Add bridged amplifiers to cs42l43

Merge series from Charles Keepax <ckeepax@opensource.cirrus.com>:

In some cs42l43 systems a couple of cs35l56 amplifiers are attached
to the cs42l43's SPI and I2S. On Windows the cs42l43 is controlled
by a SDCA class driver and these two amplifiers are controlled by
firmware running on the cs42l43. However, under Linux the decision
was made to interact with the cs42l43 directly, affording the user
greater control over the audio system. However, this has resulted
in an issue where these two bridged cs35l56 amplifiers are not
populated in ACPI and must be added manually. There is at least an
SDCA extension unit DT entry we can key off.

The process of adding this is handled using a software node, firstly the
ability to add native chip selects to software nodes must be added.
Secondly, an additional flag for naming the SPI devices is added this
allows the machine driver to key to the correct amplifier. Then finally,
the cs42l43 SPI driver adds the two amplifiers directly onto its SPI
bus.

An additional series will follow soon to add the audio machine driver
parts (in the sof-sdw driver), however that is fairly orthogonal to
this part of the process, getting the actual amplifiers registered.

1 files changed, 24 insertions, 7 deletions

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 8b8634600c519..ddb50a0e2bc82 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -2431,6 +2431,7 @@ static int lan8814_hwtstamp(struct mii_timestamper *mii_ts,
 	struct lan8814_ptp_rx_ts *rx_ts, *tmp;
 	int txcfg = 0, rxcfg = 0;
 	int pkt_ts_enable;
+	int tx_mod;
 
 	ptp_priv->hwts_tx_type = config->tx_type;
 	ptp_priv->rx_filter = config->rx_filter;
@@ -2477,9 +2478,14 @@ static int lan8814_hwtstamp(struct mii_timestamper *mii_ts,
 	lanphy_write_page_reg(ptp_priv->phydev, 5, PTP_RX_TIMESTAMP_EN, pkt_ts_enable);
 	lanphy_write_page_reg(ptp_priv->phydev, 5, PTP_TX_TIMESTAMP_EN, pkt_ts_enable);
 
-	if (ptp_priv->hwts_tx_type == HWTSTAMP_TX_ONESTEP_SYNC)
+	tx_mod = lanphy_read_page_reg(ptp_priv->phydev, 5, PTP_TX_MOD);
+	if (ptp_priv->hwts_tx_type == HWTSTAMP_TX_ONESTEP_SYNC) {
 		lanphy_write_page_reg(ptp_priv->phydev, 5, PTP_TX_MOD,
-				      PTP_TX_MOD_TX_PTP_SYNC_TS_INSERT_);
+				      tx_mod | PTP_TX_MOD_TX_PTP_SYNC_TS_INSERT_);
+	} else if (ptp_priv->hwts_tx_type == HWTSTAMP_TX_ON) {
+		lanphy_write_page_reg(ptp_priv->phydev, 5, PTP_TX_MOD,
+				      tx_mod & ~PTP_TX_MOD_TX_PTP_SYNC_TS_INSERT_);
+	}
 
 	if (config->rx_filter != HWTSTAMP_FILTER_NONE)
 		lan8814_config_ts_intr(ptp_priv->phydev, true);
@@ -2537,7 +2543,7 @@ static void lan8814_txtstamp(struct mii_timestamper *mii_ts,
 	}
 }
 
-static void lan8814_get_sig_rx(struct sk_buff *skb, u16 *sig)
+static bool lan8814_get_sig_rx(struct sk_buff *skb, u16 *sig)
 {
 	struct ptp_header *ptp_header;
 	u32 type;
@@ -2547,7 +2553,11 @@ static void lan8814_get_sig_rx(struct sk_buff *skb, u16 *sig)
 	ptp_header = ptp_parse_header(skb, type);
 	skb_pull_inline(skb, ETH_HLEN);
 
+	if (!ptp_header)
+		return false;
+
 	*sig = (__force u16)(ntohs(ptp_header->sequence_id));
+	return true;
 }
 
 static bool lan8814_match_rx_skb(struct kszphy_ptp_priv *ptp_priv,
@@ -2559,7 +2569,8 @@ static bool lan8814_match_rx_skb(struct kszphy_ptp_priv *ptp_priv,
 	bool ret = false;
 	u16 skb_sig;
 
-	lan8814_get_sig_rx(skb, &skb_sig);
+	if (!lan8814_get_sig_rx(skb, &skb_sig))
+		return ret;
 
 	/* Iterate over all RX timestamps and match it with the received skbs */
 	spin_lock_irqsave(&ptp_priv->rx_ts_lock, flags);
@@ -2834,7 +2845,7 @@ static int lan8814_ptpci_adjfine(struct ptp_clock_info *ptpci, long scaled_ppm)
 	return 0;
 }
 
-static void lan8814_get_sig_tx(struct sk_buff *skb, u16 *sig)
+static bool lan8814_get_sig_tx(struct sk_buff *skb, u16 *sig)
 {
 	struct ptp_header *ptp_header;
 	u32 type;
@@ -2842,7 +2853,11 @@ static void lan8814_get_sig_tx(struct sk_buff *skb, u16 *sig)
 	type = ptp_classify_raw(skb);
 	ptp_header = ptp_parse_header(skb, type);
 
+	if (!ptp_header)
+		return false;
+
 	*sig = (__force u16)(ntohs(ptp_header->sequence_id));
+	return true;
 }
 
 static void lan8814_match_tx_skb(struct kszphy_ptp_priv *ptp_priv,
@@ -2856,7 +2871,8 @@ static void lan8814_match_tx_skb(struct kszphy_ptp_priv *ptp_priv,
 
 	spin_lock_irqsave(&ptp_priv->tx_queue.lock, flags);
 	skb_queue_walk_safe(&ptp_priv->tx_queue, skb, skb_tmp) {
-		lan8814_get_sig_tx(skb, &skb_sig);
+		if (!lan8814_get_sig_tx(skb, &skb_sig))
+			continue;
 
 		if (memcmp(&skb_sig, &seq_id, sizeof(seq_id)))
 			continue;
@@ -2910,7 +2926,8 @@ static bool lan8814_match_skb(struct kszphy_ptp_priv *ptp_priv,
 
 	spin_lock_irqsave(&ptp_priv->rx_queue.lock, flags);
 	skb_queue_walk_safe(&ptp_priv->rx_queue, skb, skb_tmp) {
-		lan8814_get_sig_rx(skb, &skb_sig);
+		if (!lan8814_get_sig_rx(skb, &skb_sig))
+			continue;
 
 		if (memcmp(&skb_sig, &rx_ts->seq_id, sizeof(rx_ts->seq_id)))
 			continue;