netdev - Re: [PATCH v3 4/5] wifi: brcmfmac: Add optional lpo clock enable support

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Date: Sun, 30 Jun 2024 10:43:06 +0200
From: Stefan Wahren <wahrenst@....net>
To: Jacobe Zang <jacobe.zang@...ion.com>, 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
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
Subject: Re: [PATCH v3 4/5] wifi: brcmfmac: Add optional lpo clock enable
 support

Hi,

Am 30.06.24 um 09:36 schrieb Jacobe Zang:
> WiFi modules often require 32kHz clock to function. Add support to
> enable the clock to PCIe driver.
the low power clock is independent from the host interface like PCIe. So
the clock handling should move to the common code. Sorry, not i cannot
give a good suggestion, what's the best place for this.
>
> 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/pcie.c    | 10 ++++++++++
>   1 file changed, 10 insertions(+)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> index 06698a714b523..e84f562fc91b8 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> @@ -3,6 +3,7 @@
>    * Copyright (c) 2014 Broadcom Corporation
>    */
>
> +#include <linux/clk.h>
>   #include <linux/kernel.h>
>   #include <linux/module.h>
>   #include <linux/firmware.h>
> @@ -2411,6 +2412,7 @@ brcmf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>   	struct brcmf_pciedev *pcie_bus_dev;
>   	struct brcmf_core *core;
>   	struct brcmf_bus *bus;
> +	struct clk *clk;
>
>   	if (!id) {
>   		id = pci_match_id(brcmf_pcie_devid_table, pdev);
> @@ -2422,6 +2424,14 @@ brcmf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>
>   	brcmf_dbg(PCIE, "Enter %x:%x\n", pdev->vendor, pdev->device);
>
> +	clk = devm_clk_get_optional_enabled(&pdev->dev, "lpo");
> +	if (IS_ERR(clk))
> +		return PTR_ERR(clk);
> +	if (clk) {
> +		brcmf_dbg(PCIE, "enabling 32kHz clock\n", pdev->vendor, pdev->device);
> +		clk_set_rate(clk, 32768);
> +	}
> +
>   	ret = -ENOMEM;
>   	devinfo = kzalloc(sizeof(*devinfo), GFP_KERNEL);
>   	if (devinfo == NULL)