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

Jacobe Zang
2024-07-31T06:12:01Z

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@xff.cz>
Signed-off-by: Ondrej Jirman <megi@xff.cz>
Signed-off-by: Jacobe Zang <jacobe.zang@wesion.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