{"id":2232125,"url":"http://patchwork.ozlabs.org/api/patches/2232125/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-gpio/patch/CAAMcf8C_A9dJ_v4QRKtb9eGNOpJ7BZNOGsFP4i2WFOZxOVBPnQ@mail.gmail.com/","project":{"id":42,"url":"http://patchwork.ozlabs.org/api/projects/42/?format=json","name":"Linux GPIO development","link_name":"linux-gpio","list_id":"linux-gpio.vger.kernel.org","list_email":"linux-gpio@vger.kernel.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"","list_archive_url":null,"date":"2026-05-02T21:52:00","name":"gpio-mt7621 unroutable IRQs to bank0","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"7d6fa893bbafed33f67739286edfce75eda32a2a","submitter":{"id":66975,"url":"http://patchwork.ozlabs.org/api/people/66975/?format=json","name":"Vicente Bergas","email":"vicencb@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-gpio/patch/CAAMcf8C_A9dJ_v4QRKtb9eGNOpJ7BZNOGsFP4i2WFOZxOVBPnQ@mail.gmail.com/mbox/","series":[{"id":502552,"url":"http://patchwork.ozlabs.org/api/series/502552/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-gpio/list/?series=502552","date":"2026-05-02T21:52:00","name":"gpio-mt7621 unroutable IRQs to bank0","version":1,"mbox":"http://patchwork.ozlabs.org/series/502552/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2232125/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2232125/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=D/fYaeLq;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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Sat, 02 May 2026\n 14:52:11 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-gpio@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","From":"Vicente Bergas ","Date":"Sat, 2 May 2026 23:52:00 +0200","X-Gm-Features":"AVHnY4LyRBywdXlbR__5FvY6Hmd9edTzaPB4z2QZngbpCQrAUA62aIk0zb2Ffgk","Message-ID":"\n ","Subject":"gpio-mt7621 unroutable IRQs to bank0","To":"Linus Walleij ,\n\tSergio Paracuellos ,\n Bartosz Golaszewski ,\n\tThomas Gleixner , Grant Likely ,\n\tAnna-Maria Behnsen ","Cc":"Linux Kernel Mailing List ,\n linux-gpio@vger.kernel.org","Content-Type":"text/plain; charset=\"UTF-8\""},"content":"Hi,\nGrant Likely noticed a potential issue and\ndocumented it as a comment in kernel/irq/irqdomain.c:\n * We might want to match the legacy controller last since\n * it might potentially be set to match all interrupts in\n * the absence of a device node. This isn't a problem so far\n * yet though...\n\nThere is a bug that is affecting me and\nit is triggered by the forseen potential issue.\n\ndrivers/gpio/gpio-mt7621.c is registering 96 GPIOs,\nall of them capable of generating IRQs.\nBut the `struct irq_chip` can only handle 32 IRQs,\nso, 3 banks are instantiated.\n\nThe DTS file specifies the interrupt for one device as\n interrupt-parent = <&gpio>;\n interrupts = <0 IRQ_TYPE_EDGE_FALLING>;\nwhich should be routed to Bank0 GPIO0 but\nit is instead routed to Bank2. This is the bug.\n\nThe call trace that leads to the problem is:\n drivers/i2c/i2c-core-base.c:i2c_device_probe\n drivers/base/property.c:fwnode_irq_get\n drivers/of/irq.c:of_irq_get\n include/linux/irqdomain.h:irq_find_host\n include/linux/irqdomain.h:irq_find_matching_host\n include/linux/irqdomain.h:irq_find_matching_fwnode\n kernel/irq/irqdomain.c:irq_find_matching_fwspec\n\nAs a way to prove that this is indeed the problem,\nthe following workaround makes it work.\nIt just inverts the sorting order of all matches,\nso it picks Bank0 instead of Bank2.\n\n\nFor a bit more context, the platform used is an mt7628an.\nThe problematic device is:\n&i2c {\n pinctrl-names = \"default\";\n pinctrl-0 = <&i2c_pins>;\n status = \"okay\";\n ft6336u: touchscreen@38 {\n compatible = \"focaltech,ft6236\";\n reg = <0x38>;\n interrupt-parent = <&gpio>;\n interrupts = <0 IRQ_TYPE_EDGE_FALLING>;\n reset-gpios = <&gpio 2 GPIO_ACTIVE_LOW>;\n };\n};\n\nPlease, can you fix this bug?\n\nI'll will be able to test, but because my platform is only supported\nafter applying openwrt patches, i can only test on v6.18.y.\n\nRegards,\n Vicente.","diff":"--- a/kernel/irq/irqdomain.c\n+++ b/kernel/irq/irqdomain.c\n@@ -538,7 +538,6 @@ irq_find_matching_fwspec\n\n if (rc) {\n found = h;\n- break;\n }\n }\n mutex_unlock(&irq_domain_mutex);\n","prefixes":[]}