From patchwork Wed Aug 1 08:19:49 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris Brezillon X-Patchwork-Id: 10551857 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0A64C13BB for ; Wed, 1 Aug 2018 08:35:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ECF1C2AE75 for ; Wed, 1 Aug 2018 08:35:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DECCC2AEC1; Wed, 1 Aug 2018 08:35:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 001892AE75 for ; Wed, 1 Aug 2018 08:35:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Owner; bh=DN4mLY7dxBY8gJoBEeDyHuRDGGOLubeBTnHBJqwEYsY=; b=SXh 4nIuYWE37sGKrZ+bKtug1VTyOQoUcMeB70RrXl1o4/aV3lkqO8hQ9tm2ij6JLIblUQWbfGVcdpTHf krVmx/gvCCd8bDXQjl9ml1RagLWdiTtxcv9lJWspHOZ2AMig9kFT5NwpcXehnlZ+wWKPNg0pFs3Wl tYAVMmPlg+55TNnwleGj7VP9vDmMZp/6WGcnYBwvm1H0N85kxJF1eFldc6ktKgXunrPK2jG8X0RPZ DUO1hoJhJBo0GhQm+wK2fAZj4xLnVHc2G4NATb6eEvbPmXnWbSEiUZFbvDdfGyg8YOScnnOPPq+Zc QdgZW3rqXuLvuuUhEuQyOYmCEVaZS0Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fkmbB-0006Uz-TD; Wed, 01 Aug 2018 08:35:13 +0000 Received: from mail.bootlin.com ([62.4.15.54]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fkmMY-0006ut-QB for linux-arm-kernel@lists.infradead.org; Wed, 01 Aug 2018 08:20:11 +0000 Received: by mail.bootlin.com (Postfix, from userid 110) id 71643207B7; Wed, 1 Aug 2018 10:19:53 +0200 (CEST) Received: from localhost.localdomain (AAubervilliers-681-1-89-120.w90-88.abo.wanadoo.fr [90.88.30.120]) by mail.bootlin.com (Postfix) with ESMTPSA id F236520741; Wed, 1 Aug 2018 10:19:52 +0200 (CEST) From: Boris Brezillon To: Mike Turquette , Stephen Boyd , linux-clk@vger.kernel.org Subject: [PATCH 1/2] clk: Add a driver for the Xilinx Clocking Wizard block Date: Wed, 1 Aug 2018 10:19:49 +0200 Message-Id: <20180801081950.10497-1-boris.brezillon@bootlin.com> X-Mailer: git-send-email 2.14.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180801_012007_341976_66D2B339 X-CRM114-Status: GOOD ( 20.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Pawel Moll , Ian Campbell , Julien Su , Michal Simek , Boris Brezillon , Rob Herring , Kumar Gala , Mason Yang , linux-arm-kernel@lists.infradead.org, zhengxunli@mxic.com.tw MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add a clk driver for Xilinx Clocking Wizard IP. Signed-off-by: Boris Brezillon --- drivers/clk/Kconfig | 1 + drivers/clk/zynq/Kconfig | 5 + drivers/clk/zynq/Makefile | 2 + drivers/clk/zynq/clk-wizard.c | 408 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 416 insertions(+) create mode 100644 drivers/clk/zynq/Kconfig create mode 100644 drivers/clk/zynq/clk-wizard.c diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 721572a8c429..6c14f48b4f19 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -293,5 +293,6 @@ source "drivers/clk/sunxi-ng/Kconfig" source "drivers/clk/tegra/Kconfig" source "drivers/clk/ti/Kconfig" source "drivers/clk/uniphier/Kconfig" +source "drivers/clk/zynq/Kconfig" endmenu diff --git a/drivers/clk/zynq/Kconfig b/drivers/clk/zynq/Kconfig new file mode 100644 index 000000000000..654d72ef0349 --- /dev/null +++ b/drivers/clk/zynq/Kconfig @@ -0,0 +1,5 @@ +config CLK_ZYNQ_CLK_WIZARD + tristate "Xilinx clocking wizard driver" + depends on ARCH_ZYNQ || COMPILE_TEST + help + Enable the driver for Xilinx clocking wizard IP. diff --git a/drivers/clk/zynq/Makefile b/drivers/clk/zynq/Makefile index 0afc2e7cc5c1..ac2a5e09fad9 100644 --- a/drivers/clk/zynq/Makefile +++ b/drivers/clk/zynq/Makefile @@ -1,3 +1,5 @@ # Zynq clock specific Makefile obj-y += clkc.o pll.o + +obj-$(CONFIG_CLK_ZYNQ_CLK_WIZARD) += clk-wizard.o diff --git a/drivers/clk/zynq/clk-wizard.c b/drivers/clk/zynq/clk-wizard.c new file mode 100644 index 000000000000..07a60ab78133 --- /dev/null +++ b/drivers/clk/zynq/clk-wizard.c @@ -0,0 +1,408 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Zynq Clocking Wizard driver + * + * Copyright (C) 2018 Macronix + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define SRR 0x0 + +#define SR 0x4 +#define SR_LOCKED BIT(0) + +#define CCR(x) (0x200 + ((x) * 4)) + +#define FBOUT_CFG CCR(0) +#define FBOUT_DIV(x) (x) +#define FBOUT_GET_DIV(x) ((x) & GENMASK(7, 0)) +#define FBOUT_MUL(x) ((x) << 8) +#define FBOUT_GET_MUL(x) (((x) & GENMASK(15, 8)) >> 8) +#define FBOUT_FRAC(x) ((x) << 16) +#define FBOUT_GET_FRAC(x) (((x) & GENMASK(25, 16)) >> 16) +#define FBOUT_FRAC_EN BIT(26) + +#define FBOUT_PHASE CCR(1) + +#define OUT_CFG(x) CCR(2 + ((x) * 3)) +#define OUT_DIV(x) (x) +#define OUT_GET_DIV(x) ((x) & GENMASK(7, 0)) +#define OUT_FRAC(x) ((x) << 8) +#define OUT_GET_FRAC(x) (((x) & GENMASK(17, 8)) >> 8) +#define OUT_FRAC_EN BIT(18) + +#define OUT_PHASE(x) CCR(3 + ((x) * 3)) +#define OUT_DUTY(x) CCR(4 + ((x) * 3)) + +#define CTRL CCR(23) +#define CTRL_SEN BIT(2) +#define CTRL_SADDR BIT(1) +#define CTRL_LOAD BIT(0) + +struct clkwzd; + +struct clkwzd_fbout { + struct clk_hw base; + struct clkwzd *wzd; +}; + +static inline struct clkwzd_fbout *to_clkwzd_fbout(struct clk_hw *hw) +{ + return container_of(hw, struct clkwzd_fbout, base); +} + +struct clkwzd_out { + struct clk_hw base; + struct clkwzd *wzd; + unsigned int id; +}; + +static inline struct clkwzd_out *to_clkwzd_out(struct clk_hw *hw) +{ + return container_of(hw, struct clkwzd_out, base); +} + +#define CLKWZD_MAX_OUTPUT 7 + +struct clkwzd { + struct mutex lock; + struct clk *aclk; + struct clk *clk_in1; + void __iomem *regs; + struct clkwzd_out out[CLKWZD_MAX_OUTPUT]; + struct clkwzd_fbout fbout; + struct clk_hw_onecell_data *onecell; +}; + +static int clkwzd_is_locked(struct clkwzd *wzd) +{ + bool prepared; + + mutex_lock(&wzd->lock); + prepared = readl(wzd->regs + SR) & SR_LOCKED; + mutex_unlock(&wzd->lock); + + return prepared; +} + +static int clkwzd_apply_conf(struct clkwzd *wzd) +{ + int ret; + u32 val; + + mutex_lock(&wzd->lock); + ret = readl_poll_timeout(wzd->regs + SR, val, val & SR_LOCKED, 1, 100); + if (!ret) { + writel(CTRL_SEN | CTRL_SADDR | CTRL_LOAD, wzd->regs + CTRL); + writel(CTRL_SADDR, wzd->regs + CTRL); + ret = readl_poll_timeout(wzd->regs + SR, val, val & SR_LOCKED, + 1, 100); + } + mutex_unlock(&wzd->lock); + + return 0; +} + +static int clkwzd_fbout_is_prepared(struct clk_hw *hw) +{ + struct clkwzd_fbout *fbout = to_clkwzd_fbout(hw); + + return clkwzd_is_locked(fbout->wzd); +} + +static int clkwzd_fbout_prepare(struct clk_hw *hw) +{ + struct clkwzd_fbout *fbout = to_clkwzd_fbout(hw); + + return clkwzd_apply_conf(fbout->wzd); +} + +static unsigned long clkwzd_fbout_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clkwzd_fbout *fbout = to_clkwzd_fbout(hw); + unsigned long rate; + u32 cfg; + + cfg = readl(fbout->wzd->regs + FBOUT_CFG); + if (cfg & FBOUT_FRAC_EN) + rate = DIV_ROUND_DOWN_ULL((u64)parent_rate * + ((FBOUT_GET_MUL(cfg) * 1000) + + FBOUT_GET_FRAC(cfg)), + 1000); + else + rate = parent_rate * FBOUT_GET_MUL(cfg); + + rate /= FBOUT_GET_DIV(cfg); + + return rate; +} + +static int clkwzd_fbout_set_phase(struct clk_hw *hw, int degrees) +{ + struct clkwzd_fbout *fbout = to_clkwzd_fbout(hw); + + writel(degrees * 1000, fbout->wzd->regs + FBOUT_PHASE); + + return 0; +} + +static int clkwzd_fbout_get_phase(struct clk_hw *hw) +{ + struct clkwzd_fbout *fbout = to_clkwzd_fbout(hw); + + return readl(fbout->wzd->regs + FBOUT_PHASE) / 1000; +} + +const struct clk_ops fbout_ops = { + .is_prepared = clkwzd_fbout_is_prepared, + .prepare = clkwzd_fbout_prepare, + .recalc_rate = clkwzd_fbout_recalc_rate, + .set_phase = clkwzd_fbout_set_phase, + .get_phase = clkwzd_fbout_get_phase, +}; + +static int clkwzd_out_is_prepared(struct clk_hw *hw) +{ + struct clkwzd_out *out = to_clkwzd_out(hw); + + return clkwzd_is_locked(out->wzd); +} + +static int clkwzd_out_prepare(struct clk_hw *hw) +{ + struct clkwzd_out *out = to_clkwzd_out(hw); + + return clkwzd_apply_conf(out->wzd); +} + +static unsigned long clkwzd_out_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clkwzd_out *out = to_clkwzd_out(hw); + unsigned long rate; + u32 cfg; + + cfg = readl(out->wzd->regs + OUT_CFG(out->id)); + if (cfg & OUT_FRAC_EN) + rate = DIV_ROUND_DOWN_ULL((u64)parent_rate * 1000, + ((OUT_GET_DIV(cfg) * 1000) + + OUT_GET_FRAC(cfg))); + else + rate = parent_rate / OUT_GET_DIV(cfg); + + return rate; +} + +static int clkwzd_out_set_rate(struct clk_hw *hw, + unsigned long rate, + unsigned long parent_rate) +{ + struct clkwzd_out *out = to_clkwzd_out(hw); + u64 div; + u32 cfg; + + div = DIV_ROUND_DOWN_ULL((u64)parent_rate * 1000, rate); + if (div < 1000 || div > 255999) + return -EINVAL; + + cfg = OUT_DIV((u32)div / 1000); + + if ((u32)div % 1000) + cfg |= OUT_FRAC_EN | OUT_FRAC((u32)div % 1000); + + writel(cfg, out->wzd->regs + OUT_CFG(out->id)); + + /* Set duty cycle to 50%. */ + writel(50000, out->wzd->regs + OUT_DUTY(out->id)); + + return 0; +} + +static long clkwzd_out_round_rate(struct clk_hw *hw, + unsigned long rate, + unsigned long *parent_rate) +{ + u64 div; + + div = DIV_ROUND_CLOSEST_ULL((u64)(*parent_rate) * 1000, rate); + if (div < 1000) + return *parent_rate; + + if (div > 255999) + div = 255999; + + return DIV_ROUND_DOWN_ULL((u64)(*parent_rate) * 1000, (u32)div); +} + +static int clkwzd_out_set_phase(struct clk_hw *hw, int degrees) +{ + struct clkwzd_out *out = to_clkwzd_out(hw); + + writel(degrees * 1000, out->wzd->regs + OUT_PHASE(out->id)); + + return 0; +} + +static int clkwzd_out_get_phase(struct clk_hw *hw) +{ + struct clkwzd_out *out = to_clkwzd_out(hw); + + return readl(out->wzd->regs + OUT_PHASE(out->id)) / 1000; +} + +static const struct clk_ops out_ops = { + .is_prepared = clkwzd_out_is_prepared, + .prepare = clkwzd_out_prepare, + .recalc_rate = clkwzd_out_recalc_rate, + .round_rate = clkwzd_out_round_rate, + .set_rate = clkwzd_out_set_rate, + .set_phase = clkwzd_out_set_phase, + .get_phase = clkwzd_out_get_phase, +}; + +static int zynq_clkwzd_probe(struct platform_device *pdev) +{ + struct clk_init_data fboutinit = { }; + const char *clk_in_name; + struct resource *res; + struct clkwzd *wzd; + u32 i, noutputs = 0; + int ret; + + wzd = devm_kzalloc(&pdev->dev, sizeof(*wzd), GFP_KERNEL); + if (!wzd) + return -ENOMEM; + + wzd->aclk = devm_clk_get(&pdev->dev, "aclk"); + if (IS_ERR(wzd->aclk)) + return PTR_ERR(wzd->aclk); + + wzd->clk_in1 = devm_clk_get(&pdev->dev, "clk_in1"); + if (IS_ERR(wzd->clk_in1)) + return PTR_ERR(wzd->clk_in1); + + of_property_read_u32(pdev->dev.of_node, "xlnx,clk-wizard-num-outputs", + &noutputs); + if (!noutputs || noutputs >= CLKWZD_MAX_OUTPUT) + return -EINVAL; + + wzd->onecell = devm_kzalloc(&pdev->dev, + sizeof(*wzd->onecell) + + (sizeof(*wzd->onecell->hws) * noutputs), + GFP_KERNEL); + if (!wzd->onecell) + return -ENOMEM; + + clk_in_name = __clk_get_name(wzd->clk_in1); + if (!clk_in_name) + return -EINVAL; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + wzd->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(wzd->regs)) + return PTR_ERR(wzd->regs); + + mutex_init(&wzd->lock); + + wzd->fbout.wzd = wzd; + fboutinit.ops = &fbout_ops; + fboutinit.flags = CLK_SET_RATE_GATE; + fboutinit.num_parents = 1; + fboutinit.parent_names = &clk_in_name; + fboutinit.flags = CLK_SET_RATE_GATE; + + fboutinit.name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s-fbout", + dev_name(&pdev->dev)); + if (!fboutinit.name) + return -ENOMEM; + + ret = clk_prepare_enable(wzd->aclk); + if (ret) + return ret; + + wzd->fbout.base.init = &fboutinit; + ret = devm_clk_hw_register(&pdev->dev, &wzd->fbout.base); + if (ret) + goto err_disable_aclk; + + for (i = 0; i < noutputs; i++) { + struct clk_init_data outinit = { }; + + wzd->out[i].id = i; + wzd->out[i].wzd = wzd; + outinit.ops = &out_ops; + outinit.num_parents = 1; + outinit.parent_names = &fboutinit.name; + outinit.flags = CLK_SET_RATE_GATE; + wzd->out[i].base.init = &outinit; + outinit.name = devm_kasprintf(&pdev->dev, GFP_KERNEL, + "%s-out%d", + dev_name(&pdev->dev), i); + if (!outinit.name) { + ret = -ENOMEM; + goto err_disable_aclk; + } + + ret = devm_clk_hw_register(&pdev->dev, &wzd->out[i].base); + if (ret) + goto err_disable_aclk; + + wzd->onecell->hws[i] = &wzd->out[i].base; + } + + wzd->onecell->num = noutputs; + ret = devm_of_clk_add_hw_provider(&pdev->dev, + of_clk_hw_onecell_get, + wzd->onecell); + if (ret) + goto err_disable_aclk; + + platform_set_drvdata(pdev, wzd); + + return 0; + +err_disable_aclk: + clk_disable_unprepare(wzd->aclk); + + return ret; +} + +static int zynq_clkwzd_remove(struct platform_device *pdev) +{ + struct clkwzd *wzd = platform_get_drvdata(pdev); + + clk_disable_unprepare(wzd->aclk); + + return 0; +} + +static const struct of_device_id zynq_clkwzd_of_ids[] = { + { .compatible = "xlnx,clk-wizard-5.1" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, zynq_clkwzd_of_ids); + +static struct platform_driver zynq_clkwzd_driver = { + .probe = zynq_clkwzd_probe, + .remove = zynq_clkwzd_remove, + .driver = { + .name = "zynq-clk-wizard", + .of_match_table = zynq_clkwzd_of_ids, + }, +}; +module_platform_driver(zynq_clkwzd_driver); + +MODULE_AUTHOR("Boris Brezillon "); +MODULE_DESCRIPTION("Xilinx Clocking Wizard driver"); +MODULE_LICENSE("GPL"); From patchwork Wed Aug 1 08:19:50 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris Brezillon X-Patchwork-Id: 10551837 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4A8449093 for ; Wed, 1 Aug 2018 08:20:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3BD452AC33 for ; Wed, 1 Aug 2018 08:20:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2FB602AEC1; Wed, 1 Aug 2018 08:20:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D78F62AC33 for ; 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Wed, 01 Aug 2018 08:20:18 +0000 Received: from mail.bootlin.com ([62.4.15.54]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fkmMY-0006uu-QD for linux-arm-kernel@lists.infradead.org; Wed, 01 Aug 2018 08:20:10 +0000 Received: by mail.bootlin.com (Postfix, from userid 110) id AF02F20799; Wed, 1 Aug 2018 10:19:53 +0200 (CEST) Received: from localhost.localdomain (AAubervilliers-681-1-89-120.w90-88.abo.wanadoo.fr [90.88.30.120]) by mail.bootlin.com (Postfix) with ESMTPSA id 57BA62074F; Wed, 1 Aug 2018 10:19:53 +0200 (CEST) From: Boris Brezillon To: Mike Turquette , Stephen Boyd , linux-clk@vger.kernel.org Subject: [PATCH 2/2] dt-bindings: clock: Add bindings for the Clocking Wizard IP Date: Wed, 1 Aug 2018 10:19:50 +0200 Message-Id: <20180801081950.10497-2-boris.brezillon@bootlin.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20180801081950.10497-1-boris.brezillon@bootlin.com> References: <20180801081950.10497-1-boris.brezillon@bootlin.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180801_012007_244397_E7E28A20 X-CRM114-Status: GOOD ( 15.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Pawel Moll , Ian Campbell , Julien Su , Michal Simek , Boris Brezillon , Rob Herring , Kumar Gala , Mason Yang , linux-arm-kernel@lists.infradead.org, zhengxunli@mxic.com.tw MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Document Xilinx Clocking Wizard bindings. Signed-off-by: Boris Brezillon Reviewed-by: Rob Herring --- .../devicetree/bindings/clock/xlnx,clk-wizard.txt | 28 ++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/xlnx,clk-wizard.txt diff --git a/Documentation/devicetree/bindings/clock/xlnx,clk-wizard.txt b/Documentation/devicetree/bindings/clock/xlnx,clk-wizard.txt new file mode 100644 index 000000000000..1bf7a764f4a9 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/xlnx,clk-wizard.txt @@ -0,0 +1,28 @@ +Device Tree Clock bindings for the "Clocking Wizard" IP provided by Xilinx + +This block can be used to generate up to 4 clock signals out of a single input +clock. It embeds a PLL to generate an intermediate clock which then feeds 4 +clock dividers whose divider value can be adjusted based on the user needs. + +Required properties: + - #clock-cells: must be 1. The cell is encoding the id of the output clk + (from 0 to xlnx,clk-wizard-num-outputs - 1) + - compatible: must be "xlnx,clk-wizard-5.1" + - clocks: 2 clocks are required + - clock-names: should contain 2 clock names: "aclk" and "clkin". + "aclk" is driving the register interface and "clk_in" is the + input clock signal that is used by the PLL block + - xlnx,clk-wizard-num-outputs: this describe the number of output clocks + (chosen at synthesization time) + - reg: registers used to configure the Clocking wizard block + +Example: + + clkwizard: clkwizard@43c20000 { + compatible = "xlnx,clk-wizard-5.1"; + reg = <0x43c20000 0x10000>; + clocks = <&clkc 18>, <&clkc 18>; + clock-names = "aclk", "clk_in1"; + #clock-cells = <1>; + xlnx,clk-wizard-num-outputs = <2>; + };