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Fri, 15 Aug 2025 02:09:15 -0700 (PDT) Received: from [127.0.1.1] ([2a01:cb1d:dc:7e00:a125:bd3e:6904:c9f9]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3bb676c9a67sm1205210f8f.35.2025.08.15.02.09.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Aug 2025 02:09:15 -0700 (PDT) From: Bartosz Golaszewski Subject: [PATCH v5 00/15] pinctrl: introduce the concept of a GPIO pin function category Date: Fri, 15 Aug 2025 11:09:02 +0200 Message-Id: <20250815-pinctrl-gpio-pinfuncs-v5-0-955de9fd91db@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAC75nmgC/3XPSwrCMBCA4atI1kbyrI0r7yEu0mTaDpSkJFoU6 d1NBVGRLv+BfDN5kAwJIZPD5kESTJgxhhJ6uyGut6EDir40EUxotmecjhjcJQ20GzEu0V6Dy9R DLRpvrHVKkvJ2TNDi7eWezqV7zJeY7q81E1+mb1GsiBOnjIIvKmuNqmp/HDDYFHcxdWQhJ/HNm DVGFKapuNRcGce8+WPkFyPUGiMLY1vlGyOZ8KD+GPVhar76KbVc00jDKqc1VL/MPM9PsgKXVZA BAAA= X-Change-ID: 20250701-pinctrl-gpio-pinfuncs-de82bd9aac43 To: Linus Walleij , Bjorn Andersson , Konrad Dybcio , Alexey Klimov , Lorenzo Bianconi , Sean Wang , Matthias Brugger , AngeloGioacchino Del Regno , Paul Cercueil , Kees Cook , Andy Shevchenko , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. 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It will result in the following error: [ 5.095688] sc8280xp-tlmm f100000.pinctrl: pin GPIO_25 already requested by regulator-edp-3p3; cannot claim for f100000.pinctrl:570 [ 5.107822] sc8280xp-tlmm f100000.pinctrl: error -EINVAL: pin-25 (f100000.pinctrl:570) This typically makes sense except when the pins are muxed to a function that actually says "GPIO". Of course, the function name is just a string so it has no meaning to the pinctrl subsystem. We have many Qualcomm SoCs (and I can imagine it's a common pattern in other platforms as well) where we mux a pin to "gpio" function using the `pinctrl-X` property in order to configure bias or drive-strength and then access it using the gpiod API. This makes it impossible to mark the pin controller module as "strict". This series proposes to introduce a concept of a sub-category of pinfunctions: GPIO functions where the above is not true and the pin muxed as a GPIO can still be accessed via the GPIO consumer API even for strict pinmuxers. To that end: we first clean up the drivers that use struct function_desc and make them use the smaller struct pinfunction instead - which is the correct structure for drivers to describe their pin functions with. We also rework pinmux core to not duplicate memory used to store the pinfunctions unless they're allocated dynamically. First: provide the kmemdup_const() helper which only duplicates memory if it's not in the .rodata section. Then rework all pinctrl drivers that instantiate objects of type struct function_desc as they should only be created by pinmux core. Next constify the return value of the accessor used to expose these structures to users and finally convert the pinfunction object within struct function_desc to a pointer and use kmemdup_const() to assign it. With this done proceed to add infrastructure for the GPIO pin function category and use it in Qualcomm drivers. At the very end: make the Qualcomm pinmuxer strict. Signed-off-by: Bartosz Golaszewski --- Changes in v5: - Fix a potential NULL-pointer dereference in pinmux_can_be_used_for_gpio() - Use PINCTRL_PINFUNCTION() in pinctrl-airoha - Link to v4: https://lore.kernel.org/r/20250812-pinctrl-gpio-pinfuncs-v4-0-bb3906c55e64@linaro.org Changes in v4: - Update the GPIO pin function definitions to include the new qcom driver (milos) - Provide devm_kmemdup_const() instead of a non-managed kmemdup_const() as a way to avoid casting out the 'const' modifier when passing the const pointer to devm_add_action_or_reset() - Use devm_krealloc_array() where applicable instead of devm_krealloc() - Fix typos - Fix kerneldocs - Improve commit messages - Small tweaks as pointed out by Andy - Rebased on top of v6.17-rc1 - Link to v3: https://lore.kernel.org/r/20250724-pinctrl-gpio-pinfuncs-v3-0-af4db9302de4@linaro.org Changes in v3: - Add more patches in front: convert pinctrl drivers to stop defining their own struct function_desc objects and make pinmux core not duplicate .rodata memory in which struct pinfunction objects are stored. - Add a patch constifying pinmux_generic_get_function(). - Drop patches that were applied upstream. - Link to v2: https://lore.kernel.org/r/20250709-pinctrl-gpio-pinfuncs-v2-0-b6135149c0d9@linaro.org Changes in v2: - Extend the series with providing pinmux_generic_add_pinfunction(), using it in several drivers and converting pinctrl-msm to using generic pinmux helpers - Add a generic function_is_gpio() callback for pinmux_ops - Convert all qualcomm drivers to using the new GPIO pin category so that we can actually enable the strict flag - Link to v1: https://lore.kernel.org/r/20250702-pinctrl-gpio-pinfuncs-v1-0-ed2bd0f9468d@linaro.org --- Bartosz Golaszewski (15): devres: provide devm_kmemdup_const() pinctrl: ingenic: use struct pinfunction instead of struct function_desc pinctrl: airoha: replace struct function_desc with struct pinfunction pinctrl: mediatek: mt7988: use PINCTRL_PIN_FUNCTION() pinctrl: mediatek: moore: replace struct function_desc with struct pinfunction pinctrl: imx: don't access the pin function radix tree directly pinctrl: keembay: release allocated memory in detach path pinctrl: keembay: use a dedicated structure for the pinfunction description pinctrl: constify pinmux_generic_get_function() pinctrl: make struct pinfunction a pointer in struct function_desc pinctrl: qcom: use generic pin function helpers pinctrl: allow to mark pin functions as requestable GPIOs pinctrl: qcom: add infrastructure for marking pin functions as GPIOs pinctrl: qcom: mark the `gpio` and `egpio` pins function as non-strict functions pinctrl: qcom: make the pinmuxing strict drivers/base/devres.c | 21 ++++++++ drivers/pinctrl/freescale/pinctrl-imx.c | 42 ++++++---------- drivers/pinctrl/mediatek/pinctrl-airoha.c | 19 +++----- drivers/pinctrl/mediatek/pinctrl-moore.c | 10 ++-- drivers/pinctrl/mediatek/pinctrl-moore.h | 7 +-- drivers/pinctrl/mediatek/pinctrl-mt7622.c | 2 +- drivers/pinctrl/mediatek/pinctrl-mt7623.c | 2 +- drivers/pinctrl/mediatek/pinctrl-mt7629.c | 2 +- drivers/pinctrl/mediatek/pinctrl-mt7981.c | 2 +- drivers/pinctrl/mediatek/pinctrl-mt7986.c | 2 +- drivers/pinctrl/mediatek/pinctrl-mt7988.c | 44 +++++++---------- drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h | 2 +- drivers/pinctrl/pinctrl-equilibrium.c | 2 +- drivers/pinctrl/pinctrl-ingenic.c | 49 +++++++++---------- drivers/pinctrl/pinctrl-keembay.c | 26 ++++++---- drivers/pinctrl/pinctrl-single.c | 4 +- drivers/pinctrl/pinmux.c | 61 ++++++++++++++++++++---- drivers/pinctrl/pinmux.h | 9 ++-- drivers/pinctrl/qcom/pinctrl-ipq5018.c | 2 +- drivers/pinctrl/qcom/pinctrl-ipq5332.c | 2 +- drivers/pinctrl/qcom/pinctrl-ipq5424.c | 2 +- drivers/pinctrl/qcom/pinctrl-ipq6018.c | 2 +- drivers/pinctrl/qcom/pinctrl-ipq8074.c | 2 +- drivers/pinctrl/qcom/pinctrl-ipq9574.c | 2 +- drivers/pinctrl/qcom/pinctrl-mdm9607.c | 2 +- drivers/pinctrl/qcom/pinctrl-mdm9615.c | 2 +- drivers/pinctrl/qcom/pinctrl-milos.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm.c | 45 ++++++----------- drivers/pinctrl/qcom/pinctrl-msm.h | 5 ++ drivers/pinctrl/qcom/pinctrl-msm8226.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8660.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8909.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8916.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8917.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8953.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8960.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8976.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8994.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8996.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8998.c | 2 +- drivers/pinctrl/qcom/pinctrl-msm8x74.c | 2 +- drivers/pinctrl/qcom/pinctrl-qcm2290.c | 4 +- drivers/pinctrl/qcom/pinctrl-qcs404.c | 2 +- drivers/pinctrl/qcom/pinctrl-qcs615.c | 2 +- drivers/pinctrl/qcom/pinctrl-qcs8300.c | 4 +- drivers/pinctrl/qcom/pinctrl-qdu1000.c | 2 +- drivers/pinctrl/qcom/pinctrl-sa8775p.c | 4 +- drivers/pinctrl/qcom/pinctrl-sar2130p.c | 2 +- drivers/pinctrl/qcom/pinctrl-sc7180.c | 2 +- drivers/pinctrl/qcom/pinctrl-sc7280.c | 4 +- drivers/pinctrl/qcom/pinctrl-sc8180x.c | 2 +- drivers/pinctrl/qcom/pinctrl-sc8280xp.c | 4 +- drivers/pinctrl/qcom/pinctrl-sdm660.c | 2 +- drivers/pinctrl/qcom/pinctrl-sdm670.c | 2 +- drivers/pinctrl/qcom/pinctrl-sdm845.c | 2 +- drivers/pinctrl/qcom/pinctrl-sdx55.c | 2 +- drivers/pinctrl/qcom/pinctrl-sdx65.c | 2 +- drivers/pinctrl/qcom/pinctrl-sdx75.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm4450.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm6115.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm6125.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm6350.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm6375.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm7150.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm8150.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm8250.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm8350.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm8450.c | 4 +- drivers/pinctrl/qcom/pinctrl-sm8550.c | 2 +- drivers/pinctrl/qcom/pinctrl-sm8650.c | 4 +- drivers/pinctrl/qcom/pinctrl-sm8750.c | 4 +- drivers/pinctrl/qcom/pinctrl-x1e80100.c | 2 +- drivers/pinctrl/renesas/pinctrl-rza1.c | 2 +- drivers/pinctrl/renesas/pinctrl-rza2.c | 2 +- drivers/pinctrl/renesas/pinctrl-rzg2l.c | 2 +- drivers/pinctrl/renesas/pinctrl-rzv2m.c | 2 +- include/linux/device/devres.h | 2 + include/linux/pinctrl/pinctrl.h | 14 ++++++ include/linux/pinctrl/pinmux.h | 2 + 79 files changed, 275 insertions(+), 227 deletions(-) --- base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585 change-id: 20250701-pinctrl-gpio-pinfuncs-de82bd9aac43 Best regards, -- Bartosz Golaszewski