netdev - [PATCH net-next 2/2] net: stmmac: select STMMAC_RELATIVE_FLEX

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Message-ID: <20250724-relative_flex_pps-v1-2-37ca65773369@foss.st.com>
Date: Thu, 24 Jul 2025 14:31:19 +0200
From: Gatien Chevallier <gatien.chevallier@...s.st.com>
To: Andrew Lunn <andrew+netdev@...n.ch>,
        "David S. Miller"
	<davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Richard Cochran <richardcochran@...il.com>
CC: <netdev@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Gatien Chevallier <gatien.chevallier@...s.st.com>
Subject: [PATCH net-next 2/2] net: stmmac: select STMMAC_RELATIVE_FLEX_PPS
 for stm32 SoCs

In order to simplify the generation of flexible PPS signals by passing
an time offset relative to the MAC system time, select
STMMAC_RELATIVE_FLEX_PPS for DWMAC_STM32 config.

E.g: "echo "0 3 0 1 1" > /sys/class/ptp/ptp0/period" generates a PPS
that has a 1s period, 3 seconds after entering the command for ptp0 clock,
given that the MAC system time stays stable.

Signed-off-by: Gatien Chevallier <gatien.chevallier@...s.st.com>
---
 drivers/net/ethernet/stmicro/stmmac/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 949c744d30f19f5ff480dca4811e678d2b93c450..98fae30ad5a2760ec6b9cebf3dcaf8e4d7d19b77 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -233,6 +233,7 @@ config DWMAC_STM32
 	default ARCH_STM32
 	depends on OF && HAS_IOMEM && (ARCH_STM32 || COMPILE_TEST)
 	select MFD_SYSCON
+	select STMMAC_RELATIVE_FLEX_PPS
 	help
 	  Support for ethernet controller on STM32 SOCs.
 

-- 
2.25.1