spi: sh-msiof: Improve bindings

Documentation:
  - Add missing "interrupt-parent", "#address-cells", "#size-cells", and
    "clocks" properties,
  - Add missing default values for "num-cs", "renesas,tx-fifo-size" and
    "renesas,rx-fifo-size",
  - Add a reference to the pinctrl documentation.

Implementation:
  - As "num-cs" is marked optional, provide a sensible default.

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Mark Brown <broonie@linaro.org>

2 files changed, 18 insertions, 8 deletions

diff --git a/Documentation/devicetree/bindings/spi/sh-msiof.txt b/Documentation/devicetree/bindings/spi/sh-msiof.txt
index e6222106ca36..eae3c8c9300e 100644
--- a/Documentation/devicetree/bindings/spi/sh-msiof.txt
+++ b/Documentation/devicetree/bindings/spi/sh-msiof.txt
@@ -1,12 +1,22 @@
 Renesas MSIOF spi controller
 
 Required properties:
-- compatible :  "renesas,sh-msiof" for SuperH or
-                "renesas,sh-mobile-msiof" for SH Mobile series
-- reg : Offset and length of the register set for the device
-- interrupts : interrupt line used by MSIOF
+- compatible           : "renesas,sh-msiof" for SuperH, or
+                         "renesas,sh-mobile-msiof" for SH Mobile series.
+- reg                  : Offset and length of the register set for the device
+- interrupt-parent     : The phandle for the interrupt controller that
+                         services interrupts for this device
+- interrupts           : Interrupt specifier
+- #address-cells       : Must be <1>
+- #size-cells          : Must be <0>
 
 Optional properties:
-- num-cs                : total number of chip-selects
-- renesas,tx-fifo-size  : Overrides the default tx fifo size given in words
-- renesas,rx-fifo-size  : Overrides the default rx fifo size given in words
+- clocks               : Must contain a reference to the functional clock.
+- num-cs               : Total number of chip-selects (default is 1)
+- renesas,tx-fifo-size : Overrides the default tx fifo size given in words
+                         (default is 64)
+- renesas,rx-fifo-size : Overrides the default rx fifo size given in words
+                         (default is 64)
+
+Pinctrl properties might be needed, too.  See
+Documentation/devicetree/bindings/pinctrl/renesas,*.
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 6e2ba62ceb63..181efd049d12 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -664,7 +664,7 @@ static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
 {
         struct sh_msiof_spi_info *info;
         struct device_node *np = dev->of_node;
-        u32 num_cs = 0;
+        u32 num_cs = 1;
 
         info = devm_kzalloc(dev, sizeof(struct sh_msiof_spi_info), GFP_KERNEL);
         if (!info) {