linux-kernel - Re: [PATCH v2 1/6] platform/x86: serial-multi-instantiate: Improve autodetection

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Date:   Sun, 10 Jul 2022 18:14:24 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Mark Gross <markgross@...nel.org>
Subject: Re: [PATCH v2 1/6] platform/x86: serial-multi-instantiate: Improve
 autodetection

Hi,

On 7/9/22 23:16, Andy Shevchenko wrote:
> Instead of calling specific resource counter, let just probe each
> of the type and see what it says. Return -ENOENT if no resources
> found.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Thank you for your patch-series, I've applied the series to my
review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans



> ---
> v2: squashed patch 1, restored behaviour, added comment, dropped message (Hans)
>  .../platform/x86/serial-multi-instantiate.c   | 23 ++++++++++++-------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/platform/x86/serial-multi-instantiate.c b/drivers/platform/x86/serial-multi-instantiate.c
> index 1e8063b7c169..366087a9fce2 100644
> --- a/drivers/platform/x86/serial-multi-instantiate.c
> +++ b/drivers/platform/x86/serial-multi-instantiate.c
> @@ -100,7 +100,7 @@ static int smi_spi_probe(struct platform_device *pdev, struct acpi_device *adev,
>  	if (ret < 0)
>  		return ret;
>  	else if (!ret)
> -		return -ENODEV;
> +		return -ENOENT;
>  
>  	count = ret;
>  
> @@ -184,7 +184,7 @@ static int smi_i2c_probe(struct platform_device *pdev, struct acpi_device *adev,
>  	if (ret < 0)
>  		return ret;
>  	else if (!ret)
> -		return -ENODEV;
> +		return -ENOENT;
>  
>  	count = ret;
>  
> @@ -232,6 +232,7 @@ static int smi_probe(struct platform_device *pdev)
>  	const struct smi_node *node;
>  	struct acpi_device *adev;
>  	struct smi *smi;
> +	int ret;
>  
>  	adev = ACPI_COMPANION(dev);
>  	if (!adev)
> @@ -255,15 +256,21 @@ static int smi_probe(struct platform_device *pdev)
>  	case SMI_SPI:
>  		return smi_spi_probe(pdev, adev, smi, node->instances);
>  	case SMI_AUTO_DETECT:
> -		if (i2c_acpi_client_count(adev) > 0)
> -			return smi_i2c_probe(pdev, adev, smi, node->instances);
> -		else
> -			return smi_spi_probe(pdev, adev, smi, node->instances);
> +		/*
> +		 * For backwards-compatibility with the existing nodes I2C
> +		 * is checked first and if such entries are found ONLY I2C
> +		 * devices are created. Since some existing nodes that were
> +		 * already handled by this driver could also contain unrelated
> +		 * SpiSerialBus nodes that were previously ignored, and this
> +		 * preserves that behavior.
> +		 */
> +		ret = smi_i2c_probe(pdev, adev, smi, node->instances);
> +		if (ret != -ENOENT)
> +			return ret;
> +		return smi_spi_probe(pdev, adev, smi, node->instances);
>  	default:
>  		return -EINVAL;
>  	}
> -
> -	return 0; /* never reached */
>  }
>  
>  static int smi_remove(struct platform_device *pdev)