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Date: Fri, 11 Dec 2015 09:44:52 +0800
From: Phil Reid <preid@...ctromag.com.au>
To: Giuseppe CAVALLARO <peppe.cavallaro@...com>, robh+dt@...nel.org,
pawel.moll@....com, mark.rutland@....com,
ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
davem@...emloft.net, vbridger@...nsource.altera.com,
devicetree@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v5 1/4] stmmac: create of compatible mdio bus for stmacc
driver
G'day Giuseppe,
On 11/12/2015 1:16 AM, Giuseppe CAVALLARO wrote:
> Hi
>
> also pls fix this typo
>
> stmmac: create of compatible mdio bus for stmacc driver
> ^^^^^^^^
> stmmac
Will do.
>
> On 12/9/2015 9:39 AM, Phil Reid wrote:
>> The DSA driver needs to be passed a reference to an mdio bus. Typically
>> the mac is configured to use a fixed link but the mdio bus still needs
>> to be registered so that it con configure the switch.
>> This patch follows the same process as the altera tse ethernet driver for
>> creation of the mdio bus.
>>
>> Acked-by: Rob Herring <robh@...nel.org>
>> Signed-off-by: Phil Reid <preid@...ctromag.com.au>
>> ---
>> Documentation/devicetree/bindings/net/stmmac.txt | 8 ++++++
>> drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 31 +++++++++++++++-------
>> .../net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 +-
>> 3 files changed, 31 insertions(+), 10 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
>> index f34fc3c..fd5ddf8 100644
>> --- a/Documentation/devicetree/bindings/net/stmmac.txt
>> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
>> @@ -47,6 +47,7 @@ Optional properties:
>> - snps,burst_len: The AXI burst lenth value of the AXI BUS MODE register.
>> - tx-fifo-depth: See ethernet.txt file in the same directory
>> - rx-fifo-depth: See ethernet.txt file in the same directory
>> +- mdio: with compatible = "snps,dwmac-mdio", create and register mdio bus.
>>
>> Examples:
>>
>> @@ -65,4 +66,11 @@ Examples:
>> tx-fifo-depth = <16384>;
>> clocks = <&clock>;
>> clock-names = "stmmaceth";
>> + mdio0 {
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> + compatible = "snps,dwmac-mdio";
>> + phy1: ethernet-phy@0 {
>> + };
>> + };
>> };
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>> index bba670c..bb6f75c 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
>> @@ -29,7 +29,7 @@
>> #include <linux/slab.h>
>> #include <linux/of.h>
>> #include <linux/of_gpio.h>
>> -
>> +#include <linux/of_mdio.h>
>> #include <asm/io.h>
>>
>> #include "stmmac.h"
>> @@ -200,10 +200,29 @@ int stmmac_mdio_register(struct net_device *ndev)
>> struct stmmac_priv *priv = netdev_priv(ndev);
>> struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
>> int addr, found;
>> + struct device_node *mdio_node = NULL;
>> + struct device_node *child_node = NULL;
>>
>> if (!mdio_bus_data)
>> return 0;
>>
>> + if (IS_ENABLED(CONFIG_OF)) {
>> + for_each_child_of_node(priv->device->of_node, child_node) {
>> + if (of_device_is_compatible(child_node,
>> + "snps,dwmac-mdio")) {
>> + mdio_node = child_node;
>> + break;
>> + }
>> + }
>> +
>> + if (mdio_node) {
>> + netdev_dbg(ndev, "FOUND MDIO subnode\n");
>> + } else {
>> + netdev_err(ndev, "NO MDIO subnode\n");
>> + return 0;
>> + }
>> + }
>> +
>> new_bus = mdiobus_alloc();
>> if (new_bus == NULL)
>> return -ENOMEM;
>> @@ -231,7 +250,8 @@ int stmmac_mdio_register(struct net_device *ndev)
>> new_bus->irq = irqlist;
>> new_bus->phy_mask = mdio_bus_data->phy_mask;
>> new_bus->parent = priv->device;
>> - err = mdiobus_register(new_bus);
>> +
>> + err = of_mdiobus_register(new_bus, mdio_node);
>> if (err != 0) {
>> pr_err("%s: Cannot register as MDIO bus\n", new_bus->name);
>> goto bus_register_fail;
>> @@ -284,13 +304,6 @@ int stmmac_mdio_register(struct net_device *ndev)
>> }
>> }
>>
>> - if (!found) {
>> - pr_warn("%s: No PHY found\n", ndev->name);
>> - mdiobus_unregister(new_bus);
>> - mdiobus_free(new_bus);
>> - return -ENODEV;
>> - }
>
> hmm, this could be necessary on some platforms that wants to
> get the phy addr at runtime and in case of failure then
> removes the registered bus.
>
Could make this conditional on (!found && !mdio_node).
Therefore if dt node exists it will be created regardless, otherwise unregister if nothing found.
Thoughts?
>> -
>> priv->mii = new_bus;
>>
>> return 0;
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> index d02691b..6863420 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>> @@ -146,7 +146,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
>> if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
>> dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
>>ec
>> - if (plat->phy_node || plat->phy_bus_name)
>
I think that would be dependent on the device tree.
However this may also work:
if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
> can this breaks some conf case?
>
>> + if (plat->phy_bus_name)
>> plat->mdio_bus_data = NULL;
>> else
>> plat->mdio_bus_data =
>>
Alternatively the solution would be to introduce some non standard device tree node
to force the creation of the mdio bus.
--
Regards
Phil Reid
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