The GPMC has wait-pin signals that can be assigned to a chip-select
to monitor the ready signal of an external device. Add a variable to
indicate the total number of wait-pins for a given device. This will
allow us to detect if the wait-pin being selected is valid or not.

When booting with device-tree read the number of wait-pins from the
device-tree blob. When device-tree is not used set the number of
wait-pins to 4 which is valid for OMAP2-5 devices. Newer devices
that have less wait-pins (such as AM335x) only support booting with
device-tree and so hard-coding the wait-pin number when not using
device-tree is fine.

Signed-off-by: Jon Hunter <redacted>
---
 arch/arm/mach-omap2/gpmc.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index ef655d9..88a261c 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c

@@ -108,6 +108,8 @@
 #define	GPMC_HAS_WR_ACCESS		0x1
 #define	GPMC_HAS_WR_DATA_MUX_BUS	0x2
 
+#define GPMC_NR_WAITPINS		4
+
 /* XXX: Only NAND irq has been considered,currently these are the only ones used
  */
 #define	GPMC_NR_IRQ		2

@@ -153,6 +155,7 @@ static struct resource	gpmc_cs_mem[GPMC_CS_NUM];
 static DEFINE_SPINLOCK(gpmc_mem_lock);
 /* Define chip-selects as reserved by default until probe completes */
 static unsigned int gpmc_cs_map = ((1 << GPMC_CS_NUM) - 1);
+static unsigned int gpmc_nr_waitpins;
 static struct device *gpmc_dev;
 static int gpmc_irq;
 static resource_size_t phys_base, mem_size;

@@ -1297,6 +1300,13 @@ static int gpmc_probe_dt(struct platform_device *pdev)
 	if (!of_id)
 		return 0;
 
+	ret = of_property_read_u32(pdev->dev.of_node, "gpmc,num-waitpins",
+				   &gpmc_nr_waitpins);
+	if (ret < 0) {
+		pr_err("%s: number of wait pins not found!\n", __func__);
+		return ret;
+	}
+
 	for_each_node_by_name(child, "nand") {
 		ret = gpmc_probe_nand_child(pdev, child);
 		if (ret < 0) {

@@ -1372,6 +1382,12 @@ static int gpmc_probe(struct platform_device *pdev)
 	if (gpmc_setup_irq() < 0)
 		dev_warn(gpmc_dev, "gpmc_setup_irq failed\n");
 
+	/* Now the GPMC is initialised, unreserve the chip-selects */
+	gpmc_cs_map = 0;