev->dev, res);
> @@ -226,6 +235,16 @@ static int mxs_phy_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, mxs_phy);
>  
> +	if (mxs_phy->data->flags & MXS_PHY_HAS_ANATOP) {
> +		mxs_phy->regmap_anatop = syscon_regmap_lookup_by_phandle
> +			(np, "fsl,anatop");
> +		if (IS_ERR(mxs_phy->regmap_anatop)) {
> +			dev_dbg(&pdev->dev,
> +				"failed to find regmap for anatop\n");
> +			return PTR_ERR(mxs_phy->regmap_anatop);

I'm looking at the merge dependency that Felipe mentions, and just think
of the DTB compatibility thing.  Does the above code mean that USB will
be broken if someone runs the new kernel with an old DTB on his board?

We're entering the stage where we need to maintain the DTB compatibility
in kernel.  That said, if users choose to upgrade their kernel only
(running with an old DTB), it's okay we do not give them new
features, but we shouldn't cause any regression/breakage for them.

Shawn

> +		}
> +	}
> +
>  	ret = usb_add_phy_dev(&mxs_phy->phy);
>  	if (ret)
>  		return ret;
> -- 
> 1.7.8
> 
>