ARM: OMAP2+: Add function to read GPMC settings from device-tree
Adds a function to read the various GPMC chip-select settings from
device-tree and store them in the gpmc_settings structure.
Update the GPMC device-tree binding documentation to describe these
options.
Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index b22771b..85231b3 100644
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -1187,6 +1187,46 @@
};
MODULE_DEVICE_TABLE(of, gpmc_dt_ids);
+/**
+ * gpmc_read_settings_dt - read gpmc settings from device-tree
+ * @np: pointer to device-tree node for a gpmc child device
+ * @p: pointer to gpmc settings structure
+ *
+ * Reads the GPMC settings for a GPMC child device from device-tree and
+ * stores them in the GPMC settings structure passed. The GPMC settings
+ * structure is initialised to zero by this function and so any
+ * previously stored settings will be cleared.
+ */
+void gpmc_read_settings_dt(struct device_node *np, struct gpmc_settings *p)
+{
+ memset(p, 0, sizeof(struct gpmc_settings));
+
+ p->sync_read = of_property_read_bool(np, "gpmc,sync-read");
+ p->sync_write = of_property_read_bool(np, "gpmc,sync-write");
+ p->device_nand = of_property_read_bool(np, "gpmc,device-nand");
+ of_property_read_u32(np, "gpmc,device-width", &p->device_width);
+ of_property_read_u32(np, "gpmc,mux-add-data", &p->mux_add_data);
+
+ if (!of_property_read_u32(np, "gpmc,burst-length", &p->burst_len)) {
+ p->burst_wrap = of_property_read_bool(np, "gpmc,burst-wrap");
+ p->burst_read = of_property_read_bool(np, "gpmc,burst-read");
+ p->burst_write = of_property_read_bool(np, "gpmc,burst-write");
+ if (!p->burst_read && !p->burst_write)
+ pr_warn("%s: page/burst-length set but not used!\n",
+ __func__);
+ }
+
+ if (!of_property_read_u32(np, "gpmc,wait-pin", &p->wait_pin)) {
+ p->wait_on_read = of_property_read_bool(np,
+ "gpmc,wait-on-read");
+ p->wait_on_write = of_property_read_bool(np,
+ "gpmc,wait-on-write");
+ if (!p->wait_on_read && !p->wait_on_write)
+ pr_warn("%s: read/write wait monitoring not enabled!\n",
+ __func__);
+ }
+}
+
static void __maybe_unused gpmc_read_timings_dt(struct device_node *np,
struct gpmc_timings *gpmc_t)
{
