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can: sja1000: of: add reg-io-width property for 8, 16 and 32-bit register access

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Add the 'reg-io-width' property for 8, 16 and 32-bit access, like
what is currently done with IORESOURCE_MEM_{8,16,32}BIT for non-OF
boot.

Signed-off-by: Florian Vaussard <florian.vaussard@epfl.ch>
Tested-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Florian Vaussard 2014-01-31 14:34:37 +01:00 committed by Marc Kleine-Budde
parent 73c90d943e
commit b18ec27c65
1 changed files with 18 additions and 2 deletions
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20
drivers/net/can/sja1000/sja1000_platform.c
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@ -101,8 +101,24 @@ static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of)
int err;
u32 prop;
priv->read_reg = sp_read_reg8;
priv->write_reg = sp_write_reg8;
err = of_property_read_u32(of, "reg-io-width", &prop);
if (err)
prop = 1; /* 8 bit is default */
switch (prop) {
case 4:
priv->read_reg = sp_read_reg32;
priv->write_reg = sp_write_reg32;
break;
case 2:
priv->read_reg = sp_read_reg16;
priv->write_reg = sp_write_reg16;
break;
case 1: /* fallthrough */
default:
priv->read_reg = sp_read_reg8;
priv->write_reg = sp_write_reg8;
}
err = of_property_read_u32(of, "nxp,external-clock-frequency", &prop);
if (!err)