linux-kernel - Re: [PATCH V2 2/3] dmaengine: qcom_hidma: add support for the new revision

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Date:   Fri, 10 Nov 2017 09:03:18 -0500
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Robin Murphy <robin.murphy@....com>, dmaengine@...r.kernel.org,
        Timur Tabi <timur@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH V2 2/3] dmaengine: qcom_hidma: add support for the new
 revision

+linux-acpi, +Rafael for context

On 11/8/2017 12:51 PM, Robin Murphy wrote:
> Apologies if I wasn't very clear, but what I meant to imply by dropping the of_device_get_match_data() hint was to follow one of the common patterns where you either just have some version token:
> 
>     enum foo_ver {
>         FOO_V1,
>         ...
>     }
> 
>     struct acpi_device_id foo_acpi_ids[] = {
>         { "_FOO0001", FOO_V1 },
>         ...
>     }
> 
>     struct of_device_id foo_of_match[] = {
>         { .compatible = "foo,v1", .data = (void *)FOO_V1 },
>         ...
>     }
> 
>     int foo_probe(struct device *dev) {
>         ...
>         foodev->version = (enum foo_ver)
>                 of_device_get_match_data(&dev->of_node)
>         ...
>     }
> 
>     int foo_reset(struct foodev *foodev) {
>         if (foodev->version == FOO_V1)
>             writel(0, foodev->base + 0x20);
>         else
>             writel(0, foodev->base + 0x30);
>     }

I did post v3 with this approach. However, I could not really find a ACPI function that
returns the driver data very similar to of_device_get_match_data(). The only thing
that is closer is acpi_match_device().

I introduced this new function as part of the v3 series. 

Let me know if I'm missing something.


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.