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Date: Fri, 23 Aug 2013 00:01:56 +0200 From: Anatolij Gustschin <agust@...x.de> To: Wolfgang Grandegger <wg@...ndegger.com>, Marc Kleine-Budde <mkl@...gutronix.de> Cc: Gerhard Sittig <gsi@...x.de>, linux-can@...r.kernel.org, netdev@...r.kernel.org Subject: [PATCH next 1/2] net: can: mscan: add a comment on reg to idx mapping From: Gerhard Sittig <gsi@...x.de> add a comment about the magic of deriving an MSCAN component index from the peripheral's physical address / register offset Cc: linux-can@...r.kernel.org Cc: netdev@...r.kernel.org Signed-off-by: Gerhard Sittig <gsi@...x.de> --- drivers/net/can/mscan/mpc5xxx_can.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/mscan/mpc5xxx_can.c b/drivers/net/can/mscan/mpc5xxx_can.c index 5b0ee8e..bc422ba 100644 --- a/drivers/net/can/mscan/mpc5xxx_can.c +++ b/drivers/net/can/mscan/mpc5xxx_can.c @@ -148,7 +148,10 @@ static u32 mpc512x_can_get_clock(struct platform_device *ofdev, goto exit_put; } - /* Determine the MSCAN device index from the physical address */ + /* Determine the MSCAN device index from the peripheral's + * physical address. Register address offsets against the + * IMMR base are: 0x1300, 0x1380, 0x2300, 0x2380 + */ pval = of_get_property(ofdev->dev.of_node, "reg", &plen); BUG_ON(!pval || plen < sizeof(*pval)); clockidx = (*pval & 0x80) ? 1 : 0; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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