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net: dsa: rework switch parsing 

When parsing a switch, we have to identify to which tree it belongs and
parse its ports. Provide two functions to separate the OF and platform
data specific paths.

Also use the of_property_read_variable_u32_array function to parse the
OF member array instead of calling of_property_read_u32_index twice.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Vivien Didelot 2017-11-03 19:05:27 -04:00 committed by David S. Miller
parent 0eefe2c173
commit 975e6e3221
1 changed files with 58 additions and 59 deletions
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117
net/dsa/dsa2.c
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@ -617,7 +617,8 @@ static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn)
return 0;
}
static int dsa_parse_ports_of(struct device_node *dn, struct dsa_switch *ds)
static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
struct device_node *dn)
{
struct device_node *ports, *port;
struct dsa_port *dp;
@ -648,6 +649,39 @@ static int dsa_parse_ports_of(struct device_node *dn, struct dsa_switch *ds)
return 0;
}
static int dsa_switch_parse_member_of(struct dsa_switch *ds,
struct device_node *dn)
{
u32 m[2] = { 0, 0 };
int sz;
/* Don't error out if this optional property isn't found */
sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2);
if (sz < 0 && sz != -EINVAL)
return sz;
ds->index = m[1];
if (ds->index >= DSA_MAX_SWITCHES)
return -EINVAL;
ds->dst = dsa_tree_touch(m[0]);
if (!ds->dst)
return -ENOMEM;
return 0;
}
static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
{
int err;
err = dsa_switch_parse_member_of(ds, dn);
if (err)
return err;
return dsa_switch_parse_ports_of(ds, dn);
}
static int dsa_port_parse(struct dsa_port *dp, const char *name,
struct device *dev)
{
@ -673,7 +707,8 @@ static int dsa_port_parse(struct dsa_port *dp, const char *name,
return 0;
}
static int dsa_parse_ports(struct dsa_chip_data *cd, struct dsa_switch *ds)
static int dsa_switch_parse_ports(struct dsa_switch *ds,
struct dsa_chip_data *cd)
{
bool valid_name_found = false;
struct dsa_port *dp;
@ -703,40 +738,19 @@ static int dsa_parse_ports(struct dsa_chip_data *cd, struct dsa_switch *ds)
return 0;
}
static int dsa_parse_member_dn(struct device_node *np, u32 *tree, u32 *index)
static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd)
{
int err;
ds->cd = cd;
*tree = *index = 0;
/* We don't support interconnected switches nor multiple trees via
* platform data, so this is the unique switch of the tree.
*/
ds->index = 0;
ds->dst = dsa_tree_touch(0);
if (!ds->dst)
return -ENOMEM;
err = of_property_read_u32_index(np, "dsa,member", 0, tree);
if (err) {
/* Does not exist, but it is optional */
if (err == -EINVAL)
return 0;
return err;
}
err = of_property_read_u32_index(np, "dsa,member", 1, index);
if (err)
return err;
if (*index >= DSA_MAX_SWITCHES)
return -EINVAL;
return 0;
}
static int dsa_parse_member(struct dsa_chip_data *pd, u32 *tree, u32 *index)
{
if (!pd)
return -ENODEV;
/* We do not support complex trees with dsa_chip_data */
*tree = 0;
*index = 0;
return 0;
return dsa_switch_parse_ports(ds, cd);
}
static int _dsa_register_switch(struct dsa_switch *ds)
@ -744,36 +758,21 @@ static int _dsa_register_switch(struct dsa_switch *ds)
struct dsa_chip_data *pdata = ds->dev->platform_data;
struct device_node *np = ds->dev->of_node;
struct dsa_switch_tree *dst;
u32 tree, index;
unsigned int index;
int i, err;
if (np) {
err = dsa_parse_member_dn(np, &tree, &index);
if (err)
return err;
} else {
err = dsa_parse_member(pdata, &tree, &index);
if (err)
return err;
}
if (np)
err = dsa_switch_parse_of(ds, np);
else if (pdata)
err = dsa_switch_parse(ds, pdata);
else
err = -ENODEV;
dst = dsa_tree_touch(tree);
if (!dst)
return -ENOMEM;
if (err)
return err;
ds->dst = dst;
ds->index = index;
ds->cd = pdata;
if (np) {
err = dsa_parse_ports_of(np, ds);
if (err)
return err;
} else {
err = dsa_parse_ports(pdata, ds);
if (err)
return err;
}
index = ds->index;
dst = ds->dst;
/* Initialize the routing table */
for (i = 0; i < DSA_MAX_SWITCHES; ++i)