linux-kernel - [PATCH v6 4/5] wifi: brcmfmac: Add optional lpo clock enable support

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Message-Id: <20240731061132.703368-5-jacobe.zang@wesion.com>
Date: Wed, 31 Jul 2024 14:11:31 +0800
From: Jacobe Zang <jacobe.zang@...ion.com>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	heiko@...ech.de,
	kvalo@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	conor+dt@...nel.org,
	arend.vanspriel@...adcom.com
Cc: efectn@...tonmail.com,
	dsimic@...jaro.org,
	jagan@...eble.ai,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	arend@...adcom.com,
	linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org,
	megi@....cz,
	duoming@....edu.cn,
	bhelgaas@...gle.com,
	minipli@...ecurity.net,
	brcm80211@...ts.linux.dev,
	brcm80211-dev-list.pdl@...adcom.com,
	nick@...das.com,
	Jacobe Zang <jacobe.zang@...ion.com>
Subject: [PATCH v6 4/5] wifi: brcmfmac: Add optional lpo clock enable support

WiFi modules often require 32kHz clock to function. Add support to
enable the clock to PCIe driver and move "brcm,bcm4329-fmac" check
to the top of brcmf_of_probe

Co-developed-by: Ondrej Jirman <megi@....cz>
Signed-off-by: Ondrej Jirman <megi@....cz>
Signed-off-by: Jacobe Zang <jacobe.zang@...ion.com>
---
 .../net/wireless/broadcom/brcm80211/brcmfmac/of.c    | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
index e406e11481a62..7e0a2ad5c7c8a 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
@@ -6,6 +6,7 @@
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/of_net.h>
+#include <linux/clk.h>
 
 #include <defs.h>
 #include "debug.h"
@@ -70,12 +71,16 @@ 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;
+	struct clk *clk;
 	const char *prop;
 	int irq;
 	int err;
 	u32 irqf;
 	u32 val;
 
+	if (!np || !of_device_is_compatible(np, "brcm,bcm4329-fmac"))
+		return;
+
 	/* Apple ARM64 platforms have their own idea of board type, passed in
 	 * via the device tree. They also have an antenna SKU parameter
 	 */
@@ -113,8 +118,13 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 		of_node_put(root);
 	}
 
-	if (!np || !of_device_is_compatible(np, "brcm,bcm4329-fmac"))
+	clk = devm_clk_get_optional_enabled(dev, "lpo");
+	if (!IS_ERR_OR_NULL(clk)) {
+		brcmf_dbg(INFO, "enabling 32kHz clock\n");
+		clk_set_rate(clk, 32768);
+	} else {
 		return;
+	}
 
 	err = brcmf_of_get_country_codes(dev, settings);
 	if (err)
-- 
2.34.1