From: Daniel Mack Date: Tue, 25 Jan 2022 09:33:36 +0000 (+0100) Subject: clk: cs2000-cp: convert driver to regmap X-Git-Tag: v6.6.17~7797^2~5^4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5edffb980519c3d59f93fdaff7249af83c3a3495;p=platform%2Fkernel%2Flinux-rpi.git clk: cs2000-cp: convert driver to regmap Regmap gives us caching, debugging infrastructure and other things for free and does away with open-coded bit-fiddling implementations. Signed-off-by: Daniel Mack Link: https://lore.kernel.org/r/20220125093336.226787-10-daniel@zonque.org Signed-off-by: Stephen Boyd --- diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index ad4256d..87ff6e2 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -197,6 +197,7 @@ config COMMON_CLK_CDCE925 config COMMON_CLK_CS2000_CP tristate "Clock driver for CS2000 Fractional-N Clock Synthesizer & Clock Multiplier" depends on I2C + select REGMAP_I2C help If you say yes here you get support for the CS2000 clock multiplier. diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c index 1baf059..dc5040a 100644 --- a/drivers/clk/clk-cs2000-cp.c +++ b/drivers/clk/clk-cs2000-cp.c @@ -11,6 +11,7 @@ #include #include #include +#include #define CH_MAX 4 #define RATIO_REG_SIZE 4 @@ -74,11 +75,36 @@ #define REF_CLK 1 #define CLK_MAX 2 +static bool cs2000_readable_reg(struct device *dev, unsigned int reg) +{ + return reg > 0; +} + +static bool cs2000_writeable_reg(struct device *dev, unsigned int reg) +{ + return reg != DEVICE_ID; +} + +static bool cs2000_volatile_reg(struct device *dev, unsigned int reg) +{ + return reg == DEVICE_CTRL; +} + +static const struct regmap_config cs2000_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = FUNC_CFG2, + .readable_reg = cs2000_readable_reg, + .writeable_reg = cs2000_writeable_reg, + .volatile_reg = cs2000_volatile_reg, +}; + struct cs2000_priv { struct clk_hw hw; struct i2c_client *client; struct clk *clk_in; struct clk *ref_clk; + struct regmap *regmap; bool dynamic_mode; bool lf_ratio; @@ -101,41 +127,22 @@ static const struct i2c_device_id cs2000_id[] = { }; MODULE_DEVICE_TABLE(i2c, cs2000_id); -#define cs2000_read(priv, addr) \ - i2c_smbus_read_byte_data(priv_to_client(priv), addr) -#define cs2000_write(priv, addr, val) \ - i2c_smbus_write_byte_data(priv_to_client(priv), addr, val) - -static int cs2000_bset(struct cs2000_priv *priv, u8 addr, u8 mask, u8 val) -{ - s32 data; - - data = cs2000_read(priv, addr); - if (data < 0) - return data; - - data &= ~mask; - data |= (val & mask); - - return cs2000_write(priv, addr, data); -} - static int cs2000_enable_dev_config(struct cs2000_priv *priv, bool enable) { int ret; - ret = cs2000_bset(priv, DEVICE_CFG1, ENDEV1, - enable ? ENDEV1 : 0); + ret = regmap_update_bits(priv->regmap, DEVICE_CFG1, ENDEV1, + enable ? ENDEV1 : 0); if (ret < 0) return ret; - ret = cs2000_bset(priv, GLOBAL_CFG, ENDEV2, - enable ? ENDEV2 : 0); + ret = regmap_update_bits(priv->regmap, GLOBAL_CFG, ENDEV2, + enable ? ENDEV2 : 0); if (ret < 0) return ret; - ret = cs2000_bset(priv, FUNC_CFG1, CLKSKIPEN, - (enable && priv->clk_skip) ? CLKSKIPEN : 0); + ret = regmap_update_bits(priv->regmap, FUNC_CFG1, CLKSKIPEN, + (enable && priv->clk_skip) ? CLKSKIPEN : 0); if (ret < 0) return ret; @@ -156,21 +163,21 @@ static int cs2000_ref_clk_bound_rate(struct cs2000_priv *priv, else return -EINVAL; - return cs2000_bset(priv, FUNC_CFG1, - REFCLKDIV_MASK, - REFCLKDIV(val)); + return regmap_update_bits(priv->regmap, FUNC_CFG1, + REFCLKDIV_MASK, + REFCLKDIV(val)); } static int cs2000_wait_pll_lock(struct cs2000_priv *priv) { struct device *dev = priv_to_dev(priv); - s32 val; - unsigned int i; + unsigned int i, val; + int ret; for (i = 0; i < 256; i++) { - val = cs2000_read(priv, DEVICE_CTRL); - if (val < 0) - return val; + ret = regmap_read(priv->regmap, DEVICE_CTRL, &val); + if (ret < 0) + return ret; if (!(val & PLL_UNLOCK)) return 0; udelay(1); @@ -184,10 +191,10 @@ static int cs2000_wait_pll_lock(struct cs2000_priv *priv) static int cs2000_clk_out_enable(struct cs2000_priv *priv, bool enable) { /* enable both AUX_OUT, CLK_OUT */ - return cs2000_bset(priv, DEVICE_CTRL, - (AUXOUTDIS | CLKOUTDIS), - enable ? 0 : - (AUXOUTDIS | CLKOUTDIS)); + return regmap_update_bits(priv->regmap, DEVICE_CTRL, + (AUXOUTDIS | CLKOUTDIS), + enable ? 0 : + (AUXOUTDIS | CLKOUTDIS)); } static u32 cs2000_rate_to_ratio(u32 rate_in, u32 rate_out, bool lf_ratio) @@ -235,7 +242,7 @@ static int cs2000_ratio_set(struct cs2000_priv *priv, val = cs2000_rate_to_ratio(rate_in, rate_out, priv->lf_ratio); for (i = 0; i < RATIO_REG_SIZE; i++) { - ret = cs2000_write(priv, + ret = regmap_write(priv->regmap, Ratio_Add(ch, i), Ratio_Val(val, i)); if (ret < 0) @@ -247,14 +254,14 @@ static int cs2000_ratio_set(struct cs2000_priv *priv, static u32 cs2000_ratio_get(struct cs2000_priv *priv, int ch) { - s32 tmp; + unsigned int tmp, i; u32 val; - unsigned int i; + int ret; val = 0; for (i = 0; i < RATIO_REG_SIZE; i++) { - tmp = cs2000_read(priv, Ratio_Add(ch, i)); - if (tmp < 0) + ret = regmap_read(priv->regmap, Ratio_Add(ch, i), &tmp); + if (ret < 0) return 0; val |= Val_Ratio(tmp, i); @@ -271,15 +278,15 @@ static int cs2000_ratio_select(struct cs2000_priv *priv, int ch) if (CH_SIZE_ERR(ch)) return -EINVAL; - ret = cs2000_bset(priv, DEVICE_CFG1, RSEL_MASK, RSEL(ch)); + ret = regmap_update_bits(priv->regmap, DEVICE_CFG1, RSEL_MASK, RSEL(ch)); if (ret < 0) return ret; fracnsrc = priv->dynamic_mode ? FRACNSRC_DYNAMIC : FRACNSRC_STATIC; - ret = cs2000_bset(priv, DEVICE_CFG2, - AUTORMOD | LOCKCLK_MASK | FRACNSRC_MASK, - LOCKCLK(ch) | fracnsrc); + ret = regmap_update_bits(priv->regmap, DEVICE_CFG2, + AUTORMOD | LOCKCLK_MASK | FRACNSRC_MASK, + LOCKCLK(ch) | fracnsrc); if (ret < 0) return ret; @@ -326,8 +333,8 @@ static int cs2000_select_ratio_mode(struct cs2000_priv *priv, */ priv->lf_ratio = priv->dynamic_mode && ((rate / parent_rate) > 4096); - return cs2000_bset(priv, FUNC_CFG2, LFRATIO_MASK, - priv->lf_ratio ? LFRATIO_20_12 : LFRATIO_12_20); + return regmap_update_bits(priv->regmap, FUNC_CFG2, LFRATIO_MASK, + priv->lf_ratio ? LFRATIO_20_12 : LFRATIO_12_20); } static int __cs2000_set_rate(struct cs2000_priv *priv, int ch, @@ -336,7 +343,7 @@ static int __cs2000_set_rate(struct cs2000_priv *priv, int ch, { int ret; - ret = cs2000_bset(priv, GLOBAL_CFG, FREEZE, FREEZE); + ret = regmap_update_bits(priv->regmap, GLOBAL_CFG, FREEZE, FREEZE); if (ret < 0) return ret; @@ -352,7 +359,7 @@ static int __cs2000_set_rate(struct cs2000_priv *priv, int ch, if (ret < 0) return ret; - ret = cs2000_bset(priv, GLOBAL_CFG, FREEZE, 0); + ret = regmap_update_bits(priv->regmap, GLOBAL_CFG, FREEZE, 0); if (ret < 0) return ret; @@ -469,8 +476,8 @@ static int cs2000_clk_register(struct cs2000_priv *priv) priv->dynamic_mode ? "dynamic" : "static"); of_property_read_u32(np, "cirrus,aux-output-source", &aux_out); - ret = cs2000_bset(priv, DEVICE_CFG1, - AUXOUTSRC_MASK, AUXOUTSRC(aux_out)); + ret = regmap_update_bits(priv->regmap, DEVICE_CFG1, + AUXOUTSRC_MASK, AUXOUTSRC(aux_out)); if (ret < 0) return ret; @@ -522,12 +529,13 @@ static int cs2000_clk_register(struct cs2000_priv *priv) static int cs2000_version_print(struct cs2000_priv *priv) { struct device *dev = priv_to_dev(priv); - s32 val; const char *revision; + unsigned int val; + int ret; - val = cs2000_read(priv, DEVICE_ID); - if (val < 0) - return val; + ret = regmap_read(priv->regmap, DEVICE_ID, &val); + if (ret < 0) + return ret; /* CS2000 should be 0x0 */ if (val >> 3) @@ -576,6 +584,10 @@ static int cs2000_probe(struct i2c_client *client, priv->client = client; i2c_set_clientdata(client, priv); + priv->regmap = devm_regmap_init_i2c(client, &cs2000_regmap_config); + if (IS_ERR(priv->regmap)) + return PTR_ERR(priv->regmap); + ret = cs2000_clk_get(priv); if (ret < 0) return ret;