[PATCH 1/4] phy: atheros: ar8035: Fix clock output calculation

[Fabio Estevam]

The clock ouput frequency is calculated incorrectly for AR8035 due to
wrong masking of priv->clk_25m_reg and priv->clk_25m_mask.

This same issue has been already fixed in the kernel by:

commit b1f4c209d84057b6d40b939b6e4404854271d797
Author: Oleksij Rempel <o.rempel at pengutronix.de>
Date:   Wed Apr 1 11:57:32 2020 +0200

    net: phy: at803x: fix clock sink configuration on ATH8030 and ATH8035

    The masks in priv->clk_25m_reg and priv->clk_25m_mask are one-bits-set
    for the values that comprise the fields, not zero-bits-set.

    This patch fixes the clock frequency configuration for ATH8030 and
    ATH8035 Atheros PHYs by removing the erroneous "~".

    To reproduce this bug, configure the PHY  with the device tree binding
    "qca,clk-out-frequency" and remove the machine specific PHY fixups.

    Fixes: 2f664823a47021 ("net: phy: at803x: add device tree binding")
    Signed-off-by: Oleksij Rempel <o.rempel at pengutronix.de>
    Reported-by: Russell King <rmk+kernel at armlinux.org.uk>
    Reviewed-by: Russell King <rmk+kernel at armlinux.org.uk>
    Tested-by: Russell King <rmk+kernel at armlinux.org.uk>
    Signed-off-by: David S. Miller <davem at davemloft.net>

Apply the same fix in the U-Boot driver.

Tested on a i.MX6 Hummingboard.

Signed-off-by: Fabio Estevam <festevam at gmail.com>
Reviewed-by: Michael Walle <michael at walle.cc>
---
 drivers/net/phy/atheros.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/atheros.c b/drivers/net/phy/atheros.c
index 13f7275d17..f922fecd6b 100644
--- a/drivers/net/phy/atheros.c
+++ b/drivers/net/phy/atheros.c
@@ -275,11 +275,10 @@ static int ar803x_of_init(struct phy_device *phydev)
 		 * Fixup for the AR8035 which only has two bits. The two
 		 * remaining bits map to the same frequencies.
 		 */
-		if (phydev->drv->uid == AR8035_PHY_ID) {
-			u16 clear = AR803x_CLK_25M_MASK & AR8035_CLK_25M_MASK;
 
-			priv->clk_25m_mask &= ~clear;
-			priv->clk_25m_reg &= ~clear;
+		if (phydev->drv->uid == AR8035_PHY_ID) {
+			priv->clk_25m_reg &= AR8035_CLK_25M_MASK;
+			priv->clk_25m_mask &= AR8035_CLK_25M_MASK;
 		}
 	}
 
-- 
2.17.1