[PATCH v9 4/5] wifi: brcmfmac: Add optional lpo clock enable support

[Kalle Valo]

Arend van Spriel <arend.vanspriel at broadcom.com> writes:

> On 8/10/2024 12:08 PM, jacobe.zang at wesion.com wrote:
>
>> On 2024/8/10 17:44, Sai Krishna Gajula <saikrishnag at marvell.com>
>> wrote:
>>>
>>> > -----Original Message-----
>>> > From: Jacobe Zang <jacobe.zang at wesion.com>
>>> > Sent: Saturday, August 10, 2024 9:22 AM
>>> > To: robh at kernel.org; krzk+dt at kernel.org; heiko at sntech.de;
>>> > kvalo at kernel.org; davem at davemloft.net; edumazet at google.com;
>>> > kuba at kernel.org; pabeni at redhat.com; conor+dt at kernel.org;
>>> > arend.vanspriel at broadcom.com
>>> > Cc: efectn at protonmail.com; dsimic at manjaro.org; jagan at edgeble.ai;
>>> > devicetree at vger.kernel.org; linux-arm-kernel at lists.infradead.org;
>>> linux-
>>> > rockchip at lists.infradead.org; linux-kernel at vger.kernel.org;
>>> > arend at broadcom.com; linux-wireless at vger.kernel.org;
>>> > netdev at vger.kernel.org; megi at xff.cz; duoming at zju.edu.cn;
>>> > bhelgaas at google.com; minipli at grsecurity.net; brcm80211 at lists.linux.dev;
>>> > brcm80211-dev-list.pdl at broadcom.com; nick at khadas.com; Jacobe Zang
>>> > <jacobe.zang at wesion.com>
>>> > Subject:  [PATCH v9 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. Change function prototypes from void to int and add
>>> > appropriate errno's for return
>>> > 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 at xff.cz>
>>> > Signed-off-by: Ondrej Jirman <megi at xff.cz>
>>> > Co-developed-by: Arend van Spriel <arend.vanspriel at broadcom.com>
>>> > Signed-off-by: Arend van Spriel <arend.vanspriel at broadcom.com>
>>> > Signed-off-by: Jacobe Zang <jacobe.zang at wesion.com>
>>> > ---
>>> >   .../broadcom/brcm80211/brcmfmac/bcmsdh.c      |  4 +-
>>> >   .../broadcom/brcm80211/brcmfmac/common.c      |  3 +-
>>> >   .../wireless/broadcom/brcm80211/brcmfmac/of.c | 53
>>> +++++++++++--------
>>> > .../wireless/broadcom/brcm80211/brcmfmac/of.h |  9 ++--
>>> >   .../broadcom/brcm80211/brcmfmac/pcie.c        |  3 ++
>>> >   .../broadcom/brcm80211/brcmfmac/sdio.c        | 24 ++++++---
>>> >   .../broadcom/brcm80211/brcmfmac/usb.c         |  3 ++
>>> >   7 files changed, 63 insertions(+), 36 deletions(-)
>>> >
>>> > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
>>> > b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
>>> > index 13391c2d82aae..b2ede4e579c5c 100644
>>> > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
>>> > +++ b/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) {
>>> > -        ret = -ENODEV;
>>> > +    if (IS_ERR(sdiodev->bus)) {
>>> > +        ret = PTR_ERR(sdiodev->bus);
>>> >           goto out;
>>> >       }
>>> >       brcmf_sdiod_host_fixup(sdiodev->func2->card->host);
>>> > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
>>> > b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
>>> > index b24faae35873d..58d50918dd177 100644
>>> > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
>>> > +++ b/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;
>>> > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
>>> > b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
>>> > index e406e11481a62..f19dc7355e0e8 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"
>>> > @@ -65,17 +66,21 @@ 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,
>>> > -            struct brcmf_mp_device *settings)
>>> > +int brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
>>> > +           struct brcmf_mp_device *settings)
>>> >   {
>>> >       struct brcmfmac_sdio_pd *sdio = &settings->bus.sdio;
>>> >       struct device_node *root, *np = dev->of_node;
>>> > +    struct clk *clk;
>>> >       const char *prop;
>>>
>>> Small nit, please check if reverse x-mas tree order need to be
>>> follow here.
>>>
>>> >       int irq;
>>> >       int err;
>>> >       u32 irqf;
>> It can be seen from this line that there should be no need to follow
>> the reverse x-mas tree order. Because it is a struct variable, so
>> place with other struct ones.
>
> As driver maintainer I do not care about such neatness, but maybe
> Kalle has another preference. The code above looks fine to me.

We haven't been strongly requiring reverse x-mas tree in wireless code,
it has been just a preference. Also for me the code above looks fine.

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