From: gregkh@linuxfoundation•org (Greg Kroah-Hartman)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v6 03/25] usb: ulpi: Support device discovery via DT
Date: Thu, 19 Jan 2017 08:39:01 +0100 [thread overview]
Message-ID: <20170119073901.GF14493@kroah.com> (raw)
In-Reply-To: <20170119063349.GB10621@b29397-desktop>
On Thu, Jan 19, 2017 at 02:33:49PM +0800, Peter Chen wrote:
> On Wed, Dec 28, 2016 at 02:56:49PM -0800, Stephen Boyd wrote:
> > The qcom HSIC ULPI phy doesn't have any bits set in the vendor or
> > product ID registers. This makes it impossible to make a ULPI
> > driver match against the ID registers. Add support to discover
> > the ULPI phys via DT help alleviate this problem. In the DT case,
> > we'll look for a ULPI bus node underneath the device registering
> > the ULPI viewport (or the parent of that device to support
> > chipidea's device layout) and then match up the phy node
> > underneath that with the ULPI device that's created.
> >
> > The side benefit of this is that we can use standard properties
> > in the phy node like clks, regulators, gpios, etc. because we
> > don't have firmware like ACPI to turn these things on for us. And
> > we can use the DT phy binding to point our phy consumer to the
> > phy provider.
> >
> > The ULPI bus code supports native enumeration by reading the
> > vendor ID and product ID registers at device creation time, but
> > we can't be certain that those register reads will succeed if the
> > phy is not powered up. To avoid any problems with reading the ID
> > registers before the phy is powered we fallback to DT matching
> > when the ID reads fail.
> >
> > If the ULPI spec had some generic power sequencing for these
> > registers we could put that into the ULPI bus layer and power up
> > the device before reading the ID registers. Unfortunately this
> > doesn't exist and the power sequence is usually device specific.
> > By having the device matched up with DT we can avoid this
> > problem.
> >
> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation•org>
> > Acked-by: Heikki Krogerus <heikki.krogerus@linux•intel.com>
> > Cc: <devicetree@vger•kernel.org>
> > Acked-by: Rob Herring <robh@kernel•org>
> > Signed-off-by: Stephen Boyd <stephen.boyd@linaro•org>
>
> Greg, is it ok I pick up this patch, and send it with chipidea
> changes together for 4.11-rc1 later?
No objection from me.
thanks,
greg k-h
next prev parent reply other threads:[~2017-01-19 7:39 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-28 22:56 [PATCH v6 00/25] Support qcom's HSIC USB and rewrite USB2 HS support Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 01/25] of: device: Support loading a module with OF based modalias Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 02/25] of: device: Export of_device_{get_modalias, uvent_modalias} to modules Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 03/25] usb: ulpi: Support device discovery via DT Stephen Boyd
2017-01-19 6:33 ` Peter Chen
2017-01-19 7:39 ` Greg Kroah-Hartman [this message]
2016-12-28 22:56 ` [PATCH v6 04/25] usb: chipidea: Only read/write OTGSC from one place Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 05/25] usb: chipidea: Handle extcon events properly Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 06/25] usb: chipidea: Add platform flag for wrapper phy management Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 07/25] usb: chipidea: Notify events when switching host mode Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 08/25] usb: chipidea: Remove locking in ci_udc_start() Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 09/25] usb: chipidea: Add support for ULPI PHY bus Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 10/25] usb: chipidea: Consolidate extcon notifiers Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 11/25] usb: chipidea: vbus event may exist before starting gadget Stephen Boyd
2017-01-03 8:00 ` Peter Chen
2017-01-12 0:32 ` Stephen Boyd
2017-01-12 9:52 ` Peter Chen
2016-12-28 22:56 ` [PATCH v6 12/25] usb: chipidea: msm: Mark device as runtime pm active Stephen Boyd
2016-12-28 22:56 ` [PATCH v6 13/25] usb: chipidea: msm: Rely on core to override AHBBURST Stephen Boyd
2016-12-28 22:57 ` [PATCH v6 14/25] usb: chipidea: msm: Use hw_write_id_reg() instead of writel Stephen Boyd
2016-12-28 22:57 ` [PATCH v6 15/25] usb: chipidea: msm: Add proper clk and reset support Stephen Boyd
2016-12-28 22:57 ` [PATCH v6 16/25] usb: chipidea: msm: Mux over secondary phy at the right time Stephen Boyd
2016-12-28 22:57 ` [PATCH v6 17/25] usb: chipidea: msm: Restore wrapper settings after reset Stephen Boyd
2016-12-28 22:57 ` [PATCH v6 18/25] usb: chipidea: msm: Make platform data driver local instead of global Stephen Boyd
2016-12-28 22:57 ` [PATCH v6 19/25] usb: chipidea: msm: Add reset controller for PHY POR bit Stephen Boyd
2016-12-28 22:57 ` [PATCH v6 20/25] usb: chipidea: msm: Handle phy power states Stephen Boyd
2016-12-28 22:57 ` [PATCH v6 21/25] usb: chipidea: msm: Be silent on probe defer errors Stephen Boyd
2016-12-28 22:57 ` [PATCH v6 22/25] usb: chipidea: Drop lock across event_notify during gadget stop Stephen Boyd
2017-01-03 6:46 ` Peter Chen
2016-12-28 22:57 ` [PATCH v6 23/25] usb: chipidea: Pullup D+ in device mode via phy APIs Stephen Boyd
2017-01-03 6:53 ` Peter Chen
2017-01-12 0:19 ` Stephen Boyd
2017-01-12 9:50 ` Peter Chen
2017-01-12 22:49 ` Stephen Boyd
2017-01-13 3:35 ` Peter Chen
2017-01-13 20:03 ` Stephen Boyd
2017-01-16 3:45 ` Peter Chen
2017-01-17 17:58 ` Stephen Boyd
2017-01-18 7:34 ` Peter Chen
2017-01-18 20:54 ` Stephen Boyd
2017-01-18 20:57 ` Rob Herring
2017-01-19 6:29 ` Peter Chen
2016-12-28 22:57 ` [PATCH v6 24/25] phy: Add support for Qualcomm's USB HSIC phy Stephen Boyd
2016-12-28 22:57 ` [PATCH v6 25/25] phy: Add support for Qualcomm's USB HS phy Stephen Boyd
2017-01-20 7:40 ` [PATCH v6 00/25] Support qcom's HSIC USB and rewrite USB2 HS support Peter Chen
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