On Thu, Jul 20, 2023 at 06:47:43PM +0300, Roger Quadros wrote:
On 20/07/2023 12:55, Maxime Ripard wrote:
The binding represents the MDIO controller as a child device tree node of the MAC device tree node.
The U-Boot driver mostly ignores that child device tree node and just hardcodes the resources it uses to support both the MAC and MDIO in a single driver.
However, some resources like pinctrl muxing states are thus ignored. This has been a problem with device trees since Linux 6.5-rc1 which will put some pinctrl states on the MDIO device tree node.
Let's rework the driver a bit to fetch the pinctrl state from the MDIO node and apply it.
Signed-off-by: Maxime Ripard mripard@kernel.org
drivers/net/ti/am65-cpsw-nuss.c | 49 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+)
diff --git a/drivers/net/ti/am65-cpsw-nuss.c b/drivers/net/ti/am65-cpsw-nuss.c index f674b0baa359..2d579bf4af2c 100644 --- a/drivers/net/ti/am65-cpsw-nuss.c +++ b/drivers/net/ti/am65-cpsw-nuss.c @@ -15,6 +15,7 @@ #include <dm.h> #include <dm/device_compat.h> #include <dm/lists.h> +#include <dm/pinctrl.h> #include <dma-uclass.h> #include <dm/of_access.h> #include <miiphy.h> @@ -696,6 +697,50 @@ out: return ret; }
+static ofnode am65_cpsw_find_mdio(ofnode parent) +{
- ofnode node;
- ofnode_for_each_subnode(node, parent)
if (ofnode_device_is_compatible(node, "ti,cpsw-mdio"))return node;- return ofnode_null();
+}
+static int am65_cpsw_setup_mdio(struct udevice *dev) +{
- ofnode mdio;
- int ret;
- mdio = am65_cpsw_find_mdio(dev_ofnode(dev));
- if (!ofnode_valid(mdio))
return -ENODEV;- /*
* The MDIO controller is represented in the DT binding by a* subnode of the MAC controller.** Our driver largely ignores that and supports MDIO by* hardcoding the register offsets.** However, some resources (clocks, pinctrl) might be tied to* the MDIO node, and thus ignored.** Clocks are not a concern at the moment since it's shared* between the MAC and MDIO, so the driver handles both at the* same time.** However, we do need to make sure the pins states tied to the* MDIO node are configured properly.*/Please mention this as a HACK: that needs to go away when davinci_mdio and this driver properly supports MDIO infrastructure.
Will do
- ret = pinctrl_select_state_by_ofnode(dev, mdio, "default");
Instead of modifying the API, can we have a dummy driver for the "ti,davinci_mdio" device that registers as class UCLASS_MDIO but does nothing else?
Then you can drop patch 1 and instead do
ret = uclass_get_device_by_ofnode(UCLASS_MDIO, node, &mdio_dev); if (!ret) pinctrl_select_state(mdio_dev, "default");
Good idea, thanks :)
Maxime