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Message-Id: <1408506009-29923-1-git-send-email-zyw@rock-chips.com>
Date: Wed, 20 Aug 2014 11:40:09 +0800
From: Chris Zhong <zyw@...k-chips.com>
To: robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
sameo@...ux.intel.com, lee.jones@...aro.org, lgirdwood@...il.com,
broonie@...nel.org, a.zummo@...ertech.it, mturquette@...aro.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
rtc-linux@...glegroups.com, grant.likely@...aro.org,
hl@...k-chips.com, huangtao@...k-chips.com, cf@...k-chips.com,
zhangqing@...k-chips.com, xxx@...k-chips.com,
dianders@...omium.org, heiko@...ech.de, olof@...om.net,
sonnyrao@...omium.org, dtor@...omium.org,
javier.martinez@...labora.co.uk, kever.yang@...k-chips.com,
Chris Zhong <zyw@...k-chips.com>
Subject: [PATCH v2 5/5] Clk: RK808: Add clkout driver for RK808
Signed-off-by: Chris Zhong <zyw@...k-chips.com>
---
Changes in v2: None
drivers/clk/Kconfig | 9 +++
drivers/clk/Makefile | 1 +
drivers/clk/clk-rk808.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 156 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..8d0467a
--- /dev/null
+++ b/drivers/clk/clk-rk808.c
@@ -0,0 +1,146 @@
+/*
+ * Clkout driver for Rockchip RK808
+ *
+ * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Author: Chris Zhong <zyw@...k-chips.com>
+ * Author: Zhang Qing <zhangqing@...k-chips.com>
+ *
+ * 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 <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/rk808>
+
+struct rk808_clk {
+ 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_clk *rk808_clk = container_of(hw, struct rk808_clk,
+ clkout2_hw);
+ struct rk808 *rk808 = rk808_clk->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, 1);
+}
+
+static void rk808_clkout2_unprepare(struct clk_hw *hw)
+{
+ rk808_clkout2_control(hw, 0);
+}
+
+static int rk808_clkout2_is_prepared(struct clk_hw *hw)
+{
+ struct rk808_clk *rk808_clk = container_of(hw, struct rk808_clk,
+ clkout2_hw);
+ struct rk808 *rk808 = rk808_clk->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_clk_probe(struct platform_device *pdev)
+{
+ struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
+ struct clk_init_data init;
+ struct clk **clk_table;
+ struct rk808_clk *clkdata;
+ struct device_node *node = client->dev.of_node;
+ int ret;
+
+ clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL);
+ if (!clkdata)
+ return -ENOMEM;
+
+ clkdata->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;
+ clkdata->clkout1_hw.init = &init;
+ clk_table[0] = devm_clk_register(&pdev->dev, &clkdata->clkout1_hw);
+
+ init.name = "rk808-clkout2";
+ init.ops = &rk808_clkout2_ops;
+ clkdata->clkout2_hw.init = &init;
+ clk_table[1] = devm_clk_register(&pdev->dev, &clkdata->clkout2_hw);
+
+ clk_data->clks = clk_table;
+ clk_data->clk_num = 2;
+ of_clk_add_provider(node, of_clk_src_onecell_get, clk_table)
+
+ return 0;
+}
+
+static struct platform_driver rk808_clk_driver = {
+ .probe = rk808_clk_probe,
+ .driver = {
+ .name = "rk808-clkout",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(rk808_clk_driver);
+
+MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
+MODULE_AUTHOR("Chris Zhong <zyw@...k-chips.com>");
+MODULE_AUTHOR("Zhang Qing <zhanqging@...k-chips.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rk808-clk")
--
1.7.9.5
--
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