On Tue, Jul 07, 2015 at 04:23:14PM +0300, Roger Quadros wrote: > Hi, > > On 29/06/15 10:47, Li Jun wrote: > >Check property of usb hardware to update otg version and disable SRP, HNP > >and ADP if its disable flag is present. > > > >Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx> > >--- > > drivers/usb/common/common.c | 47 +++++++++++++++++++++++++++++++++++++++++++++ > > include/linux/usb/of.h | 7 +++++++ > > 2 files changed, 54 insertions(+) > > > >diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c > >index b530fd4..10c986b 100644 > >--- a/drivers/usb/common/common.c > >+++ b/drivers/usb/common/common.c > >@@ -154,6 +154,53 @@ bool of_usb_host_tpl_support(struct device_node *np) > > return false; > > } > > EXPORT_SYMBOL_GPL(of_usb_host_tpl_support); > >+ > >+/** > >+ * of_usb_update_otg_caps - to update usb otg capabilities according to > >+ * the passed properties in DT. > >+ * @np: Pointer to the given device_node > >+ * @otg_caps: Pointer to the target usb_otg_caps to be set > >+ * > >+ * The function updates the otg capabilities > >+ */ > >+int of_usb_update_otg_caps(struct device_node *np, > >+ struct usb_otg_caps *otg_caps) > >+{ > >+ u32 otg_rev; > >+ > >+ if (!otg_caps) > >+ return -EINVAL; > >+ > >+ if (!of_property_read_u32(np, "otg-rev", &otg_rev)) { > >+ switch (otg_rev) { > >+ case 0x0100: > >+ case 0x0120: > >+ case 0x0130: > >+ case 0x0200: > >+ case 0x0300: > > we don't support 0x300 yet. I guess it is best to leave it out till > we have real otg 3.0 support. > okay. > >+ otg_caps->otg_rev = otg_rev; > >+ break; > >+ default: > >+ pr_err("%s: unsupported otg-rev: 0x%x\n", > >+ np->full_name, otg_rev); > >+ return -EINVAL; > >+ } > >+ } else { > >+ otg_caps->otg_rev = 0; > > Why do we set this to 0 here? > controller might have set a valid otg_rev and we want to > maintain it if nothing was passed in DT. > Considering otg-rev is mandatory for non-legacy platformsr, Now you mean what I did in previous version: do not set initial otg-rev in controller driver, just let it to be 0, and wait it to be updated by DT or by platform layer code. Current idea is: set otg capabilities in controller driver as otg _ability_ like below: otg-rev = 0x0200; hnp_support = true; a) Call to this function to update otg caps if pass by DT, and then/or b) Update otg caps if some platforms want to update it directly(not by DT). If both above 2 update not happen, then I need keep otg-rev to be 0 which will be used to judge this is a legacy platform, so I set otg-rev to be 0 if it not passed in DT in a). We also can do this like my previous version: In controller driver, only set HNP/SRP/ADP as otg ability: hnp_support = true; a) Call to this function to update otg caps if pass by DT, and then/or b) Update otg caps if some platforms want to update it directly(not by DT). If both above 2 update not happen, otg-rev is still 0, so I need not set it to be 0 if nothing pass in DT. Either way is okay I think. Li Jun > >+ } > >+ > >+ if (of_find_property(np, "hnp-disable", NULL)) > >+ otg_caps->hnp_support = false; > >+ if (of_find_property(np, "srp-disable", NULL)) > >+ otg_caps->srp_support = false; > >+ if (of_find_property(np, "adp-disable", NULL) || > >+ (otg_caps->otg_rev < 0x0200)) > >+ otg_caps->adp_support = false; > >+ > >+ return 0; > >+} > >+EXPORT_SYMBOL_GPL(of_usb_update_otg_caps); > >+ > > #endif > > cheers, > -roger > > > > > MODULE_LICENSE("GPL"); > >diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h > >index cfe0528..8c5a818 100644 > >--- a/include/linux/usb/of.h > >+++ b/include/linux/usb/of.h > >@@ -15,6 +15,8 @@ > > enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np); > > enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np); > > bool of_usb_host_tpl_support(struct device_node *np); > >+int of_usb_update_otg_caps(struct device_node *np, > >+ struct usb_otg_caps *otg_caps); > > #else > > static inline enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np) > > { > >@@ -30,6 +32,11 @@ static inline bool of_usb_host_tpl_support(struct device_node *np) > > { > > return false; > > } > >+static inline int of_usb_update_otg_caps(struct device_node *np, > >+ struct usb_otg_caps *otg_caps) > >+{ > >+ return 0; > >+} > > #endif > > > > #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT) > > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html