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net: phy: realtek: Add optional external PHY clock

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In some cases, the PHY can use an external clock source instead of a
crystal.

Add an optional clock in the phy node to make sure that the clock source
is enabled, if specified, before probing.

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Detlev Casanova 2023-06-05 11:40:08 -04:00 committed by David S. Miller
parent 4cab498f33
commit 7300c9b574
1 changed files with 7 additions and 0 deletions
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7
drivers/net/phy/realtek.c
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@ -12,6 +12,7 @@
#include <linux/phy.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/clk.h>
#define RTL821x_PHYSR 0x11
#define RTL821x_PHYSR_DUPLEX BIT(13)
@ -80,6 +81,7 @@ struct rtl821x_priv {
u16 phycr1;
u16 phycr2;
bool has_phycr2;
struct clk *clk;
};
static int rtl821x_read_page(struct phy_device *phydev)
@ -103,6 +105,11 @@ static int rtl821x_probe(struct phy_device *phydev)
if (!priv)
return -ENOMEM;
priv->clk = devm_clk_get_optional_enabled(dev, NULL);
if (IS_ERR(priv->clk))
return dev_err_probe(dev, PTR_ERR(priv->clk),
"failed to get phy clock\n");
ret = phy_read_paged(phydev, 0xa43, RTL8211F_PHYCR1);
if (ret < 0)
return ret;