Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756662Ab3GDNI1 (ORCPT ); Thu, 4 Jul 2013 09:08:27 -0400 Received: from mail-lb0-f179.google.com ([209.85.217.179]:49599 "EHLO mail-lb0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755321Ab3GDNIZ (ORCPT ); Thu, 4 Jul 2013 09:08:25 -0400 From: Jonas Jensen To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, arm@kernel.org, mturquette@linaro.org, Jonas Jensen Subject: [PATCH v2] clk: add MOXA ART SoCs clock driver Date: Thu, 4 Jul 2013 15:08:12 +0200 Message-Id: <1372943292-6960-1-git-send-email-jonas.jensen@gmail.com> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1372341834-6557-1-git-send-email-jonas.jensen@gmail.com> References: <1372341834-6557-1-git-send-email-jonas.jensen@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3442 Lines: 128 This patch adds MOXA ART SoCs clock driver support. Signed-off-by: Jonas Jensen --- Notes: of_clk_init(NULL) is now called from moxart machine descriptor .init_time hook. clocksource now depend on this to be loaded first. Applies to next-20130703 Changes since v1: 1. rewritten to register one fixed rate clock "clkapb" 2. use CLK_OF_DECLARE drivers/clk/Makefile | 1 + drivers/clk/clk-moxart.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 83 insertions(+) create mode 100644 drivers/clk/clk-moxart.c diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 4038c2b..933622f 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_COMMON_CLK) += clk-composite.o # SoCs specific obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835.o +obj-$(CONFIG_ARCH_MOXART) += clk-moxart.o obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o diff --git a/drivers/clk/clk-moxart.c b/drivers/clk/clk-moxart.c new file mode 100644 index 0000000..d61e305 --- /dev/null +++ b/drivers/clk/clk-moxart.c @@ -0,0 +1,82 @@ +/* + * MOXA ART SoCs clock driver. + * + * Copyright (C) 2013 Jonas Jensen + * + * Jonas Jensen + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static const struct of_device_id moxart_tclk_match[] = { + { .compatible = "moxa,moxart-apb-clock" }, + { } +}; + +void __init moxart_of_clk_init(struct device_node *node) +{ + static void __iomem *base; + struct device_node *clk_node; + struct clk *clk; + unsigned long rate; + unsigned int mul, val, div; + + base = of_iomap(node, 0); + if (IS_ERR(base)) + panic("%s: of_iomap failed\n", node->full_name); + + clk_node = of_find_matching_node(NULL, moxart_tclk_match); + if (!clk_node) + panic("%s: can't find clock DT node\n", node->full_name); + + mul = (readl(base + 0x30) >> 3) & 0x1ff; + val = (readl(base + 0x0c) >> 4) & 0x7; + + switch (val) { + case 1: + div = 3; + break; + case 2: + div = 4; + break; + case 3: + div = 6; + break; + case 4: + div = 8; + break; + default: + div = 2; + break; + } + + /* + * the rate calculation below is only tested and proven + * to be true for UC-7112-LX + * + * UC-7112-LX: mul=80 val=0 + * + * to support other moxart SoC hardware, this may need + * a change, though it's possible it works there too + */ + rate = (mul * 1200000 / div); + + clk = clk_register_fixed_rate(NULL, "clkapb", NULL, CLK_IS_ROOT, rate); + clk_register_clkdev(clk, NULL, "clkapb"); + of_clk_add_provider(clk_node, of_clk_src_simple_get, clk); + + iounmap(base); +} +CLK_OF_DECLARE(moxart_core_clock, "moxa,moxart-core-clock", moxart_of_clk_init); -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/