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net/phy: micrel: Add clock support for KSZ8021/KSZ8031 

The KSZ8021 and KSZ8031 support RMII reference input clocks of 25MHz
and 50MHz. Both PHYs differ in the default frequency they expect
after reset. If this differs from the actual input clock, then
register 0x1f bit 7 must be changed.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sascha Hauer 2014-10-10 09:48:05 +02:00 committed by David S. Miller
parent 5af7fb6e3e
commit 1fadee0c36
3 changed files with 36 additions and 2 deletions
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6
Documentation/devicetree/bindings/net/micrel.txt
View File

@ -16,3 +16,9 @@ Optional properties:
KSZ8051: register 0x1f, bits 5..4
See the respective PHY datasheet for the mode values.
- clocks, clock-names: contains clocks according to the common clock bindings.
supported clocks:
- KSZ8021, KSZ8031: "rmii-ref": The RMII refence input clock. Used
to determine the XI input clock.

31
drivers/net/phy/micrel.c
View File

@ -26,6 +26,7 @@
#include <linux/phy.h>
#include <linux/micrel_phy.h>
#include <linux/of.h>
#include <linux/clk.h>
/* Operation Mode Strap Override */
#define MII_KSZPHY_OMSO 0x16
@ -72,9 +73,12 @@ static int ksz_config_flags(struct phy_device *phydev)
{
int regval;
if (phydev->dev_flags & MICREL_PHY_50MHZ_CLK) {
if (phydev->dev_flags & (MICREL_PHY_50MHZ_CLK | MICREL_PHY_25MHZ_CLK)) {
regval = phy_read(phydev, MII_KSZPHY_CTRL);
regval |= KSZ8051_RMII_50MHZ_CLK;
if (phydev->dev_flags & MICREL_PHY_50MHZ_CLK)
regval |= KSZ8051_RMII_50MHZ_CLK;
else
regval &= ~KSZ8051_RMII_50MHZ_CLK;
return phy_write(phydev, MII_KSZPHY_CTRL, regval);
}
return 0;
@ -440,6 +444,27 @@ ksz9021_wr_mmd_phyreg(struct phy_device *phydev, int ptrad, int devnum,
{
}
static int ksz8021_probe(struct phy_device *phydev)
{
struct clk *clk;
clk = devm_clk_get(&phydev->dev, "rmii-ref");
if (!IS_ERR(clk)) {
unsigned long rate = clk_get_rate(clk);
if (rate > 24500000 && rate < 25500000) {
phydev->dev_flags |= MICREL_PHY_25MHZ_CLK;
} else if (rate > 49500000 && rate < 50500000) {
phydev->dev_flags |= MICREL_PHY_50MHZ_CLK;
} else {
dev_err(&phydev->dev, "Clock rate out of range: %ld\n", rate);
return -EINVAL;
}
}
return 0;
}
static struct phy_driver ksphy_driver[] = {
{
.phy_id = PHY_ID_KS8737,
@ -462,6 +487,7 @@ static struct phy_driver ksphy_driver[] = {
.features = (PHY_BASIC_FEATURES | SUPPORTED_Pause |
SUPPORTED_Asym_Pause),
.flags = PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
.probe = ksz8021_probe,
.config_init = ksz8021_config_init,
.config_aneg = genphy_config_aneg,
.read_status = genphy_read_status,
@ -477,6 +503,7 @@ static struct phy_driver ksphy_driver[] = {
.features = (PHY_BASIC_FEATURES | SUPPORTED_Pause |
SUPPORTED_Asym_Pause),
.flags = PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
.probe = ksz8021_probe,
.config_init = ksz8021_config_init,
.config_aneg = genphy_config_aneg,
.read_status = genphy_read_status,

1
include/linux/micrel_phy.h
View File

@ -37,6 +37,7 @@
/* struct phy_device dev_flags definitions */
#define MICREL_PHY_50MHZ_CLK 0x00000001
#define MICREL_PHY_25MHZ_CLK 0x00000002
#define MICREL_KSZ9021_EXTREG_CTRL 0xB
#define MICREL_KSZ9021_EXTREG_DATA_WRITE 0xC