From: Alexander Sverdlin Support newly introduced maxlinear,mii-slew-rate-slow device tree property to configure R(G)MII interface pins slew rate into "slow" mode. It might be used to reduce the radiated emissions. Signed-off-by: Alexander Sverdlin --- drivers/net/dsa/lantiq/mxl-gsw1xx.c | 6 ++++++ drivers/net/dsa/lantiq/mxl-gsw1xx.h | 2 ++ 2 files changed, 8 insertions(+) diff --git a/drivers/net/dsa/lantiq/mxl-gsw1xx.c b/drivers/net/dsa/lantiq/mxl-gsw1xx.c index 0816c61a47f12..ec7b92f62dcb5 100644 --- a/drivers/net/dsa/lantiq/mxl-gsw1xx.c +++ b/drivers/net/dsa/lantiq/mxl-gsw1xx.c @@ -526,6 +526,12 @@ static struct phylink_pcs *gsw1xx_phylink_mac_select_pcs(struct phylink_config * switch (dp->index) { case GSW1XX_SGMII_PORT: return &gsw1xx_priv->pcs; + case GSW1XX_MII_PORT: + if (of_property_read_bool(dp->dn, "maxlinear,mii-slew-rate-slow")) + regmap_set_bits(gsw1xx_priv->shell, + RGMII_SLEW_CFG_DRV_TXD | RGMII_SLEW_CFG_DRV_TXC, + GSW1XX_SHELL_RGMII_SLEW_CFG); + return NULL; default: return NULL; } diff --git a/drivers/net/dsa/lantiq/mxl-gsw1xx.h b/drivers/net/dsa/lantiq/mxl-gsw1xx.h index 38e03c048a26c..8c0298b2b7663 100644 --- a/drivers/net/dsa/lantiq/mxl-gsw1xx.h +++ b/drivers/net/dsa/lantiq/mxl-gsw1xx.h @@ -110,6 +110,8 @@ #define GSW1XX_RST_REQ_SGMII_SHELL BIT(5) /* RGMII PAD Slew Control Register */ #define GSW1XX_SHELL_RGMII_SLEW_CFG 0x78 +#define RGMII_SLEW_CFG_DRV_TXC BIT(2) +#define RGMII_SLEW_CFG_DRV_TXD BIT(3) #define RGMII_SLEW_CFG_RX_2_5_V BIT(4) #define RGMII_SLEW_CFG_TX_2_5_V BIT(5) -- 2.52.0