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MPIO2 is a multi-function pin, with clkout being one of the functions and exclusively available on this pin. It supports prepare, unprepare and set rate (32k divide by powers of 2). Add clock-cells and clock-output-names properties so that other dt nodes can consume this clock. Signed-off-by: Josua Mayer --- Documentation/devicetree/bindings/regulator/renesas,raa215300.yaml | 6 +++= +++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/regulator/renesas,raa215300.= yaml b/Documentation/devicetree/bindings/regulator/renesas,raa215300.yaml index 97cff71d29677..b6b6b76b16d30 100644 --- a/Documentation/devicetree/bindings/regulator/renesas,raa215300.yaml +++ b/Documentation/devicetree/bindings/regulator/renesas,raa215300.yaml @@ -40,6 +40,12 @@ properties: interrupts: maxItems: 1 =20 + "#clock-cells": + const: 0 + + clock-output-names: + maxItems: 1 + clocks: description: | The clocks are optional. 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There are in total 6 configurable multi-purpose pins, however only one of them supports outputting a clock in one specific configuration. Register this clock with common clock framework, implementing prepare, unprepare and set_rate. Signed-off-by: Josua Mayer --- drivers/regulator/raa215300.c | 132 ++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 132 insertions(+) diff --git a/drivers/regulator/raa215300.c b/drivers/regulator/raa215300.c index 6982565c8aa4c..e66bd0404421b 100644 --- a/drivers/regulator/raa215300.c +++ b/drivers/regulator/raa215300.c @@ -27,6 +27,24 @@ #define RAA215300_INT_MASK_6 0x68 =20 #define RAA215300_REG_BLOCK_EN 0x6c +#define RAA215300_REG_MPIO2_POWER_OFF 0x77 +#define RAA215300_MPIO2_POWER_OFF_DELAY GENMASK(6, 0) +#define RAA215300_REG_MPIO2_CONFIG 0x8c +#define RAA215300_MPIO2_CONFIG_POLARITY_ACTIVE_HIGH BIT(5) +#define RAA215300_MPIO2_CONFIG_TYPE GENMASK(4, 3) +#define RAA215300_MPIO2_CONFIG_TYPE_HIGH_IMPEDANCE (0 << 3) +#define RAA215300_MPIO2_CONFIG_TYPE_OPEN_DRAIN (1 << 1) +#define RAA215300_MPIO2_CONFIG_TYPE_OPEN_SOURCE (2 << 2) +#define RAA215300_MPIO2_CONFIG_TYPE_CMOS (3 << 3) +#define RAA215300_MPIO2_CONFIG_FUNCTION GENMASK(2, 0) +#define RAA215300_MPIO2_CONFIG_FUNCTION_NONE 0 +#define RAA215300_MPIO2_CONFIG_FUNCTION_CLKOUT 1 +#define RAA215300_MPIO2_CONFIG_FUNCTION_EXT_VR_PGOOD 2 +#define RAA215300_MPIO2_CONFIG_FUNCTION_GPI 3 +#define RAA215300_MPIO2_CONFIG_FUNCTION_GPI_PGOOD 4 +#define RAA215300_MPIO2_CONFIG_FUNCTION_RESETOUT 5 +#define RAA215300_MPIO2_CONFIG_FUNCTION_EXT_VR_EN 6 +#define RAA215300_MPIO2_CONFIG_FUNCTION_GPO 7 #define RAA215300_HW_REV 0xf8 =20 #define RAA215300_INT_MASK_1_ALL GENMASK(5, 0) @@ -49,6 +67,117 @@ static void raa215300_rtc_unregister_device(void *data) i2c_unregister_device(data); } =20 +struct raa215300_clk { + struct clk_hw hw; + struct regmap *regmap; +}; + +#define to_raa215300_clk(_hw) container_of(_hw, struct raa215300_clk, hw) + +static int raa215300_clk_prepare(struct clk_hw *hw) +{ + struct raa215300_clk *clk =3D to_raa215300_clk(hw); + /* clkout function must configure mpio2 as full cmos output */ + const u8 ena_val =3D RAA215300_MPIO2_CONFIG_TYPE_CMOS | + RAA215300_MPIO2_CONFIG_FUNCTION_CLKOUT; + + return regmap_write(clk->regmap, RAA215300_REG_MPIO2_CONFIG, ena_val); +} + +static void raa215300_clk_unprepare(struct clk_hw *hw) +{ + struct raa215300_clk *clk =3D to_raa215300_clk(hw); + const u8 dis_val =3D RAA215300_MPIO2_CONFIG_TYPE_HIGH_IMPEDANCE | + RAA215300_MPIO2_CONFIG_FUNCTION_NONE; + + regmap_write(clk->regmap, RAA215300_REG_MPIO2_CONFIG, dis_val); +} + +static unsigned long raa215300_clk_recalc_rate(struct clk_hw *hw, unsigned= long parent_rate) +{ + struct raa215300_clk *clk =3D to_raa215300_clk(hw); + unsigned int val; + + regmap_read(clk->regmap, RAA215300_REG_MPIO2_POWER_OFF, &val); + val &=3D RAA215300_MPIO2_POWER_OFF_DELAY; + + return 32768 >> val; +} + +static int raa215300_clk_determine_rate(struct clk_hw *hw, struct clk_rate= _request *req) +{ + unsigned long r =3D 32768; + + while (r > req->rate) + r >>=3D 1; + + /* clamp at minimum rate 256Hz */ + if (r < 256) + r =3D 256; + + req->rate =3D r; + return 0; +} + +static int raa215300_clk_set_rate(struct clk_hw *hw, unsigned long rate, u= nsigned long parent_rate) +{ + struct raa215300_clk *clk =3D to_raa215300_clk(hw); + unsigned int val =3D 0; + unsigned long r =3D 32768; + + while (r > rate) { + r >>=3D 1; + val++; + } + + /* clamp at minimum rate 256Hz */ + if (r < 256) { + r =3D 256; + val =3D 7; + } + + return regmap_update_bits(clk->regmap, RAA215300_REG_MPIO2_POWER_OFF, + RAA215300_MPIO2_POWER_OFF_DELAY, val); +} + +static const struct clk_ops raa215300_clk_ops =3D { + .prepare =3D raa215300_clk_prepare, + .unprepare =3D raa215300_clk_unprepare, + .recalc_rate =3D raa215300_clk_recalc_rate, + .determine_rate =3D raa215300_clk_determine_rate, + .set_rate =3D raa215300_clk_set_rate, +}; + +static int raa215300_register_clk(struct device *dev, struct regmap *regma= p) +{ + struct raa215300_clk *clk; + struct clk_init_data init; + int ret; + + clk =3D devm_kzalloc(dev, sizeof(*clk), GFP_KERNEL); + if (!clk) + return -ENOMEM; + + clk->hw.init =3D &init; + clk->regmap =3D regmap; + + init.name =3D "raa215300-clkout"; + init.ops =3D &raa215300_clk_ops; + init.flags =3D 0; + init.parent_names =3D NULL; + init.num_parents =3D 0; + + /* optional override of the clockname */ + of_property_read_string(dev->of_node, "clock-output-names", &init.name); + + /* register the clock */ + ret =3D devm_clk_hw_register(dev, &clk->hw); + if (ret) + return ret; + + return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &clk->hw); +} + static int raa215300_clk_present(struct i2c_client *client, const char *na= me) { struct clk *clk; @@ -166,6 +295,9 @@ static int raa215300_i2c_probe(struct i2c_client *clien= t) rtc_client); if (ret < 0) return ret; + + /* register mpio2 32k clkout in common clk framework */ + raa215300_register_clk(dev, regmap); } =20 return 0; --=20 2.51.0