linux-kernel - Re: [net-next PATCH v3 02/14] net: dsa: qca8k: add LEDs basic support

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Message-ID: <20230315002239.ticvivruobuwcvwz@skbuf>
Date:   Wed, 15 Mar 2023 02:22:39 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, Lee Jones <lee@...nel.org>,
        linux-leds@...r.kernel.org
Subject: Re: [net-next PATCH v3 02/14] net: dsa: qca8k: add LEDs basic support

On Tue, Mar 14, 2023 at 11:15:04AM +0100, Christian Marangi wrote:
> Add LEDs basic support for qca8k Switch Family by adding basic
> brightness_set() support.
> 
> Since these LEDs refelect port status, the default label is set to
> ":port". DT binding should describe the color, function and number of
> the leds using standard LEDs api.
> 
> These LEDs supports only blocking variant of the brightness_set()
> function since they can sleep during access of the switch leds to set
> the brightness.
> 
> While at it add to the qca8k header file each mode defined by the Switch
> Documentation for future use.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>  drivers/net/dsa/qca/Kconfig      |   7 ++
>  drivers/net/dsa/qca/Makefile     |   1 +
>  drivers/net/dsa/qca/qca8k-8xxx.c |   4 +
>  drivers/net/dsa/qca/qca8k-leds.c | 191 +++++++++++++++++++++++++++++++
>  drivers/net/dsa/qca/qca8k.h      |  69 +++++++++++
>  5 files changed, 272 insertions(+)
>  create mode 100644 drivers/net/dsa/qca/qca8k-leds.c
> 
> diff --git a/drivers/net/dsa/qca/Kconfig b/drivers/net/dsa/qca/Kconfig
> index ba339747362c..9ed9d9cf80eb 100644
> --- a/drivers/net/dsa/qca/Kconfig
> +++ b/drivers/net/dsa/qca/Kconfig
> @@ -15,3 +15,10 @@ config NET_DSA_QCA8K
>  	help
>  	  This enables support for the Qualcomm Atheros QCA8K Ethernet
>  	  switch chips.
> +
> +config NET_DSA_QCA8K_LEDS_SUPPORT
> +	bool "Qualcomm Atheros QCA8K Ethernet switch family LEDs support"
> +	depends on NET_DSA_QCA8K
> +	help
> +	  This enabled support for LEDs present on the Qualcomm Atheros
> +	  QCA8K Ethernet switch chips.
> diff --git a/drivers/net/dsa/qca/Makefile b/drivers/net/dsa/qca/Makefile
> index 701f1d199e93..330ae389e489 100644
> --- a/drivers/net/dsa/qca/Makefile
> +++ b/drivers/net/dsa/qca/Makefile
> @@ -2,3 +2,4 @@
>  obj-$(CONFIG_NET_DSA_AR9331)	+= ar9331.o
>  obj-$(CONFIG_NET_DSA_QCA8K)	+= qca8k.o
>  qca8k-y 			+= qca8k-common.o qca8k-8xxx.o
> +obj-$(CONFIG_NET_DSA_QCA8K_LEDS_SUPPORT) += qca8k-leds.o

Isn't this what you want instead?

ifdef CONFIG_NET_DSA_QCA8K_LEDS_SUPPORT
qca8k-y 			+= qca8k-leds.o
endif

you don't want to have to export the qca8k_setup_led_ctrl() symbol...
you want it to be part of the same module AFAIU.

> +/* Leds Support function */
> +#ifdef CONFIG_NET_DSA_QCA8K_LEDS_SUPPORT
> +int qca8k_setup_led_ctrl(struct qca8k_priv *priv);
> +#else
> +static inline int qca8k_setup_led_ctrl(struct qca8k_priv *priv)
> +{
> +	return 0;
> +}
> +#endif

Could there be just a qca8k-leds.h with the function prototypes exported
by qca8k-leds.c?