On 2017-07-12 03:02, Stephen Boyd wrote: > On the db410c 96boards platform we have a TC7USB40MU on the board > to mux the D+/D- lines coming from the controller between a micro > usb "device" port and a USB hub for "host" roles[1]. During a > role switch, we need to toggle this mux to forward the D+/D- > lines to either the port or the hub. Add the necessary code to do > the role switch in chipidea core via the generic mux framework. > Board configurations like on db410c are expected to change roles > via the sysfs API described in > Documentation/ABI/testing/sysfs-platform-chipidea-usb2. > > [1] https://github.com/96boards/documentation/raw/master/ConsumerEdition/DragonBoard-410c/HardwareDocs/Schematics_DragonBoard.pdf > > Cc: Peter Rosin <peda@xxxxxxxxxx> > Cc: Peter Chen <peter.chen@xxxxxxx> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Cc: <devicetree@xxxxxxxxxxxxxxx> > Signed-off-by: Stephen Boyd <stephen.boyd@xxxxxxxxxx> > --- > Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 8 ++++++++ > drivers/usb/chipidea/core.c | 17 +++++++++++++++++ > drivers/usb/chipidea/host.c | 10 ++++++++++ > drivers/usb/chipidea/udc.c | 11 +++++++++++ > include/linux/usb/chipidea.h | 14 ++++++++++++++ > 5 files changed, 60 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > index 0e03344e2e8b..96ce81d975d5 100644 > --- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > @@ -76,6 +76,11 @@ Optional properties: > needs to make sure it does not send more than 90% > maximum_periodic_data_per_frame. The use case is multiple transactions, but > less frame rate. > +- mux-controls: The mux control for toggling host/device output of this > + controller. > +- mux-control-names: Shall be "usb_switch" if mux-controls is specified. > +- usb-switch-states: Two u32's defining the state to set on the mux for the > + host mode and device modes respectively. > > i.mx specific properties > - fsl,usbmisc: phandler of non-core register device, with one > @@ -102,4 +107,7 @@ Example: > rx-burst-size-dword = <0x10>; > extcon = <0>, <&usb_id>; > phy-clkgate-delay-us = <400>; > + mux-controls = <&usb_switch>; > + mux-control-names = "usb_switch"; > + usb-switch-states = <0>, <1>; I don't see the need for usb-switch-states? Just assume states 0/1 and if someone later needs some other states, make them add a property that overrides the defaults. Just document that 0 is host and 1 is device. > }; > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c > index b17ed3a9a304..6531d771f296 100644 > --- a/drivers/usb/chipidea/core.c > +++ b/drivers/usb/chipidea/core.c > @@ -64,6 +64,7 @@ > #include <linux/of.h> > #include <linux/regulator/consumer.h> > #include <linux/usb/ehci_def.h> > +#include <linux/mux/consumer.h> > > #include "ci.h" > #include "udc.h" > @@ -606,6 +607,7 @@ static int ci_get_platdata(struct device *dev, > { > struct extcon_dev *ext_vbus, *ext_id; > struct ci_hdrc_cable *cable; > + struct ci_hdrc_switch *usb_switch; > int ret; > > if (!platdata->phy_mode) > @@ -690,6 +692,21 @@ static int ci_get_platdata(struct device *dev, > if (of_find_property(dev->of_node, "non-zero-ttctrl-ttha", NULL)) > platdata->flags |= CI_HDRC_SET_NON_ZERO_TTHA; > > + if (IS_ENABLED(CONFIG_MULTIPLEXER)) { > + usb_switch = &platdata->usb_switch; > + usb_switch->mux = devm_mux_control_get(dev, "usb_switch"); > + if (!IS_ERR(usb_switch->mux)) { > + if (of_property_read_u32_index(dev->of_node, > + "usb-switch-states", > + 0, &usb_switch->device)) > + return -EINVAL; > + if (of_property_read_u32_index(dev->of_node, > + "usb-switch-states", > + 1, &usb_switch->host)) > + return -EINVAL; > + } > + } > + > ext_id = ERR_PTR(-ENODEV); > ext_vbus = ERR_PTR(-ENODEV); > if (of_property_read_bool(dev->of_node, "extcon")) { > diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c > index 18cb8e46262d..9fd23ecc2da3 100644 > --- a/drivers/usb/chipidea/host.c > +++ b/drivers/usb/chipidea/host.c > @@ -25,6 +25,7 @@ > #include <linux/usb/hcd.h> > #include <linux/usb/chipidea.h> > #include <linux/regulator/consumer.h> > +#include <linux/mux/consumer.h> > > #include "../host/ehci.h" > > @@ -123,6 +124,13 @@ static int host_start(struct ci_hdrc *ci) > if (usb_disabled()) > return -ENODEV; > > + if (!IS_ERR(ci->platdata->usb_switch.mux)) { > + ret = mux_control_select(ci->platdata->usb_switch.mux, > + ci->platdata->usb_switch.host); > + if (ret) > + return ret; > + } > + You *must* call mux_control_deselect to clean up if there is a failure later in host_start. Is that handled in some non-obvious way? > hcd = __usb_create_hcd(&ci_ehci_hc_driver, ci->dev->parent, > ci->dev, dev_name(ci->dev), NULL); > if (!hcd) > @@ -205,6 +213,8 @@ static void host_stop(struct ci_hdrc *ci) > if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) && > (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON)) > regulator_disable(ci->platdata->reg_vbus); > + if (!IS_ERR(ci->platdata->usb_switch.mux)) > + mux_control_deselect(ci->platdata->usb_switch.mux); > } > ci->hcd = NULL; > ci->otg.host = NULL; > diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c > index d68b125796f9..ab3355905740 100644 > --- a/drivers/usb/chipidea/udc.c > +++ b/drivers/usb/chipidea/udc.c > @@ -22,6 +22,7 @@ > #include <linux/usb/gadget.h> > #include <linux/usb/otg-fsm.h> > #include <linux/usb/chipidea.h> > +#include <linux/mux/consumer.h> > > #include "ci.h" > #include "udc.h" > @@ -1899,6 +1900,13 @@ static int udc_start(struct ci_hdrc *ci) > ci->gadget.name = ci->platdata->name; > ci->gadget.otg_caps = otg_caps; > > + if (!IS_ERR(ci->platdata->usb_switch.mux)) { > + retval = mux_control_select(ci->platdata->usb_switch.mux, > + ci->platdata->usb_switch.device); > + if (retval) > + return retval; > + } > + Dito. Cheers, peda > if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support || > otg_caps->adp_support)) > ci->gadget.is_otg = 1; > @@ -1982,6 +1990,9 @@ static void udc_id_switch_for_host(struct ci_hdrc *ci) > hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS); > > ci->vbus_active = 0; > + > + if (!IS_ERR(ci->platdata->usb_switch.mux)) > + mux_control_deselect(ci->platdata->usb_switch.mux); > } > > /** > diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h > index c5fdfcf99828..559bd470b8c0 100644 > --- a/include/linux/usb/chipidea.h > +++ b/include/linux/usb/chipidea.h > @@ -9,6 +9,7 @@ > #include <linux/usb/otg.h> > > struct ci_hdrc; > +struct mux_control; > > /** > * struct ci_hdrc_cable - structure for external connector cable state tracking > @@ -29,6 +30,18 @@ struct ci_hdrc_cable { > struct notifier_block nb; > }; > > +/** > + * struct ci_hdrc_switch - structure for usb mux control > + * @mux: mux to set @host state or @device state on during role switch > + * @host: Value to set for mux to connect D+/D- to host D+/D- lines > + * @device: Value to set for mux to connect D+/D- to device D+/D- lines > + */ > +struct ci_hdrc_switch { > + struct mux_control *mux; > + int host; > + int device; > +}; > + > struct ci_hdrc_platform_data { > const char *name; > /* offset of the capability registers */ > @@ -74,6 +87,7 @@ struct ci_hdrc_platform_data { > /* VBUS and ID signal state tracking, using extcon framework */ > struct ci_hdrc_cable vbus_extcon; > struct ci_hdrc_cable id_extcon; > + struct ci_hdrc_switch usb_switch; > u32 phy_clkgate_delay_us; > }; > > -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
