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net: phy: ksz90x1: Load skew values from device tree

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Various signal skew values may be set in the device tree for the ksz9131
Ethernet PHY. For example, the RZ/G2L board requires non-default values
for rxc-skew-psec & txc-skew-psec.

This is based on the ksz9131 phy driver in Linux v6.11.

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
This commit is contained in:
Paul Barker
2025-02-28 12:47:54 +00:00
committed by Marek Vasut
parent fbc3539456
commit 28e85996ff
1 changed files with 115 additions and 0 deletions
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115
drivers/net/phy/micrel_ksz90x1.c
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@@ -395,6 +395,117 @@ U_BOOT_PHY_DRIVER(ksz9031) = {
#define KSZ9131RN_LED_ERRATA_REG 0x1e
#define KSZ9131RN_LED_ERRATA_BIT BIT(9)
#define KSZ9131RN_CONTROL_PAD_SKEW 4
#define KSZ9131RN_RX_DATA_PAD_SKEW 5
#define KSZ9131RN_TX_DATA_PAD_SKEW 6
#define KSZ9131RN_CLK_PAD_SKEW 8
#define KSZ9131RN_SKEW_5BIT_MAX 2400
#define KSZ9131RN_SKEW_4BIT_MAX 800
#define KSZ9131RN_OFFSET 700
#define KSZ9131RN_STEP 100
static int ksz9131_of_load_skew_values(struct phy_device *phydev,
ofnode of_node,
u16 reg, size_t field_sz,
const char *field[], u8 numfields)
{
int val[4] = {-(1 + KSZ9131RN_OFFSET), -(2 + KSZ9131RN_OFFSET),
-(3 + KSZ9131RN_OFFSET), -(4 + KSZ9131RN_OFFSET)};
int skewval, skewmax = 0;
int matches = 0;
u16 maxval;
u16 newval;
u16 mask;
int i;
/* psec properties in dts should mean x pico seconds */
if (field_sz == 5)
skewmax = KSZ9131RN_SKEW_5BIT_MAX;
else
skewmax = KSZ9131RN_SKEW_4BIT_MAX;
for (i = 0; i < numfields; i++)
if (!ofnode_read_s32(of_node, field[i], &skewval)) {
if (skewval < -KSZ9131RN_OFFSET)
skewval = -KSZ9131RN_OFFSET;
else if (skewval > skewmax)
skewval = skewmax;
val[i] = skewval + KSZ9131RN_OFFSET;
matches++;
}
if (!matches)
return 0;
if (matches < numfields)
newval = phy_read_mmd(phydev, KSZ9131RN_MMD_COMMON_CTRL_REG, reg);
else
newval = 0;
maxval = (field_sz == 4) ? 0xf : 0x1f;
for (i = 0; i < numfields; i++)
if (val[i] != -(i + 1 + KSZ9131RN_OFFSET)) {
mask = 0xffff;
mask ^= maxval << (field_sz * i);
newval = (newval & mask) |
(((val[i] / KSZ9131RN_STEP) & maxval)
<< (field_sz * i));
}
return phy_write_mmd(phydev, KSZ9131RN_MMD_COMMON_CTRL_REG, reg, newval);
}
static int ksz9131_of_load_all_skew_values(struct phy_device *phydev)
{
const char *control_skews[2] = { "txen-skew-psec", "rxdv-skew-psec" };
const char *clk_skews[2] = { "rxc-skew-psec", "txc-skew-psec" };
const char *rx_data_skews[4] = {
"rxd0-skew-psec", "rxd1-skew-psec",
"rxd2-skew-psec", "rxd3-skew-psec"
};
const char *tx_data_skews[4] = {
"txd0-skew-psec", "txd1-skew-psec",
"txd2-skew-psec", "txd3-skew-psec"
};
struct ofnode_phandle_args phandle_args;
int ret;
/*
* Silently ignore failure here as the device tree is not required to
* contain a phy node.
*/
if (dev_read_phandle_with_args(phydev->dev, "phy-handle", NULL, 0, 0,
&phandle_args))
return 0;
if (!ofnode_valid(phandle_args.node))
return 0;
ret = ksz9131_of_load_skew_values(phydev, phandle_args.node,
KSZ9131RN_CLK_PAD_SKEW, 5,
clk_skews, 2);
if (ret < 0)
return ret;
ret = ksz9131_of_load_skew_values(phydev, phandle_args.node,
KSZ9131RN_CONTROL_PAD_SKEW, 4,
control_skews, 2);
if (ret < 0)
return ret;
ret = ksz9131_of_load_skew_values(phydev, phandle_args.node,
KSZ9131RN_RX_DATA_PAD_SKEW, 4,
rx_data_skews, 4);
if (ret < 0)
return ret;
return ksz9131_of_load_skew_values(phydev, phandle_args.node,
KSZ9131RN_TX_DATA_PAD_SKEW, 4,
tx_data_skews, 4);
}
static int ksz9131_config_rgmii_delay(struct phy_device *phydev)
{
struct phy_driver *drv = phydev->drv;
@@ -474,6 +585,10 @@ static int ksz9131_config(struct phy_device *phydev)
return ret;
}
ret = ksz9131_of_load_all_skew_values(phydev);
if (ret < 0)
return ret;
ret = ksz9131_led_errata(phydev);
if (ret < 0)
return ret;