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Date: Wed, 6 Feb 2019 22:53:22 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Moritz Fischer <mdf@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
netdev@...r.kernel.org, colin.king@...onical.com,
linus.walleij@...aro.org, yuehaibing@...wei.com, mcgrof@...nel.org,
frowand.list@...il.com, robh+dt@...nel.org,
UNGLinuxDriver@...rochip.com, woojung.huh@...rochip.com,
hkallweit1@...il.com, davem@...emloft.net, f.fainelli@...il.com,
vivien.didelot@...il.com, moritz@...us.com, alex.williams@...com
Subject: Re: [RFC net-next] net: fixed_phy: Move the DT based link GPIO
parsing to of_mdio.c
On Wed, Feb 06, 2019 at 12:51:06PM -0800, Moritz Fischer wrote:
> Move the DT based link GPIO parsing to of_mdio and let the places
> that register a fixed_phy pass in a GPIO descriptor or NULL.
>
> This allows fixed_phy on non-DT platforms to have link GPIOs, too.
>
> Signed-off-by: Moritz Fischer <mdf@...nel.org>
> ---
> drivers/net/dsa/dsa_loop.c | 2 +-
> drivers/net/ethernet/broadcom/bgmac.c | 2 +-
> drivers/net/ethernet/broadcom/genet/bcmmii.c | 2 +-
> drivers/net/phy/fixed_phy.c | 48 ++------------------
> drivers/net/usb/lan78xx.c | 2 +-
> drivers/of/of_mdio.c | 15 +++++-
> include/linux/phy_fixed.h | 3 +-
> 7 files changed, 23 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/net/dsa/dsa_loop.c b/drivers/net/dsa/dsa_loop.c
> index 17482ae09aa5..7f124c620092 100644
> --- a/drivers/net/dsa/dsa_loop.c
> +++ b/drivers/net/dsa/dsa_loop.c
> @@ -343,7 +343,7 @@ static int __init dsa_loop_init(void)
> unsigned int i;
>
> for (i = 0; i < NUM_FIXED_PHYS; i++)
> - phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
> + phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL, NULL);
>
> return mdio_driver_register(&dsa_loop_drv);
> }
> diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
> index 4632dd5dbad1..bce644dec5c2 100644
> --- a/drivers/net/ethernet/broadcom/bgmac.c
> +++ b/drivers/net/ethernet/broadcom/bgmac.c
> @@ -1446,7 +1446,7 @@ int bgmac_phy_connect_direct(struct bgmac *bgmac)
> struct phy_device *phy_dev;
> int err;
>
> - phy_dev = fixed_phy_register(PHY_POLL, &fphy_status, NULL);
> + phy_dev = fixed_phy_register(PHY_POLL, &fphy_status, NULL, NULL);
> if (!phy_dev || IS_ERR(phy_dev)) {
> dev_err(bgmac->dev, "Failed to register fixed PHY device\n");
> return -ENODEV;
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
> index 51880d83131a..7cbd737aba80 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
> @@ -525,7 +525,7 @@ static int bcmgenet_mii_pd_init(struct bcmgenet_priv *priv)
> .asym_pause = 0,
> };
>
> - phydev = fixed_phy_register(PHY_POLL, &fphy_status, NULL);
> + phydev = fixed_phy_register(PHY_POLL, &fphy_status, NULL, NULL);
> if (!phydev || IS_ERR(phydev)) {
> dev_err(kdev, "failed to register fixed PHY device\n");
> return -ENODEV;
> diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c
> index d810f914aaa4..845bd7c2065a 100644
> --- a/drivers/net/phy/fixed_phy.c
> +++ b/drivers/net/phy/fixed_phy.c
> @@ -18,6 +18,7 @@
> #include <linux/err.h>
> #include <linux/slab.h>
> #include <linux/of.h>
> +#include <linux/of_mdio.h>
> #include <linux/gpio/consumer.h>
> #include <linux/seqlock.h>
> #include <linux/idr.h>
> @@ -191,50 +192,12 @@ static void fixed_phy_del(int phy_addr)
> }
> }
>
> -#ifdef CONFIG_OF_GPIO
> -static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np)
> -{
> - struct device_node *fixed_link_node;
> - struct gpio_desc *gpiod;
> -
> - if (!np)
> - return NULL;
> -
> - fixed_link_node = of_get_child_by_name(np, "fixed-link");
> - if (!fixed_link_node)
> - return NULL;
> -
> - /*
> - * As the fixed link is just a device tree node without any
> - * Linux device associated with it, we simply have obtain
> - * the GPIO descriptor from the device tree like this.
> - */
> - gpiod = gpiod_get_from_of_node(fixed_link_node, "link-gpios", 0,
> - GPIOD_IN, "mdio");
> - of_node_put(fixed_link_node);
> - if (IS_ERR(gpiod)) {
> - if (PTR_ERR(gpiod) == -EPROBE_DEFER)
> - return gpiod;
> - pr_err("error getting GPIO for fixed link %pOF, proceed without\n",
> - fixed_link_node);
> - gpiod = NULL;
> - }
> -
> - return gpiod;
> -}
> -#else
> -static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np)
> -{
> - return NULL;
> -}
> -#endif
> -
> struct phy_device *fixed_phy_register(unsigned int irq,
> struct fixed_phy_status *status,
> - struct device_node *np)
> + struct device_node *np,
> + struct gpio_desc *gpiod)
> {
> struct fixed_mdio_bus *fmb = &platform_fmb;
> - struct gpio_desc *gpiod = NULL;
> struct phy_device *phy;
> int phy_addr;
> int ret;
> @@ -242,11 +205,6 @@ struct phy_device *fixed_phy_register(unsigned int irq,
> if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED)
> return ERR_PTR(-EPROBE_DEFER);
>
> - /* Check if we have a GPIO associated with this fixed phy */
> - gpiod = fixed_phy_get_gpiod(np);
> - if (IS_ERR(gpiod))
> - return ERR_CAST(gpiod);
> -
> /* Get the next available PHY address, up to PHY_MAX_ADDR */
> phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL);
> if (phy_addr < 0)
> diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
> index 3d92ea6fcc02..bd88f0aef2fa 100644
> --- a/drivers/net/usb/lan78xx.c
> +++ b/drivers/net/usb/lan78xx.c
> @@ -2051,7 +2051,7 @@ static struct phy_device *lan7801_phy_init(struct lan78xx_net *dev)
> phydev = phy_find_first(dev->mdiobus);
> if (!phydev) {
> netdev_dbg(dev->net, "PHY Not Found!! Registering Fixed PHY\n");
> - phydev = fixed_phy_register(PHY_POLL, &fphy_status, NULL);
> + phydev = fixed_phy_register(PHY_POLL, &fphy_status, NULL, NULL);
> if (IS_ERR(phydev)) {
> netdev_err(dev->net, "No PHY/fixed_PHY found\n");
> return NULL;
> diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
> index de6157357e26..6be2120b5f03 100644
> --- a/drivers/of/of_mdio.c
> +++ b/drivers/of/of_mdio.c
> @@ -20,6 +20,7 @@
> #include <linux/of_mdio.h>
> #include <linux/of_net.h>
> #include <linux/module.h>
> +#include <linux/gpio/consumer.h>
>
> #define DEFAULT_GPIO_RESET_DELAY 10 /* in microseconds */
>
> @@ -460,6 +461,7 @@ int of_phy_register_fixed_link(struct device_node *np)
> {
> struct fixed_phy_status status = {};
> struct device_node *fixed_link_node;
> + struct gpio_desc *gpiod = NULL;
> u32 fixed_link_prop[5];
> const char *managed;
>
> @@ -483,7 +485,17 @@ int of_phy_register_fixed_link(struct device_node *np)
> status.pause = of_property_read_bool(fixed_link_node, "pause");
> status.asym_pause = of_property_read_bool(fixed_link_node,
> "asym-pause");
> +
> + gpiod = gpiod_get_from_of_node(fixed_link_node, "link-gpios", 0,
> + GPIOD_IN, "mdio");
> of_node_put(fixed_link_node);
> + if (IS_ERR(gpiod)) {
> + if (PTR_ERR(gpiod) == -EPROBE_DEFER)
> + return PTR_ERR(gpiod);
> + pr_err("error getting GPIO for fixed link %pOF, proceed without\n",
> + fixed_link_node);
> + gpiod = NULL;
> extern struct phy_device *fixed_phy_register(unsigned int irq,
> struct fixed_phy_status *status,
> - struct device_node *np);
> + struct device_node *np,
> + struct gpio_desc *gpiod);
Hi Moritz
I think it would be better to add a
extern struct phy_device *fixed_phy_register_gpiod(unsigned int irq,
struct fixed_phy_status *status,
struct gpio_desc *gpiod);
If you are not using DT, the np is pointless. So lets keep the API
simple.
Andrew
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