serial: sh-sci: Handle GPIO function requests.

This adds initial support for requesting the various GPIO functions
necessary for certain ports. This just plugs in dumb request/free logic,
but serves as a building block for migrating off of the ->init_pins mess
to a wholly gpiolib backed solution (primarily parts with external
RTS/CTS pins, but will also allow us to clean up RXD pin testing).

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h
index 15b1bdcaa9f5..78779074f6e8 100644
--- a/include/linux/serial_sci.h
+++ b/include/linux/serial_sci.h
@@ -64,6 +64,17 @@ enum {
         SCIx_MUX_IRQ = SCIx_NR_IRQS,    /* special case */
 };
 
+/* Offsets into the sci_port->gpios array */
+enum {
+        SCIx_SCK,
+        SCIx_RXD,
+        SCIx_TXD,
+        SCIx_CTS,
+        SCIx_RTS,
+
+        SCIx_NR_FNS,
+};
+
 enum {
         SCIx_PROBE_REGTYPE,
 
@@ -123,6 +134,7 @@ struct plat_sci_port_ops {
 struct plat_sci_port {
         unsigned long   mapbase;                /* resource base */
         unsigned int    irqs[SCIx_NR_IRQS];     /* ERI, RXI, TXI, BRI */
+        unsigned int    gpios[SCIx_NR_FNS];     /* SCK, RXD, TXD, CTS, RTS */
         unsigned int    type;                   /* SCI / SCIF / IRDA */
         upf_t           flags;                  /* UPF_* flags */
         unsigned long   capabilities;           /* Port features/capabilities */