linux-kernel - Re: [PATCH 4/5] soundwire: qcom: avoid dependency on CONFIG

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Date:   Thu, 27 Aug 2020 21:16:09 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Jonathan Marek <jonathan@...ek.ca>, alsa-devel@...a-project.org
Cc:     Vinod Koul <vkoul@...nel.org>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 4/5] soundwire: qcom: avoid dependency on CONFIG_SLIMBUS

On 08/06/2020 23:43, Jonathan Marek wrote:
> The driver may be used without slimbus, so don't depend on slimbus.
> 
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> ---
>   drivers/soundwire/Kconfig | 1 -
>   drivers/soundwire/qcom.c  | 5 +++++
>   2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soundwire/Kconfig b/drivers/soundwire/Kconfig
> index fa2b4ab92ed9..d121cf739090 100644
> --- a/drivers/soundwire/Kconfig
> +++ b/drivers/soundwire/Kconfig
> @@ -33,7 +33,6 @@ config SOUNDWIRE_INTEL
>   
>   config SOUNDWIRE_QCOM
>   	tristate "Qualcomm SoundWire Master driver"
> -	depends on SLIMBUS

I'd suggest:
depends on SLIMBUS || !SLIMBUS #if SLIMBUS=m, this can not be builtin

This would allow building both SLIMBUS and SOUNDWIRE_QCOM as modules

>   	depends on SND_SOC
>   	help
>   	  SoundWire Qualcomm Master driver.
> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
> index 14334442615f..ac81c64768ea 100644
> --- a/drivers/soundwire/qcom.c
> +++ b/drivers/soundwire/qcom.c
> @@ -769,13 +769,18 @@ static int qcom_swrm_probe(struct platform_device *pdev)
>   	if (!ctrl)
>   		return -ENOMEM;
>   
> +#ifdef CONFIG_SLIMBUS

and then #if IS_ENABLED(CONFIG_SLIBMUS) here

>   	if (dev->parent->bus == &slimbus_bus) {
> +#else
> +	if (false) {
> +#endif
>   		ctrl->reg_read = qcom_swrm_ahb_reg_read;
>   		ctrl->reg_write = qcom_swrm_ahb_reg_write;
>   		ctrl->regmap = dev_get_regmap(dev->parent, NULL);
>   		if (!ctrl->regmap)
>   			return -EINVAL;
>   	} else {
> +
>   		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>   
>   		ctrl->reg_read = qcom_swrm_cpu_reg_read;
> 


-- 
With best wishes
Dmitry