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

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Message-ID: <fb9947fa-bca8-4c51-9feb-bf7ac6c6cc22@broadcom.com>
Date: Sat, 10 Aug 2024 20:32:42 +0200
From: Arend van Spriel <arend.vanspriel@...adcom.com>
To: jacobe.zang@...ion.com, Sai Krishna Gajula <saikrishnag@...vell.com>,
 "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
 <krzk+dt@...nel.org>, "heiko@...ech.de" <heiko@...ech.de>,
 "kvalo@...nel.org" <kvalo@...nel.org>,
 "davem@...emloft.net" <davem@...emloft.net>,
 "edumazet@...gle.com" <edumazet@...gle.com>,
 "kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com"
 <pabeni@...hat.com>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
 "efectn@...tonmail.com" <efectn@...tonmail.com>,
 "dsimic@...jaro.org" <dsimic@...jaro.org>,
 "jagan@...eble.ai" <jagan@...eble.ai>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "linux-rockchip@...ts.infradead.org" <linux-rockchip@...ts.infradead.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "arend@...adcom.com" <arend@...adcom.com>,
 "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "megi@....cz"
 <megi@....cz>, "duoming@....edu.cn" <duoming@....edu.cn>,
 "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
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Subject: Re: [PATCH v9 4/5] wifi: brcmfmac: Add optional lpo clock enable
 support

On 8/10/2024 12:08 PM, jacobe.zang@...ion.com wrote:
> 
> 
> On 2024/8/10 17:44, Sai Krishna Gajula <saikrishnag@...vell.com> wrote:
>>
>> > -----Original Message-----
>> > From: Jacobe Zang <jacobe.zang@...ion.com>
>> > Sent: Saturday, August 10, 2024 9:22 AM
>> > To: 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;
>> > arend.vanspriel@...adcom.com
>> > 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; Jacobe Zang
>> > <jacobe.zang@...ion.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@....cz>
>> > Signed-off-by: Ondrej Jirman <megi@....cz>
>> > Co-developed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
>> > Signed-off-by: Arend van Spriel <arend.vanspriel@...adcom.com>
>> > Signed-off-by: Jacobe Zang <jacobe.zang@...ion.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.

Regards,
Arend