linux-kernel - Re: [PATCH v3 0/3] OF support for Surface System Aggregator Module

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1edadffb-67d9-476e-b0f7-7f3fc34e9592@redhat.com>
Date: Mon, 19 Aug 2024 13:57:19 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, "Rafael J. Wysocki" <rafael@...nel.org>,
 Len Brown <lenb@...nel.org>, Maximilian Luz <luzmaximilian@...il.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>,
 linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, linux-acpi@...r.kernel.org,
 platform-driver-x86@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <quic_kdybcio@...cinc.com>,
 Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH v3 0/3] OF support for Surface System Aggregator Module

Hi,

On 8/14/24 12:27 PM, Konrad Dybcio wrote:
> Wire up OF support for SSAM drivers, to use with Surface Laptop 7 and
> other Qualcomm-based devices.
> 
> Patch 3 references compatible strings introduced in [1]
> 
> [1] https://lore.kernel.org/linux-arm-msm/20240809-topic-sl7-v1-1-2090433d8dfc@quicinc.com/T/#u
> 
> Signed-off-by: Konrad Dybcio <quic_kdybcio@...cinc.com>

Thank you for your patch-series, I've applied the series to my
review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

I did notice the following compiler warning when test building:

drivers/platform/surface/surface_aggregator_registry.c:278:36: warning: ‘ssam_node_group_sl7’ defined but not used [-Wunused-variable]
  278 | static const struct software_node *ssam_node_group_sl7[] = {
      |                                    ^~~~~~~~~~~~~~~~~~~

One way to fix this would be add #ifdef CONFIG_OF around the definition
of ssam_node_group_sl7, but then future devicetree based surface devices
would need more #ifdef-s so instead I've solved it by squashing in this fix:

diff --git a/drivers/platform/surface/surface_aggregator_registry.c b/drivers/platform/surface/surface_aggregator_registry.c
index 495cb4300617..ac96e883cb57 100644
--- a/drivers/platform/surface/surface_aggregator_registry.c
+++ b/drivers/platform/surface/surface_aggregator_registry.c
@@ -415,14 +415,12 @@ static const struct acpi_device_id ssam_platform_hub_acpi_match[] = {
 };
 MODULE_DEVICE_TABLE(acpi, ssam_platform_hub_acpi_match);
 
-#ifdef CONFIG_OF
-static const struct of_device_id ssam_platform_hub_of_match[] = {
+static const struct of_device_id ssam_platform_hub_of_match[] __maybe_unused = {
 	/* Surface Laptop 7 */
 	{ .compatible = "microsoft,romulus13", (void *)ssam_node_group_sl7 },
 	{ .compatible = "microsoft,romulus15", (void *)ssam_node_group_sl7 },
 	{ },
 };
-#endif
 
 static int ssam_platform_hub_probe(struct platform_device *pdev)
 {

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans


> ---
> Changes in v3:
> - Drop unnecessary nullchecks
> - Add MODULE_ALIAS in the platform hub driver
> - Fix MODULE_DEVICE_TABLE after rename
> - Prolong the '----' comment to 80 lines
> - Change the current-speed bindings description to ": true", in
>   preparation for krzk's serial device bindings reorganization
> - Link to v2: https://lore.kernel.org/r/20240810-topic-sam-v2-0-8a8eb368a4f0@quicinc.com
> 
> Changes in v2:
> - Fix kerneldoc
> - Drop the drivers/acpi change (oops)
> - Style fixes
> - Don't assign int to acpi_status
> - Don't scan the bus twice in SAM core probe
> - Link to v1: https://lore.kernel.org/r/20240809-topic-sam-v1-0-05bca1932614@quicinc.com
> 
> ---
> Konrad Dybcio (3):
>       dt-bindings: serial: Allow embedded-controller as child node
>       dt-bindings: platform: Add Surface System Aggregator Module
>       platform/surface: Add OF support
> 
>  .../bindings/platform/microsoft,surface-sam.yaml   | 47 +++++++++++++
>  .../devicetree/bindings/serial/serial.yaml         |  2 +-
>  drivers/platform/surface/aggregator/bus.c          |  2 +
>  drivers/platform/surface/aggregator/controller.c   | 67 ++++++++++++++----
>  drivers/platform/surface/aggregator/core.c         | 82 +++++++++++++++++-----
>  drivers/platform/surface/surface3_power.c          |  1 +
>  drivers/platform/surface/surface_acpi_notify.c     |  1 +
>  .../platform/surface/surface_aggregator_registry.c | 47 +++++++++++--
>  8 files changed, 210 insertions(+), 39 deletions(-)
> ---
> base-commit: 1e391b34f6aa043c7afa40a2103163a0ef06d179
> change-id: 20240809-topic-sam-5de2f0ec9370
> 
> Best regards,