memory: atmel-ebi: Properly handle multiple reference to the same CS

Some devices are defining several sub-ranges within the same CS iomem
range. In this case, we should not duplicate the EBI device config.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/drivers/memory/atmel-ebi.c b/drivers/memory/atmel-ebi.c
index 2c4c9a1978bc862381a3aca5e4694708345b05da..46657eaaedf682efbb34ff31e65d372456b33faf 100644 (file)
--- a/drivers/memory/atmel-ebi.c
+++ b/drivers/memory/atmel-ebi.c
@@ -449,12 +449,31 @@ static int at91_ebi_dev_setup(struct at91_ebi *ebi, struct device_node *np,
        struct at91_ebi_dev_config conf = { };
        struct device *dev = ebi->dev;
        struct at91_ebi_dev *ebid;
-       int ret, numcs = 0, i;
+       unsigned long cslines = 0;
+       int ret, numcs = 0, nentries, i;
        bool apply = false;
+       u32 cs;
 
-       numcs = of_property_count_elems_of_size(np, "reg",
-                                               reg_cells * sizeof(u32));
-       if (numcs <= 0) {
+       nentries = of_property_count_elems_of_size(np, "reg",
+                                                  reg_cells * sizeof(u32));
+       for (i = 0; i < nentries; i++) {
+               ret = of_property_read_u32_index(np, "reg", i * reg_cells,
+                                                &cs);
+               if (ret)
+                       return ret;
+
+               if (cs >= AT91_MATRIX_EBI_NUM_CS ||
+                   !(ebi->caps->available_cs & BIT(cs))) {
+                       dev_err(dev, "invalid reg property in %s\n",
+                               np->full_name);
+                       return -EINVAL;
+               }
+
+               if (!test_and_set_bit(cs, &cslines))
+                       numcs++;
+       }
+
+       if (!numcs) {
                dev_err(dev, "invalid reg property in %s\n", np->full_name);
                return -EINVAL;
        }
@@ -473,21 +492,8 @@ static int at91_ebi_dev_setup(struct at91_ebi *ebi, struct device_node *np,
        else if (ret)
                apply = true;
 
-       for (i = 0; i < numcs; i++) {
-               u32 cs;
-
-               ret = of_property_read_u32_index(np, "reg", i * reg_cells,
-                                                &cs);
-               if (ret)
-                       return ret;
-
-               if (cs > AT91_MATRIX_EBI_NUM_CS ||
-                   !(ebi->caps->available_cs & BIT(cs))) {
-                       dev_err(dev, "invalid reg property in %s\n",
-                               np->full_name);
-                       return -EINVAL;
-               }
-
+       i = 0;
+       for_each_set_bit(cs, &cslines, AT91_MATRIX_EBI_NUM_CS) {
                ebid->configs[i].cs = cs;
 
                if (apply) {
@@ -506,6 +512,8 @@ static int at91_ebi_dev_setup(struct at91_ebi *ebi, struct device_node *np,
                if (ebi->ebi_csa && apply)
                        regmap_field_update_bits(ebi->ebi_csa,
                                                 BIT(cs), 0);
+
+               i++;
        }
 
        list_add_tail(&ebid->node, &ebi->devs);