Re: [PATCH net-next v3 2/4] phylib: add reset after clk enable support

Hi Andrew,

On 12/05/2017 06:34 PM, Andrew Lunn wrote:

On Tue, Dec 05, 2017 at 02:25:58PM +0100, Richard Leitner wrote:

quoted

From: Richard Leitner <redacted>

Some PHYs need the refclk to be a continuous clock. Therefore they don't
allow turning it off and on again during operation. Nonetheless such a
clock switching is performed by some ETH drivers (namely FEC [1]) for
power saving reasons. An example for an affected PHY is the
SMSC/Microchip LAN8720 in "REF_CLK In Mode".

In order to provide a uniform method to overcome this problem this patch
adds a new phy_driver flag (PHY_RST_AFTER_CLK_EN) and corresponding
function phy_reset_after_clk_enable() to the phylib. These should be
used to trigger reset of the PHY after the refclk is switched on again.

This patch depends on the "phylib: Add device reset GPIO support" patch
submitted by Geert Uytterhoeven/Sergei Shtylyov [2].

[1] commit e8fcfcd5684a ("net: fec: optimize the clock management to save power")
[2] https://patchwork.kernel.org/patch/10090149/

Signed-off-by: Richard Leitner <redacted>

Hi Richard

Same comment about moving text below the ---

Ok. Thanks for your feedback and review.

Reviewed-by: Andrew Lunn <redacted>

regards;Richard.L

     Andrew

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