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[69.109.179.158]) by smtp.gmail.com with ESMTPSA id v16-20020a05683011d000b0069457b86060sm3771038otq.47.2023.04.16.10.37.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 Apr 2023 10:37:11 -0700 (PDT) From: William Breathitt Gray To: Linus Walleij , Bartosz Golaszewski , Jonathan Cameron Cc: Lars-Peter Clausen , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, William Breathitt Gray Subject: [PATCH 0/3] Add Intel 8254 Counter support Date: Sun, 16 Apr 2023 13:36:52 -0400 Message-Id: X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The Intel 8254 PIT first appeared in the early 1980s and was used initially in IBM PC compatibles. The popularity of the original Intel 825x family of chips led to many subsequent variants and clones of the interface in various chips and integrated circuits. Although still popular, interfaces compatible with the Intel 8254 PIT are nowdays typically found embedded in larger VLSI processing chips and FPGA components rather than as discrete ICs. This patch series introduces a library to provide support for interfaces compatible with the venerable Intel 8254 Programmable Interval Timer (PIT). Modules wanting access to the i8254 library should select the newly introduced CONFIG_I8254 Kconfig option, and import the I8254 symbol namespace. Support for the i8254 is added in respective follow-up patches for the 104-dio-48e driver and stx104 driver whose devices feature i8254 compatible interfaces. Several additional dependencies are necessary for the 104-dio-48e [0][1][2] and stx104 [3][4]. Due to the dependency requirements, I can take the i8254 introduction patch through the Counter tree and provide an immutable branch that can be merged to the GPIO and IIO trees; the 104-dio-48e patch and stx104 patch could then be picked up separately by the respective subsystem maintainers. [0] https://lore.kernel.org/all/05a878d340251b781387db4b6490f288e41a651c.1680543810.git.william.gray@linaro.org/ [1] https://lore.kernel.org/all/20230208105542.9459-1-william.gray@linaro.org/ [2] https://lore.kernel.org/all/cover.1679323449.git.william.gray@linaro.org/ [3] https://lore.kernel.org/all/20230318185503.341914-1-william.gray@linaro.org/ [4] https://lore.kernel.org/all/cover.1680790580.git.william.gray@linaro.org/ William Breathitt Gray (3): counter: i8254: Introduce the Intel 8254 interface library module gpio: 104-dio-48e: Add Counter/Timer support iio: addac: stx104: Add 8254 Counter/Timer support Documentation/ABI/testing/sysfs-bus-counter | 54 +++ MAINTAINERS | 7 + drivers/counter/Kconfig | 15 + drivers/counter/Makefile | 1 + drivers/counter/counter-sysfs.c | 8 +- drivers/counter/i8254.c | 447 ++++++++++++++++++++ drivers/gpio/Kconfig | 1 + drivers/gpio/gpio-104-dio-48e.c | 127 +++++- drivers/iio/addac/Kconfig | 1 + drivers/iio/addac/stx104.c | 61 ++- include/linux/i8254.h | 21 + include/uapi/linux/counter.h | 6 + 12 files changed, 730 insertions(+), 19 deletions(-) create mode 100644 drivers/counter/i8254.c create mode 100644 include/linux/i8254.h base-commit: 09a9639e56c01c7a00d6c0ca63f4c7c41abe075d prerequisite-patch-id: 934c63dd47cb47e19739af076b95d3d55f5604f1 prerequisite-patch-id: 02aafdd535091da6a4ed6abbb20fb661f74af9fb prerequisite-patch-id: cd19046150b7cff1be4ac7152198777aa960a3df prerequisite-patch-id: bd3e3830d9ce4f3876a77483364d7190b7fdffa7 prerequisite-patch-id: 1e091c1f8f945a56cac59070221c4284306ba087 prerequisite-patch-id: c6f681fcbf7495c5ed6a596872dc4f762f22d977 prerequisite-patch-id: 239b016817624d56a4a2bddea1fda95282cb3d81 prerequisite-patch-id: 5fbfe7df44dcf5a629cd82ba8383480cb05b52d1 prerequisite-patch-id: 25a89f7312f225aaca11ef192e8d1f903a8b20e8 prerequisite-patch-id: 899b556161f417e20db8e957c5099b92c3dcb673 prerequisite-patch-id: eb09641cfb9e7caf7641ae6cb8e84e33cbb665a6