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. Change function prototypes from void
to int and add appropriate errno's for return values that will be
send to bus when error occurred.

Co-developed-by: Ondrej Jirman <megi@xff.cz>
Signed-off-by: Ondrej Jirman <megi@xff.cz>
Co-developed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Reviewed-by: Sai Krishna <saikrishnag@marvell.com>
Signed-off-by: Jacobe Zang <jacobe.zang@wesion.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com> # On RK3588 EVB1
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20240910-wireless-mainline-v14-3-9d80fea5326d@wesion.com

drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c

@@ -947,8 +947,8 @@ int brcmf_sdiod_probe(struct brcmf_sdio_dev *sdiodev)
 
 	/* try to attach to the target device */
 	sdiodev->bus = brcmf_sdio_probe(sdiodev);
-	if (!sdiodev->bus) {
+	if (IS_ERR(sdiodev->bus)) {
-		ret = -ENODEV;
+		ret = PTR_ERR(sdiodev->bus);
 		goto out;
 	}
 	brcmf_sdiod_host_fixup(sdiodev->func2->card->host);

drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c

@@ -561,7 +561,8 @@ struct brcmf_mp_device *brcmf_get_module_param(struct device *dev,
 	if (!found) {
 		/* No platform data for this device, try OF and DMI data */
 		brcmf_dmi_probe(settings, chip, chiprev);
-		brcmf_of_probe(dev, bus_type, settings);
+		if (brcmf_of_probe(dev, bus_type, settings) == -EPROBE_DEFER)
+			return ERR_PTR(-EPROBE_DEFER);
 		brcmf_acpi_probe(dev, bus_type, settings);
 	}
 	return settings;

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"
@@ -65,12 +66,13 @@ static int brcmf_of_get_country_codes(struct device *dev,
 	return 0;
 }
 
-void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
+int brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
-		    struct brcmf_mp_device *settings)
+		   struct brcmf_mp_device *settings)
 {
 	struct brcmfmac_sdio_pd *sdio = &settings->bus.sdio;
 	struct device_node *root, *np = dev->of_node;
 	struct of_phandle_args oirq;
+	struct clk *clk;
 	const char *prop;
 	int irq;
 	int err;
@@ -106,7 +108,7 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 		board_type = devm_kstrdup(dev, tmp, GFP_KERNEL);
 		if (!board_type) {
 			of_node_put(root);
-			return;
+			return 0;
 		}
 		strreplace(board_type, '/', '-');
 		settings->board_type = board_type;
@@ -114,8 +116,15 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 		of_node_put(root);
 	}
 
+	clk = devm_clk_get_optional_enabled(dev, "lpo");
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	brcmf_dbg(INFO, "%s LPO clock\n", clk ? "enable" : "no");
+	clk_set_rate(clk, 32768);
+
 	if (!np || !of_device_is_compatible(np, "brcm,bcm4329-fmac"))
-		return;
+		return 0;
 
 	err = brcmf_of_get_country_codes(dev, settings);
 	if (err)
@@ -124,23 +133,25 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 	of_get_mac_address(np, settings->mac);
 
 	if (bus_type != BRCMF_BUSTYPE_SDIO)
-		return;
+		return 0;
 
 	if (of_property_read_u32(np, "brcm,drive-strength", &val) == 0)
 		sdio->drive_strength = val;
 
 	/* make sure there are interrupts defined in the node */
 	if (of_irq_parse_one(np, 0, &oirq))
-		return;
+		return 0;
 
 	irq = irq_create_of_mapping(&oirq);
 	if (!irq) {
 		brcmf_err("interrupt could not be mapped\n");
-		return;
+		return 0;
 	}
 	irqf = irq_get_trigger_type(irq);
 
 	sdio->oob_irq_supported = true;
 	sdio->oob_irq_nr = irq;
 	sdio->oob_irq_flags = irqf;
+
+	return 0;
 }

drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.h

@@ -3,11 +3,12 @@
  * Copyright (c) 2014 Broadcom Corporation
  */
 #ifdef CONFIG_OF
-void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
+int brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
-		    struct brcmf_mp_device *settings);
+		   struct brcmf_mp_device *settings);
 #else
-static void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
+static int brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
-			   struct brcmf_mp_device *settings)
+			  struct brcmf_mp_device *settings)
 {
+	return 0;
 }
 #endif /* CONFIG_OF */

drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c

@@ -2452,6 +2452,9 @@ brcmf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		ret = -ENOMEM;
 		goto fail;
 	}
+	ret = PTR_ERR_OR_ZERO(devinfo->settings);
+	if (ret < 0)
+		goto fail;
 
 	bus = kzalloc(sizeof(*bus), GFP_KERNEL);
 	if (!bus) {

drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c

@@ -3943,7 +3943,7 @@ static const struct brcmf_buscore_ops brcmf_sdio_buscore_ops = {
 	.write32 = brcmf_sdio_buscore_write32,
 };
 
-static bool
+static int
 brcmf_sdio_probe_attach(struct brcmf_sdio *bus)
 {
 	struct brcmf_sdio_dev *sdiodev;
@@ -3953,6 +3953,7 @@ brcmf_sdio_probe_attach(struct brcmf_sdio *bus)
 	u32 reg_val;
 	u32 drivestrength;
 	u32 enum_base;
+	int ret = -EBADE;
 
 	sdiodev = bus->sdiodev;
 	sdio_claim_host(sdiodev->func1);
@@ -4001,8 +4002,9 @@ brcmf_sdio_probe_attach(struct brcmf_sdio *bus)
 						   BRCMF_BUSTYPE_SDIO,
 						   bus->ci->chip,
 						   bus->ci->chiprev);
-	if (!sdiodev->settings) {
+	if (IS_ERR_OR_NULL(sdiodev->settings)) {
 		brcmf_err("Failed to get device parameters\n");
+		ret = PTR_ERR_OR_ZERO(sdiodev->settings);
 		goto fail;
 	}
 	/* platform specific configuration:
@@ -4071,7 +4073,7 @@ brcmf_sdio_probe_attach(struct brcmf_sdio *bus)
 	/* allocate header buffer */
 	bus->hdrbuf = kzalloc(MAX_HDR_READ + bus->head_align, GFP_KERNEL);
 	if (!bus->hdrbuf)
-		return false;
+		return -ENOMEM;
 	/* Locate an appropriately-aligned portion of hdrbuf */
 	bus->rxhdr = (u8 *) roundup((unsigned long)&bus->hdrbuf[0],
 				    bus->head_align);
@@ -4082,11 +4084,11 @@ brcmf_sdio_probe_attach(struct brcmf_sdio *bus)
 	if (bus->poll)
 		bus->pollrate = 1;
 
-	return true;
+	return 0;
 
 fail:
 	sdio_release_host(sdiodev->func1);
-	return false;
+	return ret;
 }
 
 static int
@@ -4451,8 +4453,10 @@ struct brcmf_sdio *brcmf_sdio_probe(struct brcmf_sdio_dev *sdiodev)
 
 	/* Allocate private bus interface state */
 	bus = kzalloc(sizeof(*bus), GFP_ATOMIC);
-	if (!bus)
+	if (!bus) {
+		ret = -ENOMEM;
 		goto fail;
+	}
 
 	bus->sdiodev = sdiodev;
 	sdiodev->bus = bus;
@@ -4467,6 +4471,7 @@ struct brcmf_sdio *brcmf_sdio_probe(struct brcmf_sdio_dev *sdiodev)
 				     dev_name(&sdiodev->func1->dev));
 	if (!wq) {
 		brcmf_err("insufficient memory to create txworkqueue\n");
+		ret = -ENOMEM;
 		goto fail;
 	}
 	brcmf_sdiod_freezer_count(sdiodev);
@@ -4474,7 +4479,8 @@ struct brcmf_sdio *brcmf_sdio_probe(struct brcmf_sdio_dev *sdiodev)
 	bus->brcmf_wq = wq;
 
 	/* attempt to attach to the dongle */
-	if (!(brcmf_sdio_probe_attach(bus))) {
+	ret = brcmf_sdio_probe_attach(bus);
+	if (ret < 0) {
 		brcmf_err("brcmf_sdio_probe_attach failed\n");
 		goto fail;
 	}
@@ -4546,7 +4552,7 @@ struct brcmf_sdio *brcmf_sdio_probe(struct brcmf_sdio_dev *sdiodev)
 
 fail:
 	brcmf_sdio_remove(bus);
-	return NULL;
+	return ERR_PTR(ret);
 }
 
 /* Detach and free everything */

drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c

@@ -1272,6 +1272,9 @@ static int brcmf_usb_probe_cb(struct brcmf_usbdev_info *devinfo,
 		ret = -ENOMEM;
 		goto fail;
 	}
+	ret = PTR_ERR_OR_ZERO(devinfo->settings);
+	if (ret < 0)
+		goto fail;
 
 	if (!brcmf_usb_dlneeded(devinfo)) {
 		ret = brcmf_alloc(devinfo->dev, devinfo->settings);