linux-kernel - [PATCH 5/5] clk: RK808: add clkout driver for RK809 and RK817.

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Date:   Mon, 23 Jul 2018 16:40:33 +0800
From:   Tony Xie <tony.xie@...k-chips.com>
To:     heiko@...ech.de
Cc:     broonie@...nel.org, lee.jones@...aro.org, a.zummo@...ertech.it,
        alexandre.belloni@...tlin.com, sboyd@...nel.org,
        linux-clk@...r.kernel.org, linux-rtc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, chenjh@...k-chips.com,
        xsf@...k-chips.com, zhangqing@...k-chips.com,
        huangtao@...k-chips.com, tony.xie@...k-chips.com
Subject: [PATCH 5/5] clk: RK808: add clkout driver for RK809 and RK817.

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@...k-chips.com>
---
 drivers/clk/Kconfig     |  6 ++---
 drivers/clk/clk-rk808.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 64 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 721572a..fc1427c 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -46,11 +46,11 @@ config COMMON_CLK_MAX77686
 	  clock.
 
 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,
+	  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.
 
diff --git a/drivers/clk/clk-rk808.c b/drivers/clk/clk-rk808.c
index 6461f28..c5d3492 100644
--- a/drivers/clk/clk-rk808.c
+++ b/drivers/clk/clk-rk808.c
@@ -96,6 +96,66 @@ static int rk808_clkout2_is_prepared(struct clk_hw *hw)
 	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 ret;
+
+	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;
+	case RK805_ID:
+	case RK808_ID:
+	case RK818_ID:
+		return &rk808_clkout2_ops;
+	}
+
+	return &rk808_clkout2_ops;
+}
+
 static int rk808_clkout_probe(struct platform_device *pdev)
 {
 	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
@@ -127,7 +187,7 @@ 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 */
-- 
1.9.1