Re: [PATCH v3 1/2] drivers: bus: simple-pm-bus: Add support for probing simple bus only devices
From: Saravana Kannan <hidden>
Date: 2021-09-24 20:20:42
Also in:
linux-omap, linux-renesas-soc, linux-riscv, lkml
On Fri, Sep 24, 2021 at 4:50 AM Ulf Hansson [off-list ref] wrote:
On Thu, 9 Sept 2021 at 13:01, Ulf Hansson [off-list ref] wrote:quoted
On Sat, 4 Sept 2021 at 02:05, Saravana Kannan [off-list ref] wrote:quoted
fw_devlink could end up creating device links for bus only devices. However, bus only devices don't get probed and can block probe() or sync_state() [1] call backs of other devices. To avoid this, probe these devices using the simple-pm-bus driver. However, there are instances of devices that are not simple buses (they get probed by their specific drivers) that also list the "simple-bus" (or other bus only compatible strings) in their compatible property to automatically populate their child devices. We still want these devices to get probed by their specific drivers. So, we make sure this driver only probes devices that are only buses. [1] - https://lore.kernel.org/lkml/CAPDyKFo9Bxremkb1dDrr4OcXSpE0keVze94Cm=zrkOVxHHxBmQ@mail.gmail.com/ (local) Signed-off-by: Saravana Kannan <redacted> Tested-by: Saravana Kannan <redacted>Tested-by: Ulf Hansson <redacted>Saravana, Rob, I have been following your latest discussion in this thread - and it looks like you guys are moving towards a consensus. Although, if there is anything I can do to help to complete this, just tell me and I will jump in immediately.
Looks like we settled on the allow list approach during the BoF in LPC. I'll send out a v4 with some tweaks. -Saravana _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel