Hi Sergei,

在 2016年03月16日 21:57, Sergei Shtylyov 写道:

Hello.

On 3/14/2016 11:01 AM, Caesar Wang wrote:

quoted

This patch adds the following property for arc_emac.

1) phy-reset-gpios:
The phy-reset-gpio is an optional property for arc emac device tree 
boot.
Change the binding document to match the driver code.

2) phy-reset-duration:
Different boards may require different phy reset duration. Add property
phy-reset-duration for device tree probe, so that the boards that need
a longer reset duration can specify it in their device tree.

Anyway, we can add the above property for arc emac.

Signed-off-by: Caesar Wang <redacted>

  Could you have a look at drivers/net/ethernet/cadence/macb/? It 
seems to be the only driver which places the PHY's "reset-gpios" prop 
correctly, into the PHY subnode? I'm currently working on adding 
support of this prop into phylib...

I see the driver on now.


     /* Power up the PHY if there is a GPIO reset */
     phy_node =  of_get_next_available_child(np, NULL);
     if (phy_node) {
         int gpio = of_get_named_gpio(phy_node, "reset-gpios", 0);
         if (gpio_is_valid(gpio))
             bp->reset_gpio = gpio_to_desc(gpio);
         gpiod_set_value(bp->reset_gpio, GPIOD_OUT_HIGH);
     }
     of_node_put(phy_node);
...

Frankly, I don't like this way in device drivers.
That's seem same with the /drivers/mmc/core/pwrseq_simple.c,  power up 
the device.
Is it not really reset hardware PHY from the gpio reset pin?  Just power up.

Of course, I hope to see and test it if you improve the PHY framework to 
support the phy reset.:-)

---

Anyway,  David had applied this series patches into net branch.

Although the clock and dts patches should be applied into Heiko branch,  
I'm glad to see David's way.

Heiko branch:
https://git.kernel.org/cgit/linux/kernel/git/mmind/linux-rockchip.git/


I wish won't destory Heiko to merge in the future.


-Caesar

MBR, Sergei


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-- 
Thanks,
Caesar