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Message-ID: <db7325bd-aee0-a920-a60c-6ce113f833c0@gmail.com>
Date: Mon, 4 Sep 2017 10:00:35 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Corentin Labbe <clabbe.montjoie@...il.com>, andrew@...n.ch,
rjui@...adcom.com, sbranden@...adcom.com, jonmason@...adcom.com
Cc: bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] net: mdio-mux: add mdio_mux parameter to
mdio_mux_init()
On 09/04/2017 09:30 AM, Corentin Labbe wrote:
> mdio_mux_init() use the parameter dev for two distinct thing:
> 1) Have a device for all devm_ functions
> 2) Get device_node from it
>
> Since it is two distinct purpose, this patch add a parameter mdio_mux
> that is linked to task 2.
>
> This will also permit to register an of_node mdio-mux that lacks a direct
> owning device.
> For example a mdio-mux which is a subnode of a real device.
This looks fine, I was going to suggest introducing a wrapper around
mdio_mux_init() which does something along the lines below, but
considering the number of users of mdio_mux_init() within the kernel
tree, it's reasonably easy to audit those, therefore:
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
diff --git a/include/linux/mdio-mux.h b/include/linux/mdio-mux.h
index 61f5b21b31c7..0316186c91b5 100644
--- a/include/linux/mdio-mux.h
+++ b/include/linux/mdio-mux.h
@@ -12,11 +12,19 @@
#include <linux/device.h>
#include <linux/phy.h>
-int mdio_mux_init(struct device *dev,
- int (*switch_fn) (int cur, int desired, void *data),
- void **mux_handle,
- void *data,
- struct mii_bus *mux_bus);
+int mdio_mux_init_dn(struct device *dev, struct device_node *mux_node,
+ int (*switch_fn)(int cur, int desired, void *data),
+ void **mux_handle, void *data,
+ struct mii_bus *mux_bus);
+
+static inline int mdio_mux_init(struct device *dev,
+ int (*switch_fn)(int cur, int desired,
void *data),
+ void **mux_handle, void *data,
+ struct mii_bus *mux_bus)
+{
+ return mdio_mux_init_dn(dev, dev->of_node, switch_fn,
+ mux_handle, data, mux_bus);
+}
>
> Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> ---
> drivers/net/phy/mdio-mux-bcm-iproc.c | 2 +-
> drivers/net/phy/mdio-mux-gpio.c | 2 +-
> drivers/net/phy/mdio-mux-mmioreg.c | 3 ++-
> drivers/net/phy/mdio-mux.c | 7 ++++---
> include/linux/mdio-mux.h | 9 +++++++++
> 5 files changed, 17 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/phy/mdio-mux-bcm-iproc.c b/drivers/net/phy/mdio-mux-bcm-iproc.c
> index 0a5f62e0efcc..0831b7142df7 100644
> --- a/drivers/net/phy/mdio-mux-bcm-iproc.c
> +++ b/drivers/net/phy/mdio-mux-bcm-iproc.c
> @@ -199,7 +199,7 @@ static int mdio_mux_iproc_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, md);
>
> - rc = mdio_mux_init(md->dev, mdio_mux_iproc_switch_fn,
> + rc = mdio_mux_init(md->dev, md->dev->of_node, mdio_mux_iproc_switch_fn,
> &md->mux_handle, md, md->mii_bus);
> if (rc) {
> dev_info(md->dev, "mdiomux initialization failed\n");
> diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
> index 919949960a10..082ffef0dec4 100644
> --- a/drivers/net/phy/mdio-mux-gpio.c
> +++ b/drivers/net/phy/mdio-mux-gpio.c
> @@ -54,7 +54,7 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev)
> if (IS_ERR(s->gpios))
> return PTR_ERR(s->gpios);
>
> - r = mdio_mux_init(&pdev->dev,
> + r = mdio_mux_init(&pdev->dev, pdev->dev.of_node,
> mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL);
>
> if (r != 0) {
> diff --git a/drivers/net/phy/mdio-mux-mmioreg.c b/drivers/net/phy/mdio-mux-mmioreg.c
> index c3825c7da038..2573ab012f16 100644
> --- a/drivers/net/phy/mdio-mux-mmioreg.c
> +++ b/drivers/net/phy/mdio-mux-mmioreg.c
> @@ -159,7 +159,8 @@ static int mdio_mux_mmioreg_probe(struct platform_device *pdev)
> }
> }
>
> - ret = mdio_mux_init(&pdev->dev, mdio_mux_mmioreg_switch_fn,
> + ret = mdio_mux_init(&pdev->dev, pdev->dev.of_node,
> + mdio_mux_mmioreg_switch_fn,
> &s->mux_handle, s, NULL);
> if (ret) {
> dev_err(&pdev->dev, "failed to register mdio-mux bus %pOF\n",
> diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
> index 6f75e9f27fed..0a86f1e4c02f 100644
> --- a/drivers/net/phy/mdio-mux.c
> +++ b/drivers/net/phy/mdio-mux.c
> @@ -86,6 +86,7 @@ static int mdio_mux_write(struct mii_bus *bus, int phy_id,
> static int parent_count;
>
> int mdio_mux_init(struct device *dev,
> + struct device_node *mux_node,
> int (*switch_fn)(int cur, int desired, void *data),
> void **mux_handle,
> void *data,
> @@ -98,11 +99,11 @@ int mdio_mux_init(struct device *dev,
> struct mdio_mux_parent_bus *pb;
> struct mdio_mux_child_bus *cb;
>
> - if (!dev->of_node)
> + if (!mux_node)
> return -ENODEV;
>
> if (!mux_bus) {
> - parent_bus_node = of_parse_phandle(dev->of_node,
> + parent_bus_node = of_parse_phandle(mux_node,
> "mdio-parent-bus", 0);
>
> if (!parent_bus_node)
> @@ -132,7 +133,7 @@ int mdio_mux_init(struct device *dev,
> pb->mii_bus = parent_bus;
>
> ret_val = -ENODEV;
> - for_each_available_child_of_node(dev->of_node, child_bus_node) {
> + for_each_available_child_of_node(mux_node, child_bus_node) {
> int v;
>
> r = of_property_read_u32(child_bus_node, "reg", &v);
> diff --git a/include/linux/mdio-mux.h b/include/linux/mdio-mux.h
> index 61f5b21b31c7..a5d58f221939 100644
> --- a/include/linux/mdio-mux.h
> +++ b/include/linux/mdio-mux.h
> @@ -12,7 +12,16 @@
> #include <linux/device.h>
> #include <linux/phy.h>
>
> +/* mdio_mux_init() - Initialize a MDIO mux
> + * @dev The device owning the MDIO mux
> + * @mux_node The device node of the MDIO mux
> + * @switch_fn The function called for switching target MDIO child
> + * mux_handle A pointer to a (void *) used internaly by mdio-mux
> + * @data Private data used by switch_fn()
> + * @mux_bus An optional parent bus (Other case are to use parent_bus property)
> + */
> int mdio_mux_init(struct device *dev,
> + struct device_node *mux_node,
> int (*switch_fn) (int cur, int desired, void *data),
> void **mux_handle,
> void *data,
>
--
Florian
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