[PATCH net] net: phy: Document phydev::dev_flags bits allocation

Document the phydev::dev_flags bit allocation to allow bits 15:0 to
define PHY driver specific behavior, bits 23:16 to be reserved for now,
and bits 31:24 to hold generic PHY driver flags.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 include/linux/phy.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 60d2b26026a2..852743f07e3e 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h

@@ -496,6 +496,11 @@ struct macsec_ops;
  * @mac_managed_pm: Set true if MAC driver takes of suspending/resuming PHY
  * @state: State of the PHY for management purposes
  * @dev_flags: Device-specific flags used by the PHY driver.
+ *		Bits [15:0] are free to use by the PHY driver to communicate
+ *			    driver specific behavior.
+ *		Bits [23:16] are currently reserved for future use.
+ *		Bits [31:24] are reserved for defining generic
+ *			     PHY driver behavior.
  * @irq: IRQ number of the PHY's interrupt (-1 if none)
  * @phy_timer: The timer for handling the state machine
  * @phylink: Pointer to phylink instance for this PHY

-- 
2.25.1

On Wed, May 26, 2021 at 11:46:17AM -0700, Florian Fainelli wrote:

Document the phydev::dev_flags bit allocation to allow bits 15:0 to
define PHY driver specific behavior, bits 23:16 to be reserved for now,
and bits 31:24 to hold generic PHY driver flags.

Hi Florian

This is good as far as it goes. But do we want to give a hint that if
the MAC driver sets bits in [15:0] it should first verify the PHY has
the ID which is expected?

    Andrew

On Wed, May 26, 2021 at 11:46:17AM -0700, Florian Fainelli wrote:

Document the phydev::dev_flags bit allocation to allow bits 15:0 to
define PHY driver specific behavior, bits 23:16 to be reserved for now,
and bits 31:24 to hold generic PHY driver flags.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Yay!

Reviewed-by: Russell King (Oracle) <redacted>

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On Wed, May 26, 2021 at 08:53:41PM +0200, Andrew Lunn wrote:

On Wed, May 26, 2021 at 11:46:17AM -0700, Florian Fainelli wrote:

quoted

Document the phydev::dev_flags bit allocation to allow bits 15:0 to
define PHY driver specific behavior, bits 23:16 to be reserved for now,
and bits 31:24 to hold generic PHY driver flags.

This is good as far as it goes. But do we want to give a hint that if
the MAC driver sets bits in [15:0] it should first verify the PHY has
the ID which is expected?

Hi Andrew,

I think we probably need a helper for that - while we can match
phydev->phy_id, that only works for C22 PHYs. Matching the C45
IDs is much more painful. So, I think a helper would be good,
even if initially it just checks the C22 ID.

Thoughts?

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Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Wed, 26 May 2021 11:46:17 -0700 you wrote:

Document the phydev::dev_flags bit allocation to allow bits 15:0 to
define PHY driver specific behavior, bits 23:16 to be reserved for now,
and bits 31:24 to hold generic PHY driver flags.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 include/linux/phy.h | 5 +++++
 1 file changed, 5 insertions(+)

Here is the summary with links:
  - [net] net: phy: Document phydev::dev_flags bits allocation
    https://git.kernel.org/netdev/net/c/62f3415db237

You are awesome, thank you!
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