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Message-ID: <bd661690-1de8-4030-a209-ef26d3559221@gmx.net>
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)
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