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net: sunxi_emac: chase DT nodes to find PHY regulator

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At the moment the sun4i EMAC driver relies on hardcoded CONFIG_MACPWR
Kconfig symbols to enable potential PHY regulators. As we want to get rid
of those, we need to find the regulator by chasing up the DT.

The sun4i-emac binding puts the PHY regulator into the MDIO node, which
is the parent of the PHY device. U-Boot does not have (and does not
need) an MDIO driver, so we need to chase down the regulator through the
EMAC node: we follow the "phy-handle" property to find the PHY node,
then go up to its parent, where we find the "phy-supply" link to the
regulator. Let U-Boot find the associated regulator device, and put that
into the private device struct, so we can find and enable the regulator
at probe time, later.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Sam Edwards <CFSworks@gmail.com>
Reviewed-by: Samuel Holland <samuel@sholland.org>
This commit is contained in:
Andre Przywara 2023-06-13 23:35:06 +01:00
parent ae79c1d01f
commit 091442993c
1 changed files with 38 additions and 0 deletions
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38
drivers/net/sunxi_emac.c
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@ -17,6 +17,7 @@
#include <net.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <power/regulator.h>
/* EMAC register */
struct emac_regs {
@ -165,6 +166,7 @@ struct emac_eth_dev {
struct phy_device *phydev;
int link_printed;
uchar rx_buf[EMAC_RX_BUFSIZE];
struct udevice *phy_reg;
};
struct emac_rxhdr {
@ -572,6 +574,9 @@ static int sunxi_emac_eth_probe(struct udevice *dev)
if (ret)
return ret;
if (priv->phy_reg)
regulator_set_enable(priv->phy_reg, true);
return sunxi_emac_init_phy(priv, dev);
}
@ -585,9 +590,42 @@ static const struct eth_ops sunxi_emac_eth_ops = {
static int sunxi_emac_eth_of_to_plat(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_plat(dev);
struct emac_eth_dev *priv = dev_get_priv(dev);
struct ofnode_phandle_args args;
ofnode phy_node, mdio_node;
int ret;
pdata->iobase = dev_read_addr(dev);
phy_node = dev_get_phy_node(dev);
if (phy_node == ofnode_null()) {
dev_err(dev, "failed to get PHY node\n");
return ret;
}
/*
* The PHY regulator is in the MDIO node, not the EMAC or PHY node.
* U-Boot does not have (and does not need) a device driver for the
* MDIO device, so just "pass through" that DT node to get to the
* regulator phandle.
* The PHY regulator is optional, though: ignore if we cannot find
* a phy-supply property.
*/
mdio_node = ofnode_get_parent(phy_node);
ret= ofnode_parse_phandle_with_args(mdio_node, "phy-supply", NULL, 0, 0,
&args);
if (ret && ret != -ENOENT) {
dev_err(dev, "failed to get PHY supply node\n");
return ret;
}
if (!ret) {
ret = uclass_get_device_by_ofnode(UCLASS_REGULATOR, args.node,
&priv->phy_reg);
if (ret) {
dev_err(dev, "failed to get PHY regulator node\n");
return ret;
}
}
return 0;
}