linux-kernel - Re: [PATCH 2/3] dmaengine: qcom_hidma: add support for the new revision

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Date:   Mon, 6 Nov 2017 18:03:16 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Sinan Kaya <okaya@...eaurora.org>, dmaengine@...r.kernel.org,
        timur@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] dmaengine: qcom_hidma: add support for the new
 revision

On 06/11/17 17:26, Sinan Kaya wrote:
> Add support for probing the newer HW.
> 
> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
> ---
>  drivers/dma/qcom/hidma.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c
> index e366985..29d6aaa 100644
> --- a/drivers/dma/qcom/hidma.c
> +++ b/drivers/dma/qcom/hidma.c
> @@ -749,9 +749,13 @@ static bool hidma_msi_capable(struct device *dev)
>  			return false;
>  
>  		ret = strcmp(of_compat, "qcom,hidma-1.1");
> +		if (ret)
> +			ret = strcmp(of_compat, "qcom,hidma-1.2");
>  	} else {
>  #ifdef CONFIG_ACPI
>  		ret = strcmp(acpi_device_hid(adev), "QCOM8062");
> +		if (ret)
> +			ret = strcmp(acpi_device_hid(adev), "QCOM8063");

This string-juggling looks to have already hit the point at which it
doesn't scale well - it would be a lot nicer to make use of
of_device_get_match_data() and the ACPI equivalent to abstract the
version-specific data appropriately.

Robin.

>  #endif
>  	}
>  	return ret == 0;
> @@ -954,6 +958,7 @@ static int hidma_remove(struct platform_device *pdev)
>  static const struct acpi_device_id hidma_acpi_ids[] = {
>  	{"QCOM8061"},
>  	{"QCOM8062"},
> +	{"QCOM8063"},
>  	{},
>  };
>  MODULE_DEVICE_TABLE(acpi, hidma_acpi_ids);
> @@ -962,6 +967,7 @@ static int hidma_remove(struct platform_device *pdev)
>  static const struct of_device_id hidma_match[] = {
>  	{.compatible = "qcom,hidma-1.0",},
>  	{.compatible = "qcom,hidma-1.1",},
> +	{.compatible = "qcom,hidma-1.2",},
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, hidma_match);
>