linux-kernel - Re: [RFC PATCH 2/2] Documentation: devictree: Add macb mdio bindings

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Message-ID: <20160513174300.GB7600@lunn.ch>
Date:	Fri, 13 May 2016 19:43:00 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Harini Katakam <harini.katakam@...inx.com>
Cc:	nicolas.ferre@...el.com, davem@...emloft.net, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	harinikatakamlinux@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	harinik@...inx.com, punnaia@...inx.com, michals@...inx.com
Subject: Re: [RFC PATCH 2/2] Documentation: devictree: Add macb mdio bindings

Hi Harini

Is this backward compatible? Will devices using the old binding still
work?

  /* Disable RX and TX (XXX: Should we halt the transmission
   * more gracefully?)
    */
-   macb_writel(bp, NCR, 0);
+   ctrl = macb_readl(bp, NCR);
+   ctrl &= ~(MACB_BIT(RE) | MACB_BIT(TE));
+   macb_writel(bp, NCR, ctrl);
 
	/* Clear the stats registers (XXX: Update stats first?) */
-	macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
+	ctrl |= MACB_BIT(CLRSTAT);
+	macb_writel(bp, NCR, ctrl);
 
	/* Clear all status flags */
 	macb_writel(bp, TSR, -1);

It is not clear to me what this part has to do with MDIO.

   Andrew