| Message ID | 20220715073300.868087-3-alexander.stein@ew.tq-group.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2,1/3] dt-bindings: usb: Add binding for TI USB8041 hub controller | expand |
Am Freitag, 15. Juli 2022, 21:50:41 CEST schrieb Matthias Kaehlcke: > On Fri, Jul 15, 2022 at 09:33:00AM +0200, Alexander Stein wrote: > > This is a 4-port 3.0 USB hub. > > > > Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com> > > --- > > Changes in v2: > > * Add devtype data containing waiting times > > > > drivers/usb/misc/onboard_usb_hub.c | 3 +++ > > drivers/usb/misc/onboard_usb_hub.h | 7 +++++++ > > 2 files changed, 10 insertions(+) > > > > diff --git a/drivers/usb/misc/onboard_usb_hub.c > > b/drivers/usb/misc/onboard_usb_hub.c index 1dd7f4767def..319b4b1748fb > > 100644 > > --- a/drivers/usb/misc/onboard_usb_hub.c > > +++ b/drivers/usb/misc/onboard_usb_hub.c > > @@ -339,6 +339,7 @@ static struct platform_driver onboard_hub_driver = { > > > > /************************** USB driver **************************/ > > > > #define VENDOR_ID_REALTEK 0x0bda > > > > +#define VENDOR_ID_TI 0x0451 > > > > /* > > > > * Returns the onboard_hub platform device that is associated with the > > USB > > > > @@ -416,6 +417,8 @@ static const struct usb_device_id > > onboard_hub_id_table[] = {> > > { USB_DEVICE(VENDOR_ID_REALTEK, 0x5411) }, /* RTS5411 USB 2.1 */ > > { USB_DEVICE(VENDOR_ID_REALTEK, 0x0414) }, /* RTS5414 USB 3.2 */ > > { USB_DEVICE(VENDOR_ID_REALTEK, 0x5414) }, /* RTS5414 USB 2.1 */ > > > > + { USB_DEVICE(VENDOR_ID_TI, 0x8140) }, /* TI USB8041 3.0 */ > > + { USB_DEVICE(VENDOR_ID_TI, 0x8142) }, /* TI USB8041 2.0 */ > > > > {} > > > > }; > > MODULE_DEVICE_TABLE(usb, onboard_hub_id_table); > > > > diff --git a/drivers/usb/misc/onboard_usb_hub.h > > b/drivers/usb/misc/onboard_usb_hub.h index 7e743f4c8aaa..fcb6a9024bbd > > 100644 > > --- a/drivers/usb/misc/onboard_usb_hub.h > > +++ b/drivers/usb/misc/onboard_usb_hub.h > > @@ -11,7 +11,14 @@ struct onboard_hub_devtype_data { > > > > unsigned long reset_duration; /* reset pulse width in us */ > > > > }; > > > > +static const struct onboard_hub_devtype_data ti_tusb8041_data = { > > + .power_stable_time = 3000, > > + .reset_duration = 3000, > > Aren't these two values actually the same thing, i.e. the minimum > duration of the reset? > > From the data sheet: > > A minimum reset duration of 3 ms is required > > td2: VDD and VDD33 stable before de-assertion of GRSTz (>= 3ms) > > My understanding is that td2 is just another expression of the first > requirement. They may have the same values, but IMHO they are applied differently. 'power_stable_time' (or power_stable_us now) applies after supplying power, while 'reset_duration' (or reset_us now) applies when you deassert the reset line. For that reason I would like to keep them separated. Thanks and best regards, Alexander
On Wed, Jul 20, 2022 at 09:18:50AM +0200, Alexander Stein wrote: > Am Freitag, 15. Juli 2022, 21:50:41 CEST schrieb Matthias Kaehlcke: > > On Fri, Jul 15, 2022 at 09:33:00AM +0200, Alexander Stein wrote: > > > This is a 4-port 3.0 USB hub. > > > > > > Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com> > > > --- > > > Changes in v2: > > > * Add devtype data containing waiting times > > > > > > drivers/usb/misc/onboard_usb_hub.c | 3 +++ > > > drivers/usb/misc/onboard_usb_hub.h | 7 +++++++ > > > 2 files changed, 10 insertions(+) > > > > > > diff --git a/drivers/usb/misc/onboard_usb_hub.c > > > b/drivers/usb/misc/onboard_usb_hub.c index 1dd7f4767def..319b4b1748fb > > > 100644 > > > --- a/drivers/usb/misc/onboard_usb_hub.c > > > +++ b/drivers/usb/misc/onboard_usb_hub.c > > > @@ -339,6 +339,7 @@ static struct platform_driver onboard_hub_driver = { > > > > > > /************************** USB driver **************************/ > > > > > > #define VENDOR_ID_REALTEK 0x0bda > > > > > > +#define VENDOR_ID_TI 0x0451 > > > > > > /* > > > > > > * Returns the onboard_hub platform device that is associated with the > > > USB > > > > > > @@ -416,6 +417,8 @@ static const struct usb_device_id > > > onboard_hub_id_table[] = {> > > > { USB_DEVICE(VENDOR_ID_REALTEK, 0x5411) }, /* RTS5411 USB 2.1 */ > > > { USB_DEVICE(VENDOR_ID_REALTEK, 0x0414) }, /* RTS5414 USB 3.2 */ > > > { USB_DEVICE(VENDOR_ID_REALTEK, 0x5414) }, /* RTS5414 USB 2.1 */ > > > > > > + { USB_DEVICE(VENDOR_ID_TI, 0x8140) }, /* TI USB8041 3.0 */ > > > + { USB_DEVICE(VENDOR_ID_TI, 0x8142) }, /* TI USB8041 2.0 */ > > > > > > {} > > > > > > }; > > > MODULE_DEVICE_TABLE(usb, onboard_hub_id_table); > > > > > > diff --git a/drivers/usb/misc/onboard_usb_hub.h > > > b/drivers/usb/misc/onboard_usb_hub.h index 7e743f4c8aaa..fcb6a9024bbd > > > 100644 > > > --- a/drivers/usb/misc/onboard_usb_hub.h > > > +++ b/drivers/usb/misc/onboard_usb_hub.h > > > @@ -11,7 +11,14 @@ struct onboard_hub_devtype_data { > > > > > > unsigned long reset_duration; /* reset pulse width in > us */ > > > > > > }; > > > > > > +static const struct onboard_hub_devtype_data ti_tusb8041_data = { > > > + .power_stable_time = 3000, > > > + .reset_duration = 3000, > > > > Aren't these two values actually the same thing, i.e. the minimum > > duration of the reset? > > > > From the data sheet: > > > > A minimum reset duration of 3 ms is required > > > > td2: VDD and VDD33 stable before de-assertion of GRSTz (>= 3ms) > > > > My understanding is that td2 is just another expression of the first > > requirement. > > They may have the same values, but IMHO they are applied differently. > 'power_stable_time' (or power_stable_us now) applies after supplying power, > while 'reset_duration' (or reset_us now) applies when you deassert the reset > line. > For that reason I would like to keep them separated. In both cases the datasheet talks about the reset duration of 3 ms in relation with the power supplies: 7.6 Timing Requirements, Power-Up td2: VDD and VDD33 stable before de-assertion of GRSTz 8.3.7 Power-Up and Reset A minimum reset duration of 3 ms is required. This is defined as the time when the power supplies are in the recommended operating range to the de-assertion of GRSTz. At this point I see no good reason for having two different values. If it turns out later that it is really needed for other hubs another fiels like 'power_stable_us' can still be added.
diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c index 1dd7f4767def..319b4b1748fb 100644 --- a/drivers/usb/misc/onboard_usb_hub.c +++ b/drivers/usb/misc/onboard_usb_hub.c @@ -339,6 +339,7 @@ static struct platform_driver onboard_hub_driver = { /************************** USB driver **************************/ #define VENDOR_ID_REALTEK 0x0bda +#define VENDOR_ID_TI 0x0451 /* * Returns the onboard_hub platform device that is associated with the USB @@ -416,6 +417,8 @@ static const struct usb_device_id onboard_hub_id_table[] = { { USB_DEVICE(VENDOR_ID_REALTEK, 0x5411) }, /* RTS5411 USB 2.1 */ { USB_DEVICE(VENDOR_ID_REALTEK, 0x0414) }, /* RTS5414 USB 3.2 */ { USB_DEVICE(VENDOR_ID_REALTEK, 0x5414) }, /* RTS5414 USB 2.1 */ + { USB_DEVICE(VENDOR_ID_TI, 0x8140) }, /* TI USB8041 3.0 */ + { USB_DEVICE(VENDOR_ID_TI, 0x8142) }, /* TI USB8041 2.0 */ {} }; MODULE_DEVICE_TABLE(usb, onboard_hub_id_table); diff --git a/drivers/usb/misc/onboard_usb_hub.h b/drivers/usb/misc/onboard_usb_hub.h index 7e743f4c8aaa..fcb6a9024bbd 100644 --- a/drivers/usb/misc/onboard_usb_hub.h +++ b/drivers/usb/misc/onboard_usb_hub.h @@ -11,7 +11,14 @@ struct onboard_hub_devtype_data { unsigned long reset_duration; /* reset pulse width in us */ }; +static const struct onboard_hub_devtype_data ti_tusb8041_data = { + .power_stable_time = 3000, + .reset_duration = 3000, +}; + static const struct of_device_id onboard_hub_match[] = { + { .compatible = "usb451,8140", .data = &ti_tusb8041_data, }, + { .compatible = "usb451,8142", .data = &ti_tusb8041_data, }, { .compatible = "usbbda,411" }, { .compatible = "usbbda,5411" }, { .compatible = "usbbda,414" },
This is a 4-port 3.0 USB hub. Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com> --- Changes in v2: * Add devtype data containing waiting times drivers/usb/misc/onboard_usb_hub.c | 3 +++ drivers/usb/misc/onboard_usb_hub.h | 7 +++++++ 2 files changed, 10 insertions(+)