[PATCH v2 1/5] phy: berlin-sata: Move PHY_BASE into private data struct

On 10/27/2014 01:27 PM, Kishon Vijay Abraham I wrote:

On Saturday 25 October 2014 01:55 AM, Felipe Balbi wrote:

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On Fri, Oct 24, 2014 at 10:14:55PM +0200, Sebastian Hesselbarth wrote:

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On 21.10.2014 11:40, Sebastian Hesselbarth wrote:

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On 10/21/2014 11:33 AM, Kishon Vijay Abraham I wrote:

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On Tuesday 21 October 2014 02:37 PM, Sebastian Hesselbarth wrote:

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Currently, Berlin SATA PHY driver assumes PHY_BASE address being
constant. While this PHY_BASE is correct for BG2Q, older BG2 PHY_BASE
is different. Prepare the driver for BG2 support by moving the phy_base
into private driver data.

Acked-by: Antoine T?nart <redacted>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

...

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---
  drivers/phy/phy-berlin-sata.c | 42
++++++++++++++++++++++++++++--------------
  1 file changed, 28 insertions(+), 14 deletions(-)

diff --git a/drivers/phy/phy-berlin-sata.c

b/drivers/phy/phy-berlin-sata.c
index 69ced52d72aa..9682b0f66177 100644

--- a/drivers/phy/phy-berlin-sata.c
+++ b/drivers/phy/phy-berlin-sata.c

@@ -30,7 +30,7 @@
  #define MBUS_WRITE_REQUEST_SIZE_128    (BIT(2) << 16)
  #define MBUS_READ_REQUEST_SIZE_128    (BIT(2) << 19)

-#define PHY_BASE        0x200
+#define BG2Q_PHY_BASE        0x200

[...]

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+static u32 bg2q_sata_phy_base = BG2Q_PHY_BASE;
+
+static const struct of_device_id phy_berlin_sata_of_match[] = {
+    {
+        .compatible = "marvell,berlin2q-sata-phy",
+        .data = &bg2q_sata_phy_base,

Can't the base directly come from dt?

You are suggesting a "marvell,phy-base-address" property, right?
I have no strong opinion about it, I accept your call (or DT maintainer
ones).

I still have the DT patches for BG2Q queued up for v3.19 (I missed the
arm-soc merge window for v3.18). That means, there has been no release
with the phy binding used and I can rework a little more.

Can you please confirm that you want a DT property for the phy base address,
e.g. marvell,phy-base-address = <{0x200,0x80}> ?

If so, I'd also rename the compatible from berlin2q-sata-phy to more
generic berlin-sata-phy.

I think what Kishon is asking, is why this 0x200 offset isn't already on
reg. so that instead of, e.g.:

	reg = <0x40000000 0x1000>;

you would have:

	reg = <0x40000200 0x1000>;

I had something similar to what Sebastian suggested in mind. I think phy_base
is used for a different reason and can't be directly used in 'reg'.

Kishon,

thanks for the clarification. While the extra marvell,phy-base-address
property basically works and I agree with it, I may have some
_potential_ draw-backs:

The Marvell BSP code (which I have no clue _why_ it does what it does
or if it is required) has some magic writes to "improve" serial signal
quality. I left them out as my HDD was detected with and without them.

Now, if we find that they are required, we have to find a way to make
the PHY driver know about the PHY revision. We'd usually add a
different compatible and deal with it accordingly.

So, not adding the compatible now _may_ just postpone a follow-up patch
for the different PHY setup of BG2 and render the new phy_base property
basically useless.

If you are just unhappy with the "static u32 bg2q_sata_phy_base"
assigned to of_device_id.data, I can convert that to Felipe's proposal.

Sebastian