From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754193AbaETQno (ORCPT ); Tue, 20 May 2014 12:43:44 -0400 Received: from mailout2.w1.samsung.com ([210.118.77.12]:33963 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754035AbaETQnk (ORCPT ); Tue, 20 May 2014 12:43:40 -0400 X-AuditID: cbfec7f5-b7f626d000004b39-72-537b8639c04d From: Tomasz Figa To: linux-samsung-soc@vger.kernel.org Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Mike Turquette , Kukjin Kim , Rob Herring , Mark Rutland , Marek Szyprowski , Tushar Behera , Pankaj Dubey , Rahul Sharma , Mark Brown , Tomasz Figa , Tomasz Figa Subject: [PATCH 0/4] Add support for Exynos clock output configuration Date: Tue, 20 May 2014 18:43:27 +0200 Message-id: <1400604211-9447-1-git-send-email-t.figa@samsung.com> X-Mailer: git-send-email 1.9.3 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupnluLIzCtJLcpLzFFi42I5/e/4NV3Ltupgg/Y1QhZTHz5hs5h/5Byr Re+Cq2wWmx5fY7W4vGsOm8WM8/uYLNYeuctusfT6RSaLpxMuslks2vqF3WLKosOsFq17j7Bb rJ/xmsVi1a4/jBbtf/eyOfB7rJm3htFj56y77B6bVnWyedy5tofNY/OSeo++LasYPT5vkgtg j+KySUnNySxLLdK3S+DKmDPlCFvBMtGK8+cWsTcw/uPvYuTkkBAwkbgw8xcLhC0mceHeejYQ W0hgKaPE3EbpLkYuILuPSeLYuzuMIAk2ATWJzw2PwIpEBFQlPrctYAcpYhaYxiKxalk7O0hC WMBN4vCeS8wgNgtQ0f7fW8E28Ao4Spw4f5cdYpucRO+2N8wTGLkXMDKsYhRNLU0uKE5KzzXS K07MLS7NS9dLzs/dxAgJxK87GJceszrEKMDBqMTDK5FaFSzEmlhWXJl7iFGCg1lJhNc+uDpY iDclsbIqtSg/vqg0J7X4ECMTB6dUAyPHh/z3WsXTLEw/3nvvfb2WxSvvVvaN3BmNPzjXe6qc uKEX5G5pLKxlOsHlunXRXYEXLk27axLC7rBzPhec9974iMK7pV6HwxqWsVwt5jdRZg4QK7lr GfWX49BHl9bKFZObJgW9VCtfnB5uMKFtfq54+5trP5neSP27uT7yaNmMbumkwAsXLJVYijMS DbWYi4oTARXPVxUiAgAA Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On all Exynos SoCs there is a dedicated CLKOUT pin that allows many of internal SoC clocks to be output from the SoC. The hardware structure of CLKOUT related clocks looks as follows: CMU |---> clock0 ---------> | PMU | | | | several |---> clock1 ---------> | mux | muxes | | + |---> CLKOUT dividers | ... | gate | and gates | | | |---> clockN ---------> | | Since the block responsible for handling the pin is PMU, not CMU, a separate driver, that binds to PMU node is required and acquires all input clocks by standard DT clock look-up. This way we don't need any cross-IP block drivers and cross-driver register sharing or nodes for fake devices. To represent the PMU mux/gate clock, generic composite clock is registered. Tested on Odroid U3, with HSIC/USB hub using CLKOUT as reference clock, with some additional patches. Depends on: [PATCHv5 0/4] Enable usbphy and hsotg for exynos4 (No link, sorry, I could not find it in any archive yet...) for Exynos4210/4x12 PMU binding and DT nodes. Changes since RFC v1: (https://lkml.org/lkml/2014/5/15/506) - rebased onto v5 of "Enable usbphy and hsotg for exynos4" series and current HEAD of samsung-clk tree, - added handling of suspend/resume in the driver, - added missing CPU clocks on Exynos4, - added CLK_SET_RATE_PARENT to CMU CLKOUT gates on Exynos4, - fixed bit field width on Exynos4, - added CLKOUT CMU registers of Exynos4 to save/restore list, - added CLK_SET_RATE_PARENT and CLK_SET_RATE_NO_REPARENT to clkout clock, - changed the binding to use 1-cell clock specifier to allow extension with further PMU clocks in future, if needed. Tomasz Figa (4): clk: samsung: exynos4: Add missing CPU/DMC clock hierarchy clk: samsung: exynos4: Add CLKOUT clock hierarchy clk: samsung: Add driver to control CLKOUT line on Exynos SoCs ARM: dts: exynos: Update PMU node with CLKOUT related data .../devicetree/bindings/arm/samsung/pmu.txt | 30 ++++ arch/arm/boot/dts/exynos4.dtsi | 1 + arch/arm/boot/dts/exynos4210.dtsi | 9 ++ arch/arm/boot/dts/exynos4x12.dtsi | 6 + arch/arm/boot/dts/exynos5250.dtsi | 3 + arch/arm/boot/dts/exynos5420.dtsi | 3 + drivers/clk/samsung/Makefile | 1 + drivers/clk/samsung/clk-exynos-clkout.c | 153 ++++++++++++++++++ drivers/clk/samsung/clk-exynos4.c | 173 +++++++++++++++++++++ include/dt-bindings/clock/exynos4.h | 6 + 10 files changed, 385 insertions(+) create mode 100644 drivers/clk/samsung/clk-exynos-clkout.c -- 1.9.3