[PATCH 08/34] brcmfmac: of: Fetch Apple properties

[Hector Martin <marcan@marcan.st>]

On Apple ARM64 platforms, firmware selection requires two properties
that come from system firmware: the module-instance (aka "island", a
codename representing a given hardware platform) and the antenna-sku.

The module-instance is hard-coded in per-board DTS files, while the
antenna-sku is forwarded by our bootloader from the Apple Device Tree
into the FDT. Grab them from the DT so firmware selection can use
them.

The module-instance is used to construct a board_type by prepending it
with "apple,".

Signed-off-by: Hector Martin <marcan@marcan.st>
---
 .../broadcom/brcm80211/brcmfmac/common.h      |  1 +
 .../wireless/broadcom/brcm80211/brcmfmac/of.c | 19 ++++++++++++++++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
index 8b5f49997c8b..d4aa25d646fe 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
@@ -50,6 +50,7 @@ struct brcmf_mp_device {
 	bool		ignore_probe_fail;
 	struct brcmfmac_pd_cc *country_codes;
 	const char	*board_type;
+	const char	*antenna_sku;
 	union {
 		struct brcmfmac_sdio_pd sdio;
 	} bus;
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
index 513c7e6421b2..453a6cda5abb 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
@@ -63,14 +63,31 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 {
 	struct brcmfmac_sdio_pd *sdio = &settings->bus.sdio;
 	struct device_node *root, *np = dev->of_node;
+	const char *prop;
 	int irq;
 	int err;
 	u32 irqf;
 	u32 val;
 
+	/* Apple ARM64 platforms have their own idea of board type, passed in
+	 * via the device tree. They also have an antenna SKU parameter
+	 */
+	if (!of_property_read_string(np, "apple,module-instance", &prop)) {
+		const char *prefix = "apple,";
+		int len = strlen(prefix) + strlen(prop) + 1;
+		char *board_type = devm_kzalloc(dev, len, GFP_KERNEL);
+
+		strscpy(board_type, prefix, len);
+		strlcat(board_type, prop, len);
+		settings->board_type = board_type;
+	}
+
+	if (!of_property_read_string(np, "apple,antenna-sku", &prop))
+		settings->antenna_sku = devm_kstrdup(dev, prop, GFP_KERNEL);
+
 	/* Set board-type to the first string of the machine compatible prop */
 	root = of_find_node_by_path("/");
-	if (root) {
+	if (root && !settings->board_type) {
 		int i, len;
 		char *board_type;
 		const char *tmp;
-- 
2.33.0