From patchwork Sat Nov 27 22:32:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sam Protsenko X-Patchwork-Id: 517537 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9BD07C4332F for ; Sat, 27 Nov 2021 22:35:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356426AbhK0WiL (ORCPT ); Sat, 27 Nov 2021 17:38:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57122 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356329AbhK0WgL (ORCPT ); Sat, 27 Nov 2021 17:36:11 -0500 Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 73F54C06174A for ; Sat, 27 Nov 2021 14:32:56 -0800 (PST) Received: by mail-wr1-x42a.google.com with SMTP id s13so27322997wrb.3 for ; Sat, 27 Nov 2021 14:32:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=z2taSSZqsXJEO0VA8diRrTsYi9SJ790CZvpQPDqqNZE=; b=LOur6N1y5xzdgX12hTaFwltrnm5zvCLhWldD+Rl9jlEvfMRldDw40M/x6oPSkO19i4 23Fzx9L9CebdnPb0FvEVBqSK5jKmxlKjINOJDQwEeVtkcwoAN0Q791DBiWB0m7yjJsGw 90nFt5fwo9dY7PkYiy/O6Crz9dRXXVu7yWD2zwr4u+/M3p/svEWz653H9RXoF2sj8Gb5 zh8sXclIRRcGbdG8czsj5cPoXuGjLLsJukLPI5ul96EsU6IGcWk3aQy8T1KPIvG4lw/7 ucdhjOVs2FXQayU0+yPz3UEYB/Z/YLJPvVh9PME8xAOdymyd/VBl7m1UHXucZb9bZSZM 8Xbg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=z2taSSZqsXJEO0VA8diRrTsYi9SJ790CZvpQPDqqNZE=; b=LJtcD5CrDGNLoDzBfq67i1xUVsVzXNJC0RoR2uB0Q1sHZ7C5xehOXu+QlN4FxGnhD6 sKCHhy+1PgB4aAuQ9i40DtTUhtftMB21dUuIS/L4+btsbq0n2UVdraL6XaBxlsvzcKQq /stX0mFgPgP/bRDiml9MgEclKdBSvZI7HuhH3gp/vVDVo+kGabHjnEslySki7XGv3FYa rLfYRy3dhSp6ygFSLNzGKcoqK5Uq1NUJWRGoTw3BFu5cTLZkNp3kp3XjnZla7S73Zlta 2VFPaXFdUyDpI2nrJAgNOwwWCda2WfTExMT34ZtjcORzzB5G5B4qR3A6u9RSNqHoAt0L gUcQ== X-Gm-Message-State: AOAM530r7hWBUleXbpTgLhzVgda39h34ktLScj7w/R4LLZfHmyDKPKGN YIbVmMM2LOOOIl6pfOaSFdB1BbZLStFW8nuS X-Google-Smtp-Source: ABdhPJyCcnxpWR4dFaC85jKD7bENEJ80SAoHMyrFnbQIWpGsXj8wt6LmpB61URonCWXxDcNOVVklIQ== X-Received: by 2002:adf:d1e2:: with SMTP id g2mr23919419wrd.346.1638052374975; Sat, 27 Nov 2021 14:32:54 -0800 (PST) Received: from localhost ([31.134.121.151]) by smtp.gmail.com with ESMTPSA id p12sm11761288wrr.10.2021.11.27.14.32.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 27 Nov 2021 14:32:54 -0800 (PST) From: Sam Protsenko To: Krzysztof Kozlowski , Rob Herring , Mark Brown , Greg Kroah-Hartman Cc: Jaewon Kim , Chanho Park , David Virag , Youngmin Nam , devicetree@vger.kernel.org, linux-spi@vger.kernel.org, linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-i2c@vger.kernel.org Subject: [PATCH 0/8] soc: samsung: Add USIv2 driver Date: Sun, 28 Nov 2021 00:32:45 +0200 Message-Id: <20211127223253.19098-1-semen.protsenko@linaro.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org USIv2 IP-core provides selectable serial protocol (UART, SPI or High-Speed I2C); only one can be chosen at a time. This series implements USIv2 driver, which allows one to select particular USI function in device tree, and also performs USI block initialization. With that driver implemented, it's not needed to do USI initialization in protocol drivers anymore, so that code is removed from the serial driver. Because USI driver is tristate (can be built as a module), serial driver was reworked so it's possible to use its console part as a module too. This way we can load serial driver module from user space and still have serial console functional. Make it impossible to build UART/SPI/I2C driver as a built-in when USIv2 driver built as a module: USIv2 configuration must be always done before tinkering with particular protocol it implements. Design features: - "reg" property contains USI registers start address (0xc0 offset); it's used in the driver to access USI_CON and USI_OPTION registers. This way all USI initialization (reset, HWACG, etc) can be done in USIv2 driver separately, rather than duplicating that code over UART/SPI/I2C drivers - System Register (system controller node) and its SW_CONF register offset are provided in "samsung,sysreg" property; it's used to select USI function (protocol to be used) - USI function is specified in "samsung,mode" property; integer value is used to simplify parsing - there is "samsung,clkreq-on" bool property, which makes driver disable HWACG control (needed for UART to work properly) - PCLK and IPCLK clocks are both provided to USI node; apparently both need to be enabled to access USI registers - protocol nodes are embedded (as a child nodes) in USI node; it allows correct init order, and reflects HW properly - USIv2 driver is a tristate: can be also useful from Android GKI requirements point of view - driver functions are implemented with further development in mind: we might want to add some SysFS interface later for example, or provide some functions to serial drivers with EXPORT_SYMBOL(), etc Sam Protsenko (8): dt-bindings: soc: samsung: Add Exynos USIv2 bindings dt-bindings: soc: samsung: Add Exynos USIv2 bindings doc soc: samsung: Add USIv2 driver tty: serial: samsung: Remove USI initialization tty: serial: samsung: Enable console as module tty: serial: Make SERIAL_SAMSUNG=y impossible when EXYNOS_USI_V2=m i2c: Make I2C_EXYNOS5=y impossible when EXYNOS_USI_V2=m spi: Make SPI_S3C64XX=y impossible when EXYNOS_USI_V2=m .../bindings/soc/samsung/exynos-usi-v2.yaml | 124 +++++++++ drivers/i2c/busses/Kconfig | 1 + drivers/soc/samsung/Kconfig | 14 + drivers/soc/samsung/Makefile | 2 + drivers/soc/samsung/exynos-usi-v2.c | 242 ++++++++++++++++++ drivers/spi/Kconfig | 1 + drivers/tty/serial/Kconfig | 3 +- drivers/tty/serial/samsung_tty.c | 57 ++--- .../dt-bindings/soc/samsung,exynos-usi-v2.h | 16 ++ include/linux/serial_s3c.h | 9 - 10 files changed, 425 insertions(+), 44 deletions(-) create mode 100644 Documentation/devicetree/bindings/soc/samsung/exynos-usi-v2.yaml create mode 100644 drivers/soc/samsung/exynos-usi-v2.c create mode 100644 include/dt-bindings/soc/samsung,exynos-usi-v2.h