soc: fsl: qe: support fsl,qe-snums property

Add driver support for the newly introduced fsl,qe-snums property.

Conveniently, of_property_read_variable_u8_array does exactly what we
need: If the property fsl,qe-snums is found (and has an allowed size),
the array of values get copied to snums, and the return value is the
number of snums - we cannot assign directly to num_of_snums, since we
need to check whether the return value is negative.

Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Qiang Zhao <qiang.zhao@nxp.com>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Li Yang <leoyang.li@nxp.com>

diff --git a/drivers/soc/fsl/qe/qe.c b/drivers/soc/fsl/qe/qe.c
index 4b44484..1d27187 100644 (file)
--- a/drivers/soc/fsl/qe/qe.c
+++ b/drivers/soc/fsl/qe/qe.c
@@ -283,7 +283,6 @@ EXPORT_SYMBOL(qe_clock_source);
  */
 static void qe_snums_init(void)
 {
-       int i;
        static const u8 snum_init_76[] = {
                0x04, 0x05, 0x0C, 0x0D, 0x14, 0x15, 0x1C, 0x1D,
                0x24, 0x25, 0x2C, 0x2D, 0x34, 0x35, 0x88, 0x89,
@@ -304,7 +303,21 @@ static void qe_snums_init(void)
                0x28, 0x29, 0x38, 0x39, 0x48, 0x49, 0x58, 0x59,
                0x68, 0x69, 0x78, 0x79, 0x80, 0x81,
        };
+       struct device_node *qe;
        const u8 *snum_init;
+       int i;
+
+       bitmap_zero(snum_state, QE_NUM_OF_SNUM);
+       qe = qe_get_device_node();
+       if (qe) {
+               i = of_property_read_variable_u8_array(qe, "fsl,qe-snums",
+                                                      snums, 1, QE_NUM_OF_SNUM);
+               of_node_put(qe);
+               if (i > 0) {
+                       qe_num_of_snum = i;
+                       return;
+               }
+       }
 
        qe_num_of_snum = qe_get_num_of_snums();
 
@@ -313,7 +326,6 @@ static void qe_snums_init(void)
        else
                snum_init = snum_init_46;
 
-       bitmap_zero(snum_state, QE_NUM_OF_SNUM);
        memcpy(snums, snum_init, qe_num_of_snum);
 }