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Message-ID: <ZBRtRw8pg0mcRxbZ@localhost.localdomain>
Date: Fri, 17 Mar 2023 14:38:15 +0100
From: Michal Kubiak <michal.kubiak@...el.com>
To: Christian Marangi <ansuelsmth@...il.com>
CC: Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
"Paolo Abeni" <pabeni@...hat.com>,
Rob Herring <robh+dt@...nel.org>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>,
Gregory Clement <gregory.clement@...tlin.com>,
Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
Andy Gross <agross@...nel.org>,
"Bjorn Andersson" <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
John Crispin <john@...ozen.org>, <netdev@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-arm-msm@...r.kernel.org>, "Lee Jones" <lee@...nel.org>,
<linux-leds@...r.kernel.org>
Subject: Re: [net-next PATCH v4 04/14] net: phy: Add a binding for PHY LEDs
On Fri, Mar 17, 2023 at 03:31:15AM +0100, Christian Marangi wrote:
> From: Andrew Lunn <andrew@...n.ch>
>
> Define common binding parsing for all PHY drivers with LEDs using
> phylib. Parse the DT as part of the phy_probe and add LEDs to the
> linux LED class infrastructure. For the moment, provide a dummy
> brightness function, which will later be replaced with a call into the
> PHY driver.
>
Hi Andrew,
Personally, I see no good reason to provide a dummy implementation
of "phy_led_set_brightness", especially if you implement it in the next
patch. You only use that function only the function pointer in
"led_classdev". I think you can just skip it in this patch.
Please find the rest of my comments inline.
Thanks,
Michal
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
> drivers/net/phy/Kconfig | 1 +
> drivers/net/phy/phy_device.c | 75 ++++++++++++++++++++++++++++++++++++
> include/linux/phy.h | 16 ++++++++
> 3 files changed, 92 insertions(+)
>
> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> index f5df2edc94a5..666efa6b1c8e 100644
> --- a/drivers/net/phy/Kconfig
> +++ b/drivers/net/phy/Kconfig
> @@ -16,6 +16,7 @@ config PHYLINK
> menuconfig PHYLIB
> tristate "PHY Device support and infrastructure"
> depends on NETDEVICES
> + depends on LEDS_CLASS
> select MDIO_DEVICE
> select MDIO_DEVRES
> help
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 9ba8f973f26f..ee800f93c8c3 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -19,10 +19,12 @@
> #include <linux/interrupt.h>
> #include <linux/io.h>
> #include <linux/kernel.h>
> +#include <linux/list.h>
> #include <linux/mdio.h>
> #include <linux/mii.h>
> #include <linux/mm.h>
> #include <linux/module.h>
> +#include <linux/of.h>
> #include <linux/netdevice.h>
> #include <linux/phy.h>
> #include <linux/phy_led_triggers.h>
> @@ -658,6 +660,7 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id,
> device_initialize(&mdiodev->dev);
>
> dev->state = PHY_DOWN;
> + INIT_LIST_HEAD(&dev->leds);
>
> mutex_init(&dev->lock);
> INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
> @@ -2964,6 +2967,73 @@ static bool phy_drv_supports_irq(struct phy_driver *phydrv)
> return phydrv->config_intr && phydrv->handle_interrupt;
> }
>
> +/* Dummy implementation until calls into PHY driver are added */
> +static int phy_led_set_brightness(struct led_classdev *led_cdev,
> + enum led_brightness value)
> +{
> + return 0;
> +}
It can be removed from this patch.
> +
> +static int of_phy_led(struct phy_device *phydev,
> + struct device_node *led)
> +{
> + struct device *dev = &phydev->mdio.dev;
> + struct led_init_data init_data = {};
> + struct led_classdev *cdev;
> + struct phy_led *phyled;
> + int err;
> +
> + phyled = devm_kzalloc(dev, sizeof(*phyled), GFP_KERNEL);
> + if (!phyled)
> + return -ENOMEM;
> +
> + cdev = &phyled->led_cdev;
> +
> + err = of_property_read_u32(led, "reg", &phyled->index);
> + if (err)
> + return err;
Memory leak. 'phyled' is not freed in case of error.
> +
> + cdev->brightness_set_blocking = phy_led_set_brightness;
Please move this initialization to the patch where you are actually
implementing this callback.
> + cdev->max_brightness = 1;
> + init_data.devicename = dev_name(&phydev->mdio.dev);
> + init_data.fwnode = of_fwnode_handle(led);
> +
> + err = devm_led_classdev_register_ext(dev, cdev, &init_data);
> + if (err)
> + return err;
Another memory leak.
> +
> + list_add(&phyled->list, &phydev->leds);
Where do you free the memory allocated for phy_led structure?
> +
> + return 0;
> +}
> +
> +static int of_phy_leds(struct phy_device *phydev)
> +{
> + struct device_node *node = phydev->mdio.dev.of_node;
> + struct device_node *leds, *led;
> + int err;
> +
> + if (!IS_ENABLED(CONFIG_OF_MDIO))
> + return 0;
> +
> + if (!node)
> + return 0;
> +
> + leds = of_get_child_by_name(node, "leds");
> + if (!leds)
> + return 0;
> +
> + for_each_available_child_of_node(leds, led) {
> + err = of_phy_led(phydev, led);
> + if (err) {
> + of_node_put(led);
> + return err;
> + }
> + }
> +
> + return 0;
> +}
> +
> /**
> * fwnode_mdio_find_device - Given a fwnode, find the mdio_device
> * @fwnode: pointer to the mdio_device's fwnode
> @@ -3142,6 +3212,11 @@ static int phy_probe(struct device *dev)
> /* Set the state to READY by default */
> phydev->state = PHY_READY;
>
> + /* Get the LEDs from the device tree, and instantiate standard
> + * LEDs for them.
> + */
> + err = of_phy_leds(phydev);
> +
> out:
> /* Assert the reset signal */
> if (err)
> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index fbeba4fee8d4..88a77ff60be9 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -14,6 +14,7 @@
> #include <linux/compiler.h>
> #include <linux/spinlock.h>
> #include <linux/ethtool.h>
> +#include <linux/leds.h>
> #include <linux/linkmode.h>
> #include <linux/netlink.h>
> #include <linux/mdio.h>
> @@ -595,6 +596,7 @@ struct macsec_ops;
> * @phy_num_led_triggers: Number of triggers in @phy_led_triggers
> * @led_link_trigger: LED trigger for link up/down
> * @last_triggered: last LED trigger for link speed
> + * @leds: list of PHY LED structures
> * @master_slave_set: User requested master/slave configuration
> * @master_slave_get: Current master/slave advertisement
> * @master_slave_state: Current master/slave configuration
> @@ -690,6 +692,7 @@ struct phy_device {
>
> struct phy_led_trigger *led_link_trigger;
> #endif
> + struct list_head leds;
>
> /*
> * Interrupt number for this PHY
> @@ -825,6 +828,19 @@ struct phy_plca_status {
> bool pst;
> };
>
> +/**
> + * struct phy_led: An LED driven by the PHY
> + *
> + * @list: List of LEDs
> + * @led_cdev: Standard LED class structure
> + * @index: Number of the LED
> + */
> +struct phy_led {
> + struct list_head list;
> + struct led_classdev led_cdev;
> + u32 index;
> +};
> +
> /**
> * struct phy_driver - Driver structure for a particular PHY type
> *
> --
> 2.39.2
>
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