From: Richard Leitner <richard.leit...@skidata.com> Sent: Friday, July 07, 2017 5:53 PM >To: Andy Duan <fugang.d...@nxp.com>; robh...@kernel.org; >mark.rutl...@arm.com >Cc: netdev@vger.kernel.org; devicet...@vger.kernel.org; linux- >ker...@vger.kernel.org; d...@g0hl1n.net; Andrew Lunn <and...@lunn.ch> >Subject: Re: [PATCH 2/2] net: ethernet: fsl: add phy reset after clk enable >option > > >On 07/07/2017 09:03 AM, Andy Duan wrote: >> From: Richard Leitner <richard.leit...@skidata.com> Sent: Friday, July >> 07, 2017 1:51 PM >>>> Since it is common issue so long as using the PHY, can you move it >>>> into smsc >>> phy driver like in .smsc_phy_reset() function ? >>>> And get the reset pin from phy dts node. >>> >>> Some more points that come into my mind: >>> - The smsc_phy_reset function is registered as "soft_reset". Would >>> it be OK to use nRST in it? >> >> It is not reasonable. >> >>> - Would it be OK to call the phy_init_hw function from within the >>> smsc_phy_reset? >> >> No, phy_init_hw() already call .drv->soft_reset(). >> >>> - IMHO I'd have to move the reset gpio binding inside the phy node >>> then. Isn't that a pretty big change doing that for all PHYs/FECs? Would it >>> be >"worth" it? >>> >> To make the change to be common, there have big change for phy driver. >> Maybe somebody can give one good suggestion/solution for it. > >Sorry, I don't think I understood everything correctly: > >1. The "phy-reset-gpios" binding should go inside the phy node. This will cause >to *change ALL FEC and PHY drivers*. Correct? > The "phy-reset-gpios" binding should go inside the phy node that is more reasonable. It is better PHY core driver handle phy hw reset.
>2. Add an additonal "hard reset" function to the PHY driver which handles the >"phy-reset-gpios". Correct? > Correct. >3. Who should then trigger the "hard reset" of the PHY? phy_init_hw? The FEC? > >The point is that the LAN8710 is currently not always working correctly, >therefore this small change was proposed. Should we really change all >PHY/FECs only because of this? >Furthermore one problem still remains: The enet_refclk is controlled by the >FEC. How does the PHY recognize when it was disabled/enabled? > Your patch is workaround for the issue. As you pointed out these is a common issue. So we hope to get a better solution to handle these in common code. Andy
