netdev - [PATCH wireless-next v2 06/12] brcmfmac: of: Fetch Apple properties

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Date:   Mon, 12 Sep 2022 10:53:07 +0100
From:   Russell King (Oracle) <rmk+kernel@...linux.org.uk>
To:     Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>
Cc:     Alyssa Rosenzweig <alyssa@...enzweig.io>, asahi@...ts.linux.dev,
        brcm80211-dev-list.pdl@...adcom.com,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Hector Martin <marcan@...can.st>,
        Jakub Kicinski <kuba@...nel.org>,
        Kalle Valo <kvalo@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Paolo Abeni <pabeni@...hat.com>,
        "Rafa__ Mi__ecki" <zajec5@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        SHA-cyfmac-dev-list@...ineon.com, Sven Peter <sven@...npeter.dev>
Subject: [PATCH wireless-next v2 06/12] brcmfmac: of: Fetch Apple properties

From: Hector Martin <marcan@...can.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.
We map Apple's module codenames to board_types in the form
"apple,<module-instance>".

The mapped board_type is added to the DTS file in that form, 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.

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Hector Martin <marcan@...can.st>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 .../wireless/broadcom/brcm80211/brcmfmac/common.h    |  1 +
 .../net/wireless/broadcom/brcm80211/brcmfmac/of.c    | 12 +++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
index 6c5a22a32a96..aa25abffcc7d 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h
@@ -53,6 +53,7 @@ struct brcmf_mp_device {
 	struct brcmfmac_pd_cc *country_codes;
 	const char	*board_type;
 	unsigned char	mac[ETH_ALEN];
+	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 79388d49c256..a83699de01ec 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
@@ -70,14 +70,24 @@ 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, "brcm,board-type", &prop))
+		settings->board_type = prop;
+
+	if (!of_property_read_string(np, "apple,antenna-sku", &prop))
+		settings->antenna_sku = prop;
+
 	/* 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) {
 		char *board_type;
 		const char *tmp;
 
-- 
2.30.2