[PATCH net-next 4/4] ptp: netc: use 133MHz as the default reference clock rate for i.MX952

[xiaoning . wang]

From: Clark Wang <xiaoning.wang@xxxxxxx>

If the 'clocks' property is not present in the DT node, the NETC system
clock is selected as the reference clock of the NETC Timer, and the
driver assumes that its rate is 333MHz. However, the NETC system clock
of i.MX952 (NETC v4.6) is 133MHz. Therefore, use 133MHz as the default
reference clock rate for i.MX952.

Signed-off-by: Clark Wang <xiaoning.wang@xxxxxxx>
---
 drivers/ptp/ptp_netc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_netc.c b/drivers/ptp/ptp_netc.c
index 19ca99d80e95..e2f7dd8595f1 100644
--- a/drivers/ptp/ptp_netc.c
+++ b/drivers/ptp/ptp_netc.c
@@ -72,6 +72,7 @@
 #define NETC_GLOBAL_IPBRR0		0xbf8
 #define  IPBRR0_IP_REV			GENMASK(15, 0)
 #define NETC_REV_4_1			0x0401
+#define NETC_REV_4_6			0x0406
 
 #define NETC_TMR_FIPER_NUM		3
 #define NETC_TMR_INVALID_CHANNEL	NETC_TMR_FIPER_NUM
@@ -88,6 +89,7 @@
 #define NETC_TMR_EXT_OSC		2 /* tmr_1588_clk, from IO pins */
 
 #define NETC_TMR_SYSCLK_333M		333333333U
+#define NETC_TMR_SYSCLK_133M		133333333U
 
 enum netc_pp_type {
 	NETC_PP_PPS = 1,
@@ -858,7 +860,10 @@ static int netc_timer_get_reference_clk_source(struct netc_timer *priv)
 
 	/* Select NETC system clock as the reference clock by default */
 	priv->clk_select = NETC_TMR_SYSTEM_CLK;
-	priv->clk_freq = NETC_TMR_SYSCLK_333M;
+	if (priv->revision == NETC_REV_4_6)
+		priv->clk_freq = NETC_TMR_SYSCLK_133M;
+	else
+		priv->clk_freq = NETC_TMR_SYSCLK_333M;
 
 	/* Update the clock source of the reference clock if the clock
 	 * is specified in DT node.
-- 
2.43.0