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

Andrew Lunn
2017-12-05T17:34:22Z

On Tue, Dec 05, 2017 at 02:25:58PM +0100, Richard Leitner wrote:
> From: Richard Leitner <richard.leitner@skidata.com>
>
> 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 <richard.leitner@skidata.com>

Hi Richard

Same comment about moving text below the ---

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

Andrew