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:
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 <wxt@xxxxxxxxxxxxxx>
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
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