clk: RK808: Add RK809 and RK817 support.

RK809 and RK817 are power management IC chips for multimedia products.
most of their functions and registers are same, including the clkout
funciton.
Signed-off-by: Tony Xie <tony.xie@rock-chips.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/clk/Kconfig

@@ -53,13 +53,12 @@ config COMMON_CLK_MAX9485
 	  This driver supports Maxim 9485 Programmable Audio Clock Generator
 
 config COMMON_CLK_RK808
-	tristate "Clock driver for RK805/RK808/RK818"
+	tristate "Clock driver for RK805/RK808/RK809/RK817/RK818"
 	depends on MFD_RK808
 	---help---
-	  This driver supports RK805, RK808 and RK818 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.
+	  This driver supports RK805, RK809 and RK817, RK808 and RK818 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_HI655X
 	tristate "Clock driver for Hi655x" if EXPERT

drivers/clk/clk-rk808.c

@@ -96,6 +96,68 @@ of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
 	return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
 }
 
+static int rk817_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, RK817_SYS_CFG(1),
+				  RK817_CLK32KOUT2_EN,
+				  enable ? RK817_CLK32KOUT2_EN : 0);
+}
+
+static int rk817_clkout2_prepare(struct clk_hw *hw)
+{
+	return rk817_clkout2_enable(hw, true);
+}
+
+static void rk817_clkout2_unprepare(struct clk_hw *hw)
+{
+	rk817_clkout2_enable(hw, false);
+}
+
+static int rk817_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;
+	unsigned int val;
+
+	int ret = regmap_read(rk808->regmap, RK817_SYS_CFG(1), &val);
+
+	if (ret < 0)
+		return 0;
+
+	return (val & RK817_CLK32KOUT2_EN) ? 1 : 0;
+}
+
+static const struct clk_ops rk817_clkout2_ops = {
+	.prepare = rk817_clkout2_prepare,
+	.unprepare = rk817_clkout2_unprepare,
+	.is_prepared = rk817_clkout2_is_prepared,
+	.recalc_rate = rk808_clkout_recalc_rate,
+};
+
+static const struct clk_ops *rkpmic_get_ops(long variant)
+{
+	switch (variant) {
+	case RK809_ID:
+	case RK817_ID:
+		return &rk817_clkout2_ops;
+	/*
+	 * For the default case, it match the following PMIC type.
+	 * RK805_ID
+	 * RK808_ID
+	 * RK818_ID
+	 */
+	default:
+		return &rk808_clkout2_ops;
+	}
+}
+
 static int rk808_clkout_probe(struct platform_device *pdev)
 {
 	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
@@ -127,7 +189,7 @@ static int rk808_clkout_probe(struct platform_device *pdev)
 		return ret;
 
 	init.name = "rk808-clkout2";
-	init.ops = &rk808_clkout2_ops;
+	init.ops = rkpmic_get_ops(rk808->variant);
 	rk808_clkout->clkout2_hw.init = &init;
 
 	/* optional override of the clockname */