Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 168 insertions, 0 deletions

diff --git a/drivers/clk/clk-rk808.c b/drivers/clk/clk-rk808.c
new file mode 100644
index 000000000..6461f2820
--- /dev/null
+++ b/drivers/clk/clk-rk808.c
@@ -0,0 +1,168 @@
+/*
+ * Clkout driver for Rockchip RK808
+ *
+ * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Author:Chris Zhong <zyw@rock-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-provider.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/rk808.h>
+#include <linux/i2c.h>
+
+struct rk808_clkout {
+	struct rk808 *rk808;
+	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_clkout2_enable(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_enable(hw, true);
+}
+
+static void rk808_clkout2_unprepare(struct clk_hw *hw)
+{
+	rk808_clkout2_enable(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 = {
+	.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 struct clk_hw *
+of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
+{
+	struct rk808_clkout *rk808_clkout = data;
+	unsigned int idx = clkspec->args[0];
+
+	if (idx >= 2) {
+		pr_err("%s: invalid index %u\n", __func__, idx);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
+}
+
+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 rk808_clkout *rk808_clkout;
+	int ret;
+
+	rk808_clkout = devm_kzalloc(&client->dev,
+				    sizeof(*rk808_clkout), GFP_KERNEL);
+	if (!rk808_clkout)
+		return -ENOMEM;
+
+	rk808_clkout->rk808 = rk808;
+
+	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);
+
+	ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout1_hw);
+	if (ret)
+		return ret;
+
+	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);
+
+	ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout2_hw);
+	if (ret)
+		return ret;
+
+	return of_clk_add_hw_provider(node, of_clk_rk808_get, rk808_clkout);
+}
+
+static int rk808_clkout_remove(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;
+
+	of_clk_del_provider(node);
+
+	return 0;
+}
+
+static struct platform_driver rk808_clkout_driver = {
+	.probe = rk808_clkout_probe,
+	.remove = rk808_clkout_remove,
+	.driver		= {
+		.name	= "rk808-clkout",
+	},
+};
+
+module_platform_driver(rk808_clkout_driver);
+
+MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
+MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rk808-clkout");