From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753254AbaIAJrA (ORCPT ); Mon, 1 Sep 2014 05:47:00 -0400 Received: from va-smtp01.263.net ([54.88.144.211]:33774 "EHLO vasmtpcom.263.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752377AbaIAJq7 (ORCPT ); Mon, 1 Sep 2014 05:46:59 -0400 X-RL-SENDER: zyw@rock-chips.com X-FST-TO: robh+dt@kernel.org X-SENDER-IP: 127.0.0.1 X-LOGIN-NAME: zyw@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 1 From: Chris Zhong To: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, sameo@linux.intel.com, lee.jones@linaro.org, lgirdwood@gmail.com, a.zummo@towertech.it, mturquette@linaro.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, rtc-linux@googlegroups.com, grant.likely@linaro.org, hl@rock-chips.com, huangtao@rock-chips.com, cf@rock-chips.com, zhangqing@rock-chips.com, xxx@rock-chips.com, dianders@chromium.org, heiko@sntech.de, olof@lixom.net, sonnyrao@chromium.org, dtor@chromium.org, javier.martinez@collabora.co.uk, kever.yang@rock-chips.com, Chris Zhong Subject: [PATCH v7 4/5] clk: RK808: Add clkout driver for RK808 Date: Mon, 1 Sep 2014 17:46:40 +0800 Message-Id: <1409564800-18477-1-git-send-email-zyw@rock-chips.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1409562468-16586-1-git-send-email-zyw@rock-chips.com> References: <1409562468-16586-1-git-send-email-zyw@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Chris Zhong Reviewed-by: Doug Anderson Tested-by: Doug Anderson --- Changes in v7: Adviced by doug -fix coding style problems Changes in v6: Adviced by doug - use correct argument call of_clk_add_provider in probe Changes in v5: Adviced by doug - add some error checking in probe - move "rockchip,rk808.h" into the patch about dt-bindings Changes in v4: Adviced by doug - add "clock-output-names" propertiey - add a header file "rockchip,rk808.h" Changes in v3: - fix compile err Changes in v2: Adviced by javier.martinez - separated from rtc-rk808.c drivers/clk/Kconfig | 9 +++ drivers/clk/Makefile | 1 + drivers/clk/clk-rk808.c | 160 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 170 insertions(+) create mode 100644 drivers/clk/clk-rk808.c diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index cfd3af7..84e0590 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -38,6 +38,15 @@ config COMMON_CLK_MAX77686 ---help--- This driver supports Maxim 77686 crystal oscillator clock. +config COMMON_CLK_RK808 + tristate "Clock driver for RK808" + depends on MFD_RK808 + ---help--- + This driver supports RK808 crystal oscillator clock. These + multi-function devices have two fixed-rate oscillators, + clocked at 32KHz each. Clkout1 is always on, Clkout2 can off + by control register. + config COMMON_CLK_SI5351 tristate "Clock driver for SiLabs 5351A/B/C" depends on I2C diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index f537a0b..99f53d5 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o obj-$(CONFIG_COMMON_CLK_PALMAS) += clk-palmas.o obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o +obj-$(CONFIG_COMMON_CLK_RK808) += clk-rk808.o obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o obj-$(CONFIG_COMMON_CLK_SI570) += clk-si570.o diff --git a/drivers/clk/clk-rk808.c b/drivers/clk/clk-rk808.c new file mode 100644 index 0000000..88f020b --- /dev/null +++ b/drivers/clk/clk-rk808.c @@ -0,0 +1,160 @@ +/* + * Clkout driver for Rockchip RK808 + * + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include +#include +#include +#include +#include +#include +#include + +struct rk808_clkout { + struct rk808 *rk808; + struct clk_onecell_data clk_data; + struct clk_hw clkout1_hw; + struct clk_hw clkout2_hw; +}; + +static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + return 32768; +} + +static int rk808_clkout1_is_prepared(struct clk_hw *hw) +{ + return 1; +} + +static int rk808_clkout2_control(struct clk_hw *hw, bool enable) +{ + struct rk808_clkout *rk808_clkout = container_of(hw, + struct rk808_clkout, + clkout2_hw); + struct rk808 *rk808 = rk808_clkout->rk808; + + return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG, + CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0); +} + +static int rk808_clkout2_prepare(struct clk_hw *hw) +{ + return rk808_clkout2_control(hw, true); +} + +static void rk808_clkout2_unprepare(struct clk_hw *hw) +{ + rk808_clkout2_control(hw, false); +} + +static int rk808_clkout2_is_prepared(struct clk_hw *hw) +{ + struct rk808_clkout *rk808_clkout = container_of(hw, + struct rk808_clkout, + clkout2_hw); + struct rk808 *rk808 = rk808_clkout->rk808; + uint32_t val; + + int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val); + + if (ret < 0) + return ret; + + return (val & CLK32KOUT2_EN) ? 1 : 0; +} + +static const struct clk_ops rk808_clkout1_ops = { + .is_prepared = rk808_clkout1_is_prepared, + .recalc_rate = rk808_clkout_recalc_rate, +}; + +static const struct clk_ops rk808_clkout2_ops = { + .prepare = rk808_clkout2_prepare, + .unprepare = rk808_clkout2_unprepare, + .is_prepared = rk808_clkout2_is_prepared, + .recalc_rate = rk808_clkout_recalc_rate, +}; + +static int rk808_clkout_probe(struct platform_device *pdev) +{ + struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent); + struct i2c_client *client = rk808->i2c; + struct device_node *node = client->dev.of_node; + struct clk_init_data init = {}; + struct clk **clk_table; + struct rk808_clkout *rk808_clkout; + + rk808_clkout = devm_kzalloc(&client->dev, + sizeof(*rk808_clkout), GFP_KERNEL); + if (!rk808_clkout) + return -ENOMEM; + + rk808_clkout->rk808 = rk808; + + clk_table = devm_kzalloc(&client->dev, + 2 * sizeof(struct clk *), GFP_KERNEL); + if (!clk_table) + return -ENOMEM; + + init.flags = CLK_IS_ROOT; + init.parent_names = NULL; + init.num_parents = 0; + init.name = "rk808-clkout1"; + init.ops = &rk808_clkout1_ops; + rk808_clkout->clkout1_hw.init = &init; + + /* optional override of the clockname */ + of_property_read_string_index(node, "clock-output-names", + 0, &init.name); + + clk_table[0] = devm_clk_register(&client->dev, + &rk808_clkout->clkout1_hw); + if (IS_ERR(clk_table[0])) + return PTR_ERR(clk_table[0]); + + init.name = "rk808-clkout2"; + init.ops = &rk808_clkout2_ops; + rk808_clkout->clkout2_hw.init = &init; + + /* optional override of the clockname */ + of_property_read_string_index(node, "clock-output-names", + 1, &init.name); + + clk_table[1] = devm_clk_register(&client->dev, + &rk808_clkout->clkout2_hw); + if (IS_ERR(clk_table[1])) + return PTR_ERR(clk_table[1]); + + rk808_clkout->clk_data.clks = clk_table; + rk808_clkout->clk_data.clk_num = 2; + + return of_clk_add_provider(node, of_clk_src_onecell_get, + &rk808_clkout->clk_data); +} + +static struct platform_driver rk808_clkout_driver = { + .probe = rk808_clkout_probe, + .driver = { + .name = "rk808-clkout", + }, +}; + +module_platform_driver(rk808_clkout_driver); + +MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs"); +MODULE_AUTHOR("Chris Zhong "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:rk808-clkout"); -- 1.7.9.5