On Wed, Oct 23, 2013 at 05:04:44PM +0800, Shawn Guo wrote:
> On Wed, Oct 23, 2013 at 02:46:04PM +0800, Peter Chen wrote:
> > How about compare compatible string directly at probe?
> >
> > if (of_device_is_compatible(np, "fsl,imx6q-usbphy"))
> > mxs_phy->devtype = IMX6Q_USB_PHY;
> > else if ((of_device_is_compatible(np, "fsl,imx6sl-usbphy"))
> > mxs_phy->devtype = IMX6SL_USB_PHY;
> > else if (...)
> > ...;
>
> It can work, but in general, we should avoid unnecessary device tree
> lookup. I would suggest something like below.
>
> #define MXS_FLAGS_SUSPEND_ISSUE_1 BIT(0)
> #define MXS_FLAGS_SUSPEND_ISSUE_2 BIT(1)
> #define MXS_FLAGS_LINE_DISCONNECT BIT(2)
>
> struct mxs_phy_data {
> unsigned int flags;
> };
>
> struct mxs_phy {
> ...
> mxs_phy_data *data;
> };
>
> static struct mxs_phy_data imx6sl_usbphy_data = {
> .flags = MXS_FLAGS_LINE_DISCONNECT,
> };
>
> static struct mxs_phy_data imx6q_usbphy_data = {
> .flags = MXS_FLAGS_SUSPEND_ISSUE_2 | MXS_FLAGS_LINE_DISCONNECT,
> };
>
> static struct mxs_phy_data imx23_usbphy_data = {
> .flags = MXS_FLAGS_SUSPEND_ISSUE_1 | MXS_FLAGS_SUSPEND_ISSUE_2,
> };
>
> static const struct of_device_id mxs_phy_dt_ids[] = {
> { .compatible = "fsl,imx6sl-usbphy", .data = &imx6sl_usbphy_data, },
> { .compatible = "fsl,imx6q-usbphy", .data = &imx6q_usbphy_data, },
> { .compatible = "fsl,imx23-usbphy", .data = &imx23_usbphy_data, },
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
>
> Then you can check the flags for handling different cases. This would
> be more flexible and future proof.
>
Great, I will use that way at chipidea driver too.
--
Best Regards,
Peter Chen
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