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Mon, 17 Aug 2026 22:34:29 -0700 (PDT) X-Received: by 2002:a05:6a21:3511:b0:3c3:b57b:6285 with SMTP id adf61e73a8af0-3cc71a2c74emr41459562637.13.1787031269417; Mon, 17 Aug 2026 22:34:29 -0700 (PDT) Received: from [192.168.29.31] ([49.36.209.30]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc149f235f0sm106692a12.27.2026.08.17.22.34.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 17 Aug 2026 22:34:28 -0700 (PDT) Message-ID: <476d36d9-68b5-4dc6-9bdb-102808c52f18@oss.qualcomm.com> Date: Tue, 18 Aug 2026 11:04:15 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v24 04/12] mfd: psci-mfd: Add PSCI MFD driver for cpuidle-psci-domain cell To: Lee Jones Cc: Lorenzo Pieralisi , Arnd Bergmann , Bjorn Andersson , Sebastian Reichel , Rob Herring , Souvik Chakravarty , Krzysztof Kozlowski , Andy Yan , Matthias Brugger , Mark Rutland , Conor Dooley , Konrad Dybcio , John Stultz , Moritz Fischer , "Rafael J. Wysocki" , Daniel Lezcano , Christian Loehle , Ulf Hansson , Pavan Kondeti , Bartosz Golaszewski , Sudeep Holla , Florian Fainelli , Krzysztof Kozlowski , Dmitry Baryshkov , Mukesh Ojha , Andre Draszik , Greg Kroah-Hartman , Kathiravan Thirumoorthy , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, mfd@lists.linux.dev, Srinivas Kandagatla , Bartosz Golaszewski References: <20260803-arm-psci-system_reset2-vendor-reboots-v24-0-889281373870@oss.qualcomm.com> <20260803-arm-psci-system_reset2-vendor-reboots-v24-4-889281373870@oss.qualcomm.com> <20260813123841.GC1820248@google.com> Content-Language: en-US From: Shivendra Pratap In-Reply-To: <20260813123841.GC1820248@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: 4n5N8YuNc3SDd6wY6bqqEelRMD-ztiKY X-Proofpoint-ORIG-GUID: 4n5N8YuNc3SDd6wY6bqqEelRMD-ztiKY X-Proofpoint-Spam-Info: AW1haW4tMjYwODE4MDAzOSBTYWx0ZWRfX7+sIfyekJTDn 1nDm+ise6sCofDPx+GPWbEqb30YknjqMRpIk5V3M/rl03yEgOXuYfC78SYLkYW0RdkTRUOASr2B loejJMXowbcautKNsmhRQ0xqJ6XSMhc= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE4MDAzOSBTYWx0ZWRfX2BsyZBUJ4r17 3GDrtyNbYTmP6vxFz+vJJHzuOzwLNs5OgtlA1FkpScP9pWh+39D7uI47d+mCEBaRhM0QCL8B33C ls2WsE8YopIz11voK37gizhVNhXHTHicbGG4spOYZrhUPlhbfej/EETzEZGRHLek+MIjn3bqox4 eMPILwuzytMOyAEVkB/mggdDCGc8SM1bjAfEUd9eDtwdtV1W340KtRua7wLJxaLv5FE1XKSBZLt YG6I2ZR4E9XRs2oS0O4LXjms2plWNaifqrR6r8AWqZQ553U4dJBX0fOK1YY/o8OmW4ncTk/UAIK F9F3cGY1Y1yn+oz9whhiU+peNoavcxQjL7UGt3FSrWUjwBIXD1OpzfELic1lzEhJ57zY8dZVqJ8 B48YHVv2NRQx7LrvAbVHxam+QX4SaNj8iG0IqRwKFBcHfwHNSoFH1+hvBepzp855egOZ7xGLIOm bGKkO5t7IFrkwtG57oA== X-Authority-Analysis: v=2.4 cv=UslT8ewB c=1 sm=1 tr=0 ts=6a83eee6 cx=c_pps a=Oh5Dbbf/trHjhBongsHeRQ==:117 a=LF1w/1kWa9VLj9Mif7fHrg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=JfrnYn6hAAAA:8 a=E1NoYtCZTwQndFzJm3AA:9 a=QEXdDO2ut3YA:10 a=_Vgx9l1VpLgwpw_dHYaR:22 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-17_04,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1015 impostorscore=0 suspectscore=0 phishscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 spamscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608180039 On 8/13/2026 6:08 PM, Lee Jones wrote: > On Mon, 03 Aug 2026, Shivendra Pratap wrote: > >> PSCI has multiple kernel consumers, such as cpuidle-psci-domain. >> Currently, both the PSCI core driver and cpuidle-psci-domain bind >> directly to the same PSCI node "arm,psci-1.0". Additional consumers, if >> introduced, would also need to bind in the same way, leading to several >> drivers attached to a single device node. >> >> Introduce a PSCI MFD driver that binds to "arm,psci-1.0" and registers >> PSCI child cells. As the first user, register cpuidle-psci-domain as a >> child cell. >> >> Update cpuidle-psci-domain to probe as an MFD child and use the parent >> PSCI node for power-domain traversal. >> >> Suggested-by: Bartosz Golaszewski >> Reviewed-by: Bartosz Golaszewski >> Signed-off-by: Shivendra Pratap >> --- >> MAINTAINERS | 1 + >> drivers/cpuidle/Kconfig.arm | 1 + >> drivers/cpuidle/cpuidle-psci-domain.c | 9 +------- >> drivers/mfd/Kconfig | 12 ++++++++++ >> drivers/mfd/Makefile | 2 ++ >> drivers/mfd/psci-mfd.c | 43 +++++++++++++++++++++++++++++++++++ > > We don't usually allow the use of the term MFD in devices. > > What does this do? Is it a mux? psci-mux? > > If not, think about what it is and call it that instead. will rename it. > >> 6 files changed, 60 insertions(+), 8 deletions(-) >> >> diff --git a/MAINTAINERS b/MAINTAINERS >> index fe67f7bfa44c..0b6e4f89f319 100644 >> --- a/MAINTAINERS >> +++ b/MAINTAINERS >> @@ -21671,6 +21671,7 @@ L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers) >> S: Maintained >> F: Documentation/devicetree/bindings/arm/psci.yaml >> F: drivers/firmware/psci/ >> +F: drivers/mfd/psci-mfd.c >> F: include/linux/psci.h >> F: include/uapi/linux/psci.h >> >> diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm >> index b88b01aa5829..c5ecca0d7397 100644 >> --- a/drivers/cpuidle/Kconfig.arm >> +++ b/drivers/cpuidle/Kconfig.arm >> @@ -36,6 +36,7 @@ config ARM_PSCI_CPUIDLE_DOMAIN >> bool "PSCI CPU idle Domain" >> depends on ARM_PSCI_CPUIDLE >> depends on PM_GENERIC_DOMAINS_OF >> + depends on MFD_PSCI >> select DT_IDLE_GENPD >> default y >> help >> diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c >> index b9e4ad7d43a3..a2d01810f295 100644 >> --- a/drivers/cpuidle/cpuidle-psci-domain.c >> +++ b/drivers/cpuidle/cpuidle-psci-domain.c >> @@ -17,7 +17,6 @@ >> #include >> #include >> #include >> -#include >> >> #include "cpuidle-psci.h" >> #include "dt_idle_genpd.h" >> @@ -122,14 +121,9 @@ static void psci_pd_remove(void) >> } >> } >> >> -static const struct of_device_id psci_of_match[] = { >> - { .compatible = "arm,psci-1.0" }, >> - {} >> -}; >> - >> static int psci_cpuidle_domain_probe(struct platform_device *pdev) >> { >> - struct device_node *np = pdev->dev.of_node; >> + struct device_node *np = pdev->dev.parent->of_node; > > dev_of_node(pdev->dev.parent); Ack. > >> bool use_osi = psci_has_osi_support(); >> int ret = 0, pd_count = 0; >> >> @@ -181,7 +175,6 @@ static struct platform_driver psci_cpuidle_domain_driver = { >> .probe = psci_cpuidle_domain_probe, >> .driver = { >> .name = "psci-cpuidle-domain", >> - .of_match_table = psci_of_match, >> }, >> }; >> >> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig >> index e4fd4572472f..d18655d76172 100644 >> --- a/drivers/mfd/Kconfig >> +++ b/drivers/mfd/Kconfig >> @@ -2374,6 +2374,18 @@ config MFD_KHADAS_MCU >> additional drivers must be enabled in order to use the functionality >> of the device. >> >> +config MFD_PSCI >> + bool "PSCI MFD for psci child cells" > > "PSCI mux for registering PSCI component devices" ? > >> + depends on ARM_PSCI_FW >> + depends on OF >> + select MFD_CORE >> + default y >> + help >> + PSCI MFD registers PSCI child cells and exposes them as >> + platform devices. > > This is what all DT related MFD devices do. > >> + Child drivers are probed only if enabled in the >> + kernel configuration. > > Nothing new here either. This is the norm. > > "PSCI Mux is a Linux specific device splitter designed to register > multiple PSCI related components via a single Device Tree compatible. > Without it, devices would each bind to a single node ... problems with x, y and z>" Ack. Will make it more relevant. > >> + Select this option whenever a supported PSCI >> + child driver is selected. >> + >> config MFD_ACER_A500_EC >> tristate "Support for Acer Iconia Tab A500 Embedded Controller" >> depends on I2C >> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile >> index 72d3944b0ad8..f3edfad702ff 100644 >> --- a/drivers/mfd/Makefile >> +++ b/drivers/mfd/Makefile >> @@ -24,6 +24,8 @@ obj-$(CONFIG_MFD_EXYNOS_LPASS) += exynos-lpass.o >> obj-$(CONFIG_MFD_GATEWORKS_GSC) += gateworks-gsc.o >> obj-$(CONFIG_MFD_MACSMC) += macsmc.o >> >> +obj-$(CONFIG_MFD_PSCI) += psci-mfd.o >> + >> obj-$(CONFIG_MFD_TI_LP873X) += lp873x.o >> obj-$(CONFIG_MFD_TI_LP87565) += lp87565.o >> obj-$(CONFIG_MFD_TI_AM335X_TSCADC) += ti_am335x_tscadc.o >> diff --git a/drivers/mfd/psci-mfd.c b/drivers/mfd/psci-mfd.c >> new file mode 100644 >> index 000000000000..7affd6bb09dd >> --- /dev/null >> +++ b/drivers/mfd/psci-mfd.c >> @@ -0,0 +1,43 @@ >> +// SPDX-License-Identifier: GPL-2.0-only >> +/* >> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. >> + */ >> + >> +#include >> +#include >> +#include >> +#include >> + >> +static const struct mfd_cell psci_cells[] = { >> + { >> + .name = "psci-cpuidle-domain", >> + }, >> +}; > > MFD_CELL_NAME() ? > > MFD drivers have to support more than one device from the get-go. > Please add your other device here in this patch. Ack. > >> +static int psci_mfd_probe(struct platform_device *pdev) > > No to _mfd_. Ack. >> +{ >> + return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, psci_cells, >> + ARRAY_SIZE(psci_cells), NULL, 0, NULL); >> +} >> + >> +static const struct of_device_id psci_mfd_of_match[] = { >> + { .compatible = "arm,psci-1.0" }, >> + { } >> +}; >> + >> +static struct platform_driver psci_mfd_driver = { >> + .probe = psci_mfd_probe, >> + .driver = { >> + .name = "psci-mfd", >> + .of_match_table = psci_mfd_of_match, >> + }, >> +}; >> + >> +static int __init psci_mfd_init(void) >> +{ >> + return platform_driver_register(&psci_mfd_driver); >> +} >> + > > Remove this line. Ack. > >> +core_initcall(psci_mfd_init); > > This is usually a hack. Why can't you use -EPROBE_DEFER? Ack. thanks, Shivendra