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78 lines
3.1 KiB
Diff
78 lines
3.1 KiB
Diff
From 9cbadf094d9d479413dc8cfa77dff9e732184337 Mon Sep 17 00:00:00 2001
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From: Srinivas Kandagatla <srinivas.kandagatla@st.com>
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Date: Thu, 16 Jan 2014 10:51:43 +0000
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Subject: [PATCH] net: stmmac: support max-speed device tree property
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This patch adds support to "max-speed" property which is a standard
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Ethernet device tree property. max-speed specifies maximum speed
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(specified in megabits per second) supported the device.
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Depending on the clocking schemes some of the boards can only support
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few link speeds, so having a way to limit the link speed in the mac
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driver would allow such setups to work reliably.
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Without this patch there is no way to tell the driver to limit the
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link speed.
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
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Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 +++-
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drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 4 ++++
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include/linux/stmmac.h | 1 +
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3 files changed, 8 insertions(+), 1 deletion(-)
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diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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index ecdc8ab..15192c0 100644
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--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@@ -776,6 +776,7 @@ static int stmmac_init_phy(struct net_device *dev)
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char phy_id_fmt[MII_BUS_ID_SIZE + 3];
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char bus_id[MII_BUS_ID_SIZE];
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int interface = priv->plat->interface;
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+ int max_speed = priv->plat->max_speed;
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priv->oldlink = 0;
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priv->speed = 0;
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priv->oldduplex = -1;
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@@ -800,7 +801,8 @@ static int stmmac_init_phy(struct net_device *dev)
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/* Stop Advertising 1000BASE Capability if interface is not GMII */
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if ((interface == PHY_INTERFACE_MODE_MII) ||
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- (interface == PHY_INTERFACE_MODE_RMII))
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+ (interface == PHY_INTERFACE_MODE_RMII) ||
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+ (max_speed < 1000 && max_speed > 0))
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phydev->advertising &= ~(SUPPORTED_1000baseT_Half |
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SUPPORTED_1000baseT_Full);
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diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
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index 38bd1f4..9377ee6 100644
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--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
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+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
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@@ -42,6 +42,10 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
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*mac = of_get_mac_address(np);
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plat->interface = of_get_phy_mode(np);
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+ /* Get max speed of operation from device tree */
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+ if (of_property_read_u32(np, "max-speed", &plat->max_speed))
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+ plat->max_speed = -1;
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+
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plat->bus_id = of_alias_get_id(np, "ethernet");
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if (plat->bus_id < 0)
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plat->bus_id = 0;
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diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
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index bb5deb0..33ace71 100644
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--- a/include/linux/stmmac.h
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+++ b/include/linux/stmmac.h
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@@ -110,6 +110,7 @@ struct plat_stmmacenet_data {
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int force_sf_dma_mode;
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int force_thresh_dma_mode;
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int riwt_off;
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+ int max_speed;
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void (*fix_mac_speed)(void *priv, unsigned int speed);
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void (*bus_setup)(void __iomem *ioaddr);
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int (*init)(struct platform_device *pdev);
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--
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1.8.5.5
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