phy: cadence-torrent: Add enum for supported input reference clock frequencies

Torrent PHY supports different input reference clock frequencies.
Register configurations will be different based on reference clock value.
Prepare driver to support such multiple reference clock frequencies.
Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Reviewed-by: Kishon Vijay Abraham I <kishon@ti.com>
Link: https://lore.kernel.org/r/20210728145454.15945-4-sjakhade@cadence.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/cadence/phy-cadence-torrent.c

@@ -26,11 +26,13 @@
 
 #define REF_CLK_19_2MHZ		19200000
 #define REF_CLK_25MHZ		25000000
+#define REF_CLK_100MHZ		100000000
 
 #define MAX_NUM_LANES		4
 #define DEFAULT_MAX_BIT_RATE	8100 /* in Mbps */
 
 #define NUM_SSC_MODE		3
+#define NUM_REF_CLK		3
 #define NUM_PHY_TYPE		6
 
 #define POLL_TIMEOUT_US		5000
@@ -273,6 +275,12 @@ enum cdns_torrent_phy_type {
 	TYPE_USB,
 };
 
+enum cdns_torrent_ref_clk {
+	CLK_19_2_MHZ,
+	CLK_25_MHZ,
+	CLK_100_MHZ
+};
+
 enum cdns_torrent_ssc_mode {
 	NO_SSC,
 	EXTERNAL_SSC,
@@ -296,7 +304,7 @@ struct cdns_torrent_phy {
 	struct reset_control *apb_rst;
 	struct device *dev;
 	struct clk *clk;
-	unsigned long ref_clk_rate;
+	enum cdns_torrent_ref_clk ref_clk_rate;
 	struct cdns_torrent_inst phys[MAX_NUM_LANES];
 	int nsubnodes;
 	const struct cdns_torrent_data *init_data;
@@ -960,10 +968,10 @@ static void cdns_torrent_dp_pma_lane_cfg(struct cdns_torrent_phy *cdns_phy,
 					 unsigned int lane)
 {
 	/* Per lane, refclock-dependent receiver detection setting */
-	if (cdns_phy->ref_clk_rate == REF_CLK_19_2MHZ)
+	if (cdns_phy->ref_clk_rate == CLK_19_2_MHZ)
 		cdns_torrent_phy_write(cdns_phy->regmap_tx_lane_cdb[lane],
 				       TX_RCVDET_ST_TMR, 0x0780);
-	else if (cdns_phy->ref_clk_rate == REF_CLK_25MHZ)
+	else if (cdns_phy->ref_clk_rate == CLK_25_MHZ)
 		cdns_torrent_phy_write(cdns_phy->regmap_tx_lane_cdb[lane],
 				       TX_RCVDET_ST_TMR, 0x09C4);
 
@@ -1004,10 +1012,10 @@ static void cdns_torrent_dp_pma_cfg(struct cdns_torrent_phy *cdns_phy,
 {
 	unsigned int i;
 
-	if (cdns_phy->ref_clk_rate == REF_CLK_19_2MHZ)
+	if (cdns_phy->ref_clk_rate == CLK_19_2_MHZ)
 		/* PMA common configuration 19.2MHz */
 		cdns_torrent_dp_pma_cmn_cfg_19_2mhz(cdns_phy);
-	else if (cdns_phy->ref_clk_rate == REF_CLK_25MHZ)
+	else if (cdns_phy->ref_clk_rate == CLK_25_MHZ)
 		/* PMA common configuration 25MHz */
 		cdns_torrent_dp_pma_cmn_cfg_25mhz(cdns_phy);
 
@@ -1254,12 +1262,12 @@ static int cdns_torrent_dp_configure_rate(struct cdns_torrent_phy *cdns_phy,
 	ndelay(200);
 
 	/* DP Rate Change - VCO Output settings. */
-	if (cdns_phy->ref_clk_rate == REF_CLK_19_2MHZ) {
+	if (cdns_phy->ref_clk_rate == CLK_19_2_MHZ) {
 		/* PMA common configuration 19.2MHz */
 		cdns_torrent_dp_pma_cmn_vco_cfg_19_2mhz(cdns_phy, dp->link_rate,
 							dp->ssc);
 		cdns_torrent_dp_pma_cmn_cfg_19_2mhz(cdns_phy);
-	} else if (cdns_phy->ref_clk_rate == REF_CLK_25MHZ) {
+	} else if (cdns_phy->ref_clk_rate == CLK_25_MHZ) {
 		/* PMA common configuration 25MHz */
 		cdns_torrent_dp_pma_cmn_vco_cfg_25mhz(cdns_phy, dp->link_rate,
 						      dp->ssc);
@@ -1602,8 +1610,8 @@ static int cdns_torrent_dp_init(struct phy *phy)
 	struct regmap *regmap = cdns_phy->regmap_dptx_phy_reg;
 
 	switch (cdns_phy->ref_clk_rate) {
-	case REF_CLK_19_2MHZ:
-	case REF_CLK_25MHZ:
+	case CLK_19_2_MHZ:
+	case CLK_25_MHZ:
 		/* Valid Ref Clock Rate */
 		break;
 	default:
@@ -1635,11 +1643,11 @@ static int cdns_torrent_dp_init(struct phy *phy)
 
 	/* PHY PMA registers configuration functions */
 	/* Initialize PHY with max supported link rate, without SSC. */
-	if (cdns_phy->ref_clk_rate == REF_CLK_19_2MHZ)
+	if (cdns_phy->ref_clk_rate == CLK_19_2_MHZ)
 		cdns_torrent_dp_pma_cmn_vco_cfg_19_2mhz(cdns_phy,
 							cdns_phy->max_bit_rate,
 							false);
-	else if (cdns_phy->ref_clk_rate == REF_CLK_25MHZ)
+	else if (cdns_phy->ref_clk_rate == CLK_25_MHZ)
 		cdns_torrent_dp_pma_cmn_vco_cfg_25mhz(cdns_phy,
 						      cdns_phy->max_bit_rate,
 						      false);
@@ -2255,6 +2263,7 @@ static int cdns_torrent_reset(struct cdns_torrent_phy *cdns_phy)
 static int cdns_torrent_clk(struct cdns_torrent_phy *cdns_phy)
 {
 	struct device *dev = cdns_phy->dev;
+	unsigned long ref_clk_rate;
 	int ret;
 
 	cdns_phy->clk = devm_clk_get(dev, "refclk");
@@ -2269,13 +2278,29 @@ static int cdns_torrent_clk(struct cdns_torrent_phy *cdns_phy)
 		return ret;
 	}
 
-	cdns_phy->ref_clk_rate = clk_get_rate(cdns_phy->clk);
-	if (!(cdns_phy->ref_clk_rate)) {
+	ref_clk_rate = clk_get_rate(cdns_phy->clk);
+	if (!ref_clk_rate) {
 		dev_err(cdns_phy->dev, "Failed to get ref clock rate\n");
 		clk_disable_unprepare(cdns_phy->clk);
 		return -EINVAL;
 	}
 
+	switch (ref_clk_rate) {
+	case REF_CLK_19_2MHZ:
+		cdns_phy->ref_clk_rate = CLK_19_2_MHZ;
+		break;
+	case REF_CLK_25MHZ:
+		cdns_phy->ref_clk_rate = CLK_25_MHZ;
+		break;
+	case REF_CLK_100MHZ:
+		cdns_phy->ref_clk_rate = CLK_100_MHZ;
+		break;
+	default:
+		dev_err(cdns_phy->dev, "Invalid Ref Clock Rate\n");
+		clk_disable_unprepare(cdns_phy->clk);
+		return -EINVAL;
+	}
+
 	return 0;
 }