Linux-PHY Archive on lore.kernel.org

* [PATCH v4 phy-next 09/16] phy: lynx-28g: make lynx_28g_pll_read_configuration() callable per PLL
From: Vladimir Oltean @ 2026-06-08 22:17 UTC (permalink / raw)
  To: linux-phy
  Cc: Ioana Ciornei, Vinod Koul, Neil Armstrong, Tanjeff Moos,
	linux-kernel
In-Reply-To: <20260608221710.1572971-1-vladimir.oltean@nxp.com>

In a future change, lynx_28g_pll_read_configuration() and
lynx_28g_lane_read_configuration() will be made methods of struct
lynx_info.

There is no functional reason, but lynx_28g_lane_read_configuration() is
called per lane and lynx_28g_pll_read_configuration() iterates over PLLs
internally. So the API exported by the lynx_info structure would not be
uniform. Change lynx_28g_pll_read_configuration() to also permit reading
the PLL configuration individually, and move the for loop at the call
site.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
v2->v4: none
v1->v2: fix typo in commit message (spotted by Sashiko)
---
 drivers/phy/freescale/phy-fsl-lynx-28g.c | 73 ++++++++++++------------
 1 file changed, 35 insertions(+), 38 deletions(-)

diff --git a/drivers/phy/freescale/phy-fsl-lynx-28g.c b/drivers/phy/freescale/phy-fsl-lynx-28g.c
index a3fbd31d4dbf..dbbadaa08cb6 100644
--- a/drivers/phy/freescale/phy-fsl-lynx-28g.c
+++ b/drivers/phy/freescale/phy-fsl-lynx-28g.c
@@ -272,7 +272,6 @@
 #define lynx_28g_lane_rmw			lynx_lane_rmw
 #define lynx_28g_lane_read			lynx_lane_read
 #define lynx_28g_lane_write			lynx_lane_write
-#define lynx_28g_pll_read			lynx_pll_read
 
 #define lynx_28g_priv				lynx_priv
 #define lynx_28g_lane				lynx_lane
@@ -1051,49 +1050,41 @@ static const struct phy_ops lynx_28g_ops = {
 	.owner		= THIS_MODULE,
 };
 
-static void lynx_28g_pll_read_configuration(struct lynx_28g_priv *priv)
+static void lynx_28g_pll_read_configuration(struct lynx_pll *pll)
 {
-	struct lynx_28g_pll *pll;
 	u32 val;
-	int i;
 
-	for (i = 0; i < LYNX_28G_NUM_PLL; i++) {
-		pll = &priv->pll[i];
-		pll->priv = priv;
-		pll->id = i;
+	val = lynx_pll_read(pll, PLLnRSTCTL);
+	pll->enabled = !(val & PLLnRSTCTL_DIS);
+	pll->locked = !!(val & PLLnRSTCTL_LOCK);
 
-		val = lynx_28g_pll_read(pll, PLLnRSTCTL);
-		pll->enabled = !(val & PLLnRSTCTL_DIS);
-		pll->locked = !!(val & PLLnRSTCTL_LOCK);
+	val = lynx_pll_read(pll, PLLnCR0);
+	pll->refclk_sel = FIELD_GET(PLLnCR0_REFCLK_SEL, val);
 
-		val = lynx_28g_pll_read(pll, PLLnCR0);
-		pll->refclk_sel = FIELD_GET(PLLnCR0_REFCLK_SEL, val);
+	val = lynx_pll_read(pll, PLLnCR1);
+	pll->frate_sel = FIELD_GET(PLLnCR1_FRATE_SEL, val);
 
-		val = lynx_28g_pll_read(pll, PLLnCR1);
-		pll->frate_sel = FIELD_GET(PLLnCR1_FRATE_SEL, val);
-
-		if (!pll->enabled)
-			continue;
+	if (!pll->enabled)
+		return;
 
-		switch (pll->frate_sel) {
-		case PLLnCR1_FRATE_5G_10GVCO:
-		case PLLnCR1_FRATE_5G_25GVCO:
-			/* 5GHz clock net */
-			__set_bit(LANE_MODE_1000BASEX_SGMII, pll->supported);
-			break;
-		case PLLnCR1_FRATE_10G_20GVCO:
-			/* 10.3125GHz clock net */
-			__set_bit(LANE_MODE_10GBASER, pll->supported);
-			__set_bit(LANE_MODE_USXGMII, pll->supported);
-			break;
-		case PLLnCR1_FRATE_12G_25GVCO:
-			/* 12.890625GHz clock net */
-			__set_bit(LANE_MODE_25GBASER, pll->supported);
-			break;
-		default:
-			/* 6GHz, 8GHz */
-			break;
-		}
+	switch (pll->frate_sel) {
+	case PLLnCR1_FRATE_5G_10GVCO:
+	case PLLnCR1_FRATE_5G_25GVCO:
+		/* 5GHz clock net */
+		__set_bit(LANE_MODE_1000BASEX_SGMII, pll->supported);
+		break;
+	case PLLnCR1_FRATE_10G_20GVCO:
+		/* 10.3125GHz clock net */
+		__set_bit(LANE_MODE_10GBASER, pll->supported);
+		__set_bit(LANE_MODE_USXGMII, pll->supported);
+		break;
+	case PLLnCR1_FRATE_12G_25GVCO:
+		/* 12.890625GHz clock net */
+		__set_bit(LANE_MODE_25GBASER, pll->supported);
+		break;
+	default:
+		/* 6GHz, 8GHz */
+		break;
 	}
 }
 
@@ -1291,7 +1282,13 @@ static int lynx_28g_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
-	lynx_28g_pll_read_configuration(priv);
+	for (int i = 0; i < LYNX_28G_NUM_PLL; i++) {
+		struct lynx_28g_pll *pll = &priv->pll[i];
+
+		pll->priv = priv;
+		pll->id = i;
+		lynx_28g_pll_read_configuration(pll);
+	}
 
 	if (of_get_child_count(dn)) {
 		struct device_node *child;
-- 
2.34.1


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