[PATCH v4 4/7] phy: rockchip-samsung-dcphy: Name the transmitter helpers and ops

The block is a combo PHY: it exposes a transmitter and a receiver, and a
later change registers one struct phy for each. Prepare for that. Give
every helper that programs the master lanes a tx_ prefix, and move the
phy pointer and the lane count, which only the transmitter uses, into a
struct samsung_mipi_phy that the receiver can have one of too.

Name the phy_ops and its callbacks after the transmitter as well, so
that the receiver can bring its own rather than share these.

The BIAS block and the PLL keep their names: the TRM puts both in the
part common to the whole block [1], so neither belongs to one PHY even
though only the transmitter drives the PLL.

No functional change intended.

[1] RK3588 TRM: sections 22.3.1 (bias generator), 22.3.2 (PLL) and
    22.4.1 (address map)

Assisted-by: Claude:claude-fable-5
Signed-off-by: Jason Yang <[email protected]>
---
 drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c | 67 ++++++++++++-----------
 1 file changed, 36 insertions(+), 31 deletions(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c b/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c
index 459ce882b369..f58907dec733 100644
--- a/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c
+++ b/drivers/phy/rockchip/phy-rockchip-samsung-dcphy.c
@@ -280,6 +280,11 @@ struct samsung_mipi_dcphy_plat_data {
 	u32 dphy_tx_max_lane_kbps;
 };
 
+struct samsung_mipi_phy {
+	struct phy *phy;
+	unsigned int lanes;
+};
+
 struct samsung_mipi_dcphy {
 	struct device *dev;
 	struct clk *ref_clk;
@@ -290,8 +295,7 @@ struct samsung_mipi_dcphy {
 	struct reset_control *s_phy_rst;
 	struct reset_control *apb_rst;
 	struct reset_control *grf_apb_rst;
-	unsigned int lanes;
-	struct phy *phy;
+	struct samsung_mipi_phy tx;
 	u8 type;
 
 	const struct samsung_mipi_dcphy_plat_data *pdata;
@@ -982,13 +986,13 @@ static void samsung_mipi_dcphy_bias_block_enable(struct samsung_mipi_dcphy *sams
 						 REG_400M_400MV | REG_645M_645MV);
 }
 
-static void samsung_mipi_dphy_lane_enable(struct samsung_mipi_dcphy *samsung)
+static void samsung_mipi_dphy_tx_lane_enable(struct samsung_mipi_dcphy *samsung)
 {
 	regmap_write(samsung->regmap, DPHY_MC_GNR_CON1, T_PHY_READY(0x2000));
 	regmap_update_bits(samsung->regmap, DPHY_MC_GNR_CON0,
 			   PHY_ENABLE, PHY_ENABLE);
 
-	switch (samsung->lanes) {
+	switch (samsung->tx.lanes) {
 	case 4:
 		regmap_write(samsung->regmap, DPHY_MD3_GNR_CON1,
 			     T_PHY_READY(0x2000));
@@ -1017,9 +1021,9 @@ static void samsung_mipi_dphy_lane_enable(struct samsung_mipi_dcphy *samsung)
 	}
 }
 
-static void samsung_mipi_dphy_lane_disable(struct samsung_mipi_dcphy *samsung)
+static void samsung_mipi_dphy_tx_lane_disable(struct samsung_mipi_dcphy *samsung)
 {
-	switch (samsung->lanes) {
+	switch (samsung->tx.lanes) {
 	case 4:
 		regmap_update_bits(samsung->regmap, DPHY_MD3_GNR_CON0,
 				   PHY_ENABLE, 0);
@@ -1094,7 +1098,7 @@ static void samsung_mipi_dcphy_pll_disable(struct samsung_mipi_dcphy *samsung)
 }
 
 static const struct samsung_mipi_dphy_timing *
-samsung_mipi_dphy_get_timing(struct samsung_mipi_dcphy *samsung)
+samsung_mipi_dphy_tx_get_timing(struct samsung_mipi_dcphy *samsung)
 {
 	const struct samsung_mipi_dphy_timing *timings;
 	unsigned int num_timings;
@@ -1201,13 +1205,13 @@ samsung_mipi_dcphy_pll_round_rate(struct samsung_mipi_dcphy *samsung,
 }
 
 static void
-samsung_mipi_dphy_clk_lane_timing_init(struct samsung_mipi_dcphy *samsung)
+samsung_mipi_dphy_tx_clk_lane_timing_init(struct samsung_mipi_dcphy *samsung)
 {
 	const struct samsung_mipi_dphy_timing *timing;
 	unsigned int lane_hs_rate = div64_ul(samsung->pll.rate, USEC_PER_SEC);
 	u32 val, res_up, res_down;
 
-	timing = samsung_mipi_dphy_get_timing(samsung);
+	timing = samsung_mipi_dphy_tx_get_timing(samsung);
 	regmap_write(samsung->regmap, DPHY_MC_GNR_CON0, 0xf000);
 
 	/*
@@ -1256,13 +1260,13 @@ samsung_mipi_dphy_clk_lane_timing_init(struct samsung_mipi_dcphy *samsung)
 }
 
 static void
-samsung_mipi_dphy_data_lane_timing_init(struct samsung_mipi_dcphy *samsung)
+samsung_mipi_dphy_tx_data_lane_timing_init(struct samsung_mipi_dcphy *samsung)
 {
 	const struct samsung_mipi_dphy_timing *timing;
 	unsigned int lane_hs_rate = div64_ul(samsung->pll.rate, USEC_PER_SEC);
 	u32 val, res_up, res_down;
 
-	timing = samsung_mipi_dphy_get_timing(samsung);
+	timing = samsung_mipi_dphy_tx_get_timing(samsung);
 
 	/*
 	 * The Drive-Strength / Voltage-Amplitude is adjusted by adjusting the
@@ -1325,7 +1329,7 @@ samsung_mipi_dphy_data_lane_timing_init(struct samsung_mipi_dcphy *samsung)
 	regmap_write(samsung->regmap, DPHY_MD3_TIME_CON4, 0x1f4);
 }
 
-static int samsung_mipi_dphy_power_on(struct samsung_mipi_dcphy *samsung)
+static int samsung_mipi_dphy_tx_power_on(struct samsung_mipi_dcphy *samsung)
 {
 	int ret;
 
@@ -1339,13 +1343,13 @@ static int samsung_mipi_dphy_power_on(struct samsung_mipi_dcphy *samsung)
 			   I_MUX_SEL_MASK, I_MUX_400MV);
 
 	samsung_mipi_dcphy_pll_configure(samsung);
-	samsung_mipi_dphy_clk_lane_timing_init(samsung);
-	samsung_mipi_dphy_data_lane_timing_init(samsung);
+	samsung_mipi_dphy_tx_clk_lane_timing_init(samsung);
+	samsung_mipi_dphy_tx_data_lane_timing_init(samsung);
 	ret = samsung_mipi_dcphy_pll_enable(samsung);
 	if (ret < 0)
 		return ret;
 
-	samsung_mipi_dphy_lane_enable(samsung);
+	samsung_mipi_dphy_tx_lane_enable(samsung);
 
 	reset_control_deassert(samsung->m_phy_rst);
 
@@ -1357,13 +1361,13 @@ static int samsung_mipi_dphy_power_on(struct samsung_mipi_dcphy *samsung)
 	return 0;
 }
 
-static int samsung_mipi_dcphy_power_on(struct phy *phy)
+static int samsung_mipi_dcphy_tx_power_on(struct phy *phy)
 {
 	struct samsung_mipi_dcphy *samsung = phy_get_drvdata(phy);
 
 	switch (samsung->type) {
 	case PHY_TYPE_DPHY:
-		return samsung_mipi_dphy_power_on(samsung);
+		return samsung_mipi_dphy_tx_power_on(samsung);
 	default:
 		/* CPHY part to be implemented later */
 		return -EOPNOTSUPP;
@@ -1372,13 +1376,13 @@ static int samsung_mipi_dcphy_power_on(struct phy *phy)
 	return 0;
 }
 
-static int samsung_mipi_dcphy_power_off(struct phy *phy)
+static int samsung_mipi_dcphy_tx_power_off(struct phy *phy)
 {
 	struct samsung_mipi_dcphy *samsung = phy_get_drvdata(phy);
 
 	switch (samsung->type) {
 	case PHY_TYPE_DPHY:
-		samsung_mipi_dphy_lane_disable(samsung);
+		samsung_mipi_dphy_tx_lane_disable(samsung);
 		break;
 	default:
 		/* CPHY part to be implemented later */
@@ -1477,13 +1481,13 @@ samsung_mipi_dcphy_pll_calc_rate(struct samsung_mipi_dcphy *samsung,
 	}
 }
 
-static int samsung_mipi_dcphy_configure(struct phy *phy,
-					union phy_configure_opts *opts)
+static int samsung_mipi_dcphy_tx_configure(struct phy *phy,
+					   union phy_configure_opts *opts)
 {
 	struct samsung_mipi_dcphy *samsung = phy_get_drvdata(phy);
 	unsigned long long target_rate = opts->mipi_dphy.hs_clk_rate;
 
-	samsung->lanes = opts->mipi_dphy.lanes > 4 ? 4 : opts->mipi_dphy.lanes;
+	samsung->tx.lanes = opts->mipi_dphy.lanes > 4 ? 4 : opts->mipi_dphy.lanes;
 
 	samsung_mipi_dcphy_pll_calc_rate(samsung, target_rate);
 	opts->mipi_dphy.hs_clk_rate = samsung->pll.rate;
@@ -1507,10 +1511,10 @@ static int samsung_mipi_dcphy_exit(struct phy *phy)
 	return 0;
 }
 
-static const struct phy_ops samsung_mipi_dcphy_ops = {
-	.configure = samsung_mipi_dcphy_configure,
-	.power_on  = samsung_mipi_dcphy_power_on,
-	.power_off = samsung_mipi_dcphy_power_off,
+static const struct phy_ops samsung_mipi_dcphy_tx_ops = {
+	.configure = samsung_mipi_dcphy_tx_configure,
+	.power_on  = samsung_mipi_dcphy_tx_power_on,
+	.power_off = samsung_mipi_dcphy_tx_power_off,
 	.init = samsung_mipi_dcphy_init,
 	.exit = samsung_mipi_dcphy_exit,
 	.owner	   = THIS_MODULE,
@@ -1540,7 +1544,7 @@ static struct phy *samsung_mipi_dcphy_xlate(struct device *dev,
 
 	samsung->type = args->args[0];
 
-	return samsung->phy;
+	return samsung->tx.phy;
 }
 
 static int samsung_mipi_dcphy_probe(struct platform_device *pdev)
@@ -1609,11 +1613,12 @@ static int samsung_mipi_dcphy_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret, "Failed to enable runtime PM\n");
 
-	samsung->phy = devm_phy_create(dev, NULL, &samsung_mipi_dcphy_ops);
-	if (IS_ERR(samsung->phy))
-		return dev_err_probe(dev, PTR_ERR(samsung->phy), "Failed to create MIPI DC-PHY\n");
+	samsung->tx.phy = devm_phy_create(dev, NULL, &samsung_mipi_dcphy_tx_ops);
+	if (IS_ERR(samsung->tx.phy))
+		return dev_err_probe(dev, PTR_ERR(samsung->tx.phy),
+				     "Failed to create MIPI DC-PHY transmitter\n");
 
-	phy_set_drvdata(samsung->phy, samsung);
+	phy_set_drvdata(samsung->tx.phy, samsung);
 
 	phy_provider = devm_of_phy_provider_register(dev, samsung_mipi_dcphy_xlate);
 	if (IS_ERR(phy_provider))

-- 
2.43.0