net/designware: add support of max-speed device tree property

This property allows to specify fastest connection mode supported by
the MAC (as opposed to features of the phy).

There are situations when phy may handle faster modes than the
MAC (or even it's particular implementation or even due to CPU being too
slow).

This property is a standard one in Linux kernel these days and some
boards do already use it in their device tree descriptions.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Sonic Zhang <sonic.zhang@analog.com>
cc: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

diff --git a/drivers/net/designware.c b/drivers/net/designware.c
index f28e825bfc39497e2792eee4c29e6debdc770c99..f1bcc92a81d42c9c08e811cf6a94214f7a4269c0 100644 (file)
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -406,7 +406,7 @@ static int _dw_free_pkt(struct dw_eth_dev *priv)
 static int dw_phy_init(struct dw_eth_dev *priv, void *dev)
 {
        struct phy_device *phydev;
-       int mask = 0xffffffff;
+       int mask = 0xffffffff, ret;
 
 #ifdef CONFIG_PHY_ADDR
        mask = 1 << CONFIG_PHY_ADDR;
@@ -419,6 +419,11 @@ static int dw_phy_init(struct dw_eth_dev *priv, void *dev)
        phy_connect_dev(phydev, dev);
 
        phydev->supported &= PHY_GBIT_FEATURES;
+       if (priv->max_speed) {
+               ret = phy_set_supported(phydev, priv->max_speed);
+               if (ret)
+                       return ret;
+       }
        phydev->advertising = phydev->supported;
 
        priv->phydev = phydev;
@@ -601,6 +606,7 @@ static int designware_eth_probe(struct udevice *dev)
        priv->mac_regs_p = (struct eth_mac_regs *)iobase;
        priv->dma_regs_p = (struct eth_dma_regs *)(iobase + DW_DMA_BASE_OFFSET);
        priv->interface = pdata->phy_interface;
+       priv->max_speed = pdata->max_speed;
 
        dw_mdio_init(dev->name, priv->mac_regs_p);
        priv->bus = miiphy_get_dev_by_name(dev->name);
@@ -635,6 +641,7 @@ static int designware_eth_ofdata_to_platdata(struct udevice *dev)
 {
        struct eth_pdata *pdata = dev_get_platdata(dev);
        const char *phy_mode;
+       const fdt32_t *cell;
 
        pdata->iobase = dev_get_addr(dev);
        pdata->phy_interface = -1;
@@ -646,6 +653,11 @@ static int designware_eth_ofdata_to_platdata(struct udevice *dev)
                return -EINVAL;
        }
 
+       pdata->max_speed = 0;
+       cell = fdt_getprop(gd->fdt_blob, dev->of_offset, "max-speed", NULL);
+       if (cell)
+               pdata->max_speed = fdt32_to_cpu(*cell);
+
        return 0;
 }
 

diff --git a/drivers/net/designware.h b/drivers/net/designware.h
index 4b9ec39cc82a05e0b33ecc85a8b914c85da01777..ed6344cc28f3cfdde713d27476be8abf2f8fb30b 100644 (file)
--- a/drivers/net/designware.h
+++ b/drivers/net/designware.h
@@ -223,6 +223,7 @@ struct dw_eth_dev {
        char rxbuffs[RX_TOTAL_BUFSIZE] __aligned(ARCH_DMA_MINALIGN);
 
        u32 interface;
+       u32 max_speed;
        u32 tx_currdescnum;
        u32 rx_currdescnum;