[PATCH v3 0/4] dmaengine: use designated initializers for acpi_device_id

[PATCH v3 0/4] dmaengine: use designated initializers for acpi_device_id

[Pawel Zalewski]

This series is converting lists that contain the acpi_device_id struct,
which is defined in the include/linux/device-id/acpi.h to make use of named
initializers (which they do not use currently). This work is part of the on
going effort in the kernel associated with device-ids [1]

The plan is to convert acpi_device_id::driver_data to have an anonymous
union, similarly to what was introduced for PCI and I2C device ID tables.
The goal is to increase type-safety (most of the existing casts are gone),
to improve readability and to make use intent a bit more clear:

```
union {
	kernel_ulong_t driver_data;
	const void *driver_data_ptr;
}
```

But for that to work all lists containing the structs need to use named
initializers first to avoid triggering -Wmissing-braces. I already have
patches that implement this and touching a lot of kernel subsystmes that
use the acpi_device_id struct and that list keeps on growing. Therefore, 
I have decided to split the series per every subsystem into:
- pre-clean-ups that convert the lists to use named initializers
  (which is this series)
- actual implementations that make some of the modules use the new 
  driver_data_ptr member

That way the task can be fragmented into manageable and independent chunks
of work and makes this effort easier to review.

Tested builds on x86-64 and a64 in Yocto using 7.3-rc2.

[1] https://lore.kernel.org/all/cover.1780048925.git.u.kleine-koenig@baylibre.com/

Signed-off-by: Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>
---
Changes in v3:
- Changed the title tag to dmaengine; added Reviewed-by from V2.
- Link to v2: https://patch.msgid.link/20260907-acpi-dma-v2-0-0ffe4a007992@thegoodpenguin.co.uk

Changes in v2:
- Tidy up messages and wrapped at 75 chars; added Reviewed-bys from V1.
- Link to v1: https://patch.msgid.link/20260904-acpi-dma-v1-0-0fcc63d65d4b@thegoodpenguin.co.uk

To: Viresh Kumar <vireshk@kernel.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Vinod Koul <vkoul@kernel.org>
To: Frank Li <Frank.Li@kernel.org>
To: Binbin Zhou <zhoubinbin@loongson.cn>
To: Sinan Kaya <okaya@kernel.org>
Cc: dmaengine@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org

---
Pawel Zalewski (4):
      dmaengine: dw: use designated initializers for acpi_device_id
      dmaengine: loongson: use named initializers for acpi_device_id
      dmaengine: qcom: use named initializers for acpi_device_id
      dmaengine: xgene-dma: use named initializers for acpi_device_id

 drivers/dma/dw/platform.c                    | 12 ++++++------
 drivers/dma/loongson/loongson2-apb-cmc-dma.c |  4 ++--
 drivers/dma/qcom/hidma.c                     |  8 ++++----
 drivers/dma/xgene-dma.c                      |  4 ++--
 4 files changed, 14 insertions(+), 14 deletions(-)
---
base-commit: df2908090cda368b01ff43709f51890076c56157
change-id: 20260904-acpi-dma-ee1add4bae4e

Best regards,
--  
Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>

[PATCH v3 1/4] dmaengine: dw: use designated initializers for acpi_device_id

[Pawel Zalewski]

Use a named initializer for the acpi_device_id fields which makes the code
more readable and consistent with how lists are initialized in the rest of
the kernel code base.

Signed-off-by: Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
---
 drivers/dma/dw/platform.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
index c63fa52036d7f..5c1c97eb28a4a 100644
--- a/drivers/dma/dw/platform.c
+++ b/drivers/dma/dw/platform.c
@@ -141,14 +141,14 @@ MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
 
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id dw_dma_acpi_id_table[] = {
-	{ "INTL9C60", (kernel_ulong_t)&dw_dma_chip_pdata },
-	{ "80862286", (kernel_ulong_t)&dw_dma_chip_pdata },
-	{ "808622C0", (kernel_ulong_t)&dw_dma_chip_pdata },
+	{ .id = "INTL9C60", .driver_data = (kernel_ulong_t)&dw_dma_chip_pdata },
+	{ .id = "80862286", .driver_data = (kernel_ulong_t)&dw_dma_chip_pdata },
+	{ .id = "808622C0", .driver_data = (kernel_ulong_t)&dw_dma_chip_pdata },
 
 	/* Elkhart Lake iDMA 32-bit (PSE DMA) */
-	{ "80864BB4", (kernel_ulong_t)&xbar_chip_pdata },
-	{ "80864BB5", (kernel_ulong_t)&xbar_chip_pdata },
-	{ "80864BB6", (kernel_ulong_t)&xbar_chip_pdata },
+	{ .id = "80864BB4", .driver_data = (kernel_ulong_t)&xbar_chip_pdata },
+	{ .id = "80864BB5", .driver_data = (kernel_ulong_t)&xbar_chip_pdata },
+	{ .id = "80864BB6", .driver_data = (kernel_ulong_t)&xbar_chip_pdata },
 
 	{ }
 };

-- 
2.43.0

[PATCH v3 2/4] dmaengine: loongson: use named initializers for acpi_device_id

[Pawel Zalewski]

Use a named initializer for the acpi_device_id fields which makes the code
more readable and consistent with how lists are initialized in the rest of
the kernel code base.

Unify the list terminator to have a single space between the brackets and
no trailing comma.

Signed-off-by: Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>
Reviewed-by: Binbin Zhou <zhoubinbin@loongson.cn>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/dma/loongson/loongson2-apb-cmc-dma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/loongson/loongson2-apb-cmc-dma.c b/drivers/dma/loongson/loongson2-apb-cmc-dma.c
index 1c9a542edc859..70880625c6e92 100644
--- a/drivers/dma/loongson/loongson2-apb-cmc-dma.c
+++ b/drivers/dma/loongson/loongson2-apb-cmc-dma.c
@@ -709,8 +709,8 @@ static const struct of_device_id loongson2_cmc_dma_of_match[] = {
 MODULE_DEVICE_TABLE(of, loongson2_cmc_dma_of_match);
 
 static const struct acpi_device_id loongson2_cmc_dma_acpi_match[] = {
-	{ "LOON0014", .driver_data = (kernel_ulong_t)&ls2k3000_cmc_dma_config },
-	{ /* sentinel */ }
+	{ .id = "LOON0014", .driver_data = (kernel_ulong_t)&ls2k3000_cmc_dma_config },
+	{ }
 };
 MODULE_DEVICE_TABLE(acpi, loongson2_cmc_dma_acpi_match);
 

-- 
2.43.0

Re: [PATCH v3 2/4] dmaengine: loongson: use named initializers for acpi_device_id

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] dmaengine: loongson: incomplete unification of list terminators
--

commit 4321a78607f15fa601095e26975f8fbd9cdea572
Author: Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>

dmaengine: loongson: use named initializers for acpi_device_id

Use a named initializer for the acpi_device_id fields which makes the code
more readable and consistent with how lists are initialized in the rest of
the kernel code base.

Unify the list terminator to have a single space between the brackets and
no trailing comma.

> diff --git a/drivers/dma/loongson/loongson2-apb-cmc-dma.c b/drivers/dma/loongson/loongson2-apb-cmc-dma.c
> index 1c9a542edc859..70880625c6e92 100644
> --- a/drivers/dma/loongson/loongson2-apb-cmc-dma.c
> +++ b/drivers/dma/loongson/loongson2-apb-cmc-dma.c
> @@ -709,8 +709,8 @@ static const struct of_device_id loongson2_cmc_dma_of_match[] = {
>  MODULE_DEVICE_TABLE(of, loongson2_cmc_dma_of_match);
>  
>  static const struct acpi_device_id loongson2_cmc_dma_acpi_match[] = {
> -	{ "LOON0014", .driver_data = (kernel_ulong_t)&ls2k3000_cmc_dma_config },
> -	{ /* sentinel */ }
> +	{ .id = "LOON0014", .driver_data = (kernel_ulong_t)&ls2k3000_cmc_dma_config },
> +	{ }

[Severity: Low]
The commit message mentions unifying the list terminator, but does this miss
the OF match table located immediately above?

drivers/dma/loongson/loongson2-apb-cmc-dma.c:
static const struct of_device_id loongson2_cmc_dma_of_match[] = {
	...
	{ .compatible = "loongson,ls2k3000-dma", .data = &ls2k3000_cmc_dma_config },
	{ /* sentinel */ }
};

Should the list terminator here also be updated for consistency?

>  };
>  MODULE_DEVICE_TABLE(acpi, loongson2_cmc_dma_acpi_match);

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260916-acpi-dma-v3-0-0dac05654967@thegoodpenguin.co.uk?part=2

Re: [PATCH v3 2/4] dmaengine: loongson: use named initializers for acpi_device_id

[Frank Li]

On Wed, Sep 16, 2026 at 04:27:55PM +0100, Pawel Zalewski wrote:
> Use a named initializer for the acpi_device_id fields which makes the code
> more readable and consistent with how lists are initialized in the rest of
> the kernel code base.
>
> Unify the list terminator to have a single space between the brackets and
> no trailing comma.
>
> Signed-off-by: Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>
> Reviewed-by: Binbin Zhou <zhoubinbin@loongson.cn>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  drivers/dma/loongson/loongson2-apb-cmc-dma.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/loongson/loongson2-apb-cmc-dma.c b/drivers/dma/loongson/loongson2-apb-cmc-dma.c
> index 1c9a542edc859..70880625c6e92 100644
> --- a/drivers/dma/loongson/loongson2-apb-cmc-dma.c
> +++ b/drivers/dma/loongson/loongson2-apb-cmc-dma.c
> @@ -709,8 +709,8 @@ static const struct of_device_id loongson2_cmc_dma_of_match[] = {
>  MODULE_DEVICE_TABLE(of, loongson2_cmc_dma_of_match);
>
>  static const struct acpi_device_id loongson2_cmc_dma_acpi_match[] = {
> -	{ "LOON0014", .driver_data = (kernel_ulong_t)&ls2k3000_cmc_dma_config },
> -	{ /* sentinel */ }
> +	{ .id = "LOON0014", .driver_data = (kernel_ulong_t)&ls2k3000_cmc_dma_config },
> +	{ }
>  };
>  MODULE_DEVICE_TABLE(acpi, loongson2_cmc_dma_acpi_match);
>
>
> --
> 2.43.0
>

[PATCH v3 3/4] dmaengine: qcom: use named initializers for acpi_device_id

[Pawel Zalewski]

Use a named initializer for the acpi_device_id fields which makes the code
more readable and consistent with how lists are initialized in the rest of
the kernel code base.

Unify the list terminator to have a single space between the brackets and
no trailing comma.

Signed-off-by: Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/dma/qcom/hidma.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c
index c939635be21d..1349066b1544 100644
--- a/drivers/dma/qcom/hidma.c
+++ b/drivers/dma/qcom/hidma.c
@@ -935,10 +935,10 @@ static void hidma_remove(struct platform_device *pdev)
 
 #if IS_ENABLED(CONFIG_ACPI)
 static const struct acpi_device_id hidma_acpi_ids[] = {
-	{"QCOM8061"},
-	{"QCOM8062", HIDMA_MSI_CAP},
-	{"QCOM8063", (HIDMA_MSI_CAP | HIDMA_IDENTITY_CAP)},
-	{},
+	{ .id = "QCOM8061" },
+	{ .id = "QCOM8062", .driver_data = HIDMA_MSI_CAP },
+	{ .id = "QCOM8063", .driver_data = (HIDMA_MSI_CAP | HIDMA_IDENTITY_CAP) },
+	{ }
 };
 MODULE_DEVICE_TABLE(acpi, hidma_acpi_ids);
 #endif

-- 
2.43.0

Re: [PATCH v3 3/4] dmaengine: qcom: use named initializers for acpi_device_id

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] dmaengine: qcom: incomplete named initializer transition in hidma_mgmt.c
--

commit 9a66310e86b837e8fbd5ab6a856a4abdb2bbb6cd
Author: Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>

    dmaengine: qcom: use named initializers for acpi_device_id

    Use a named initializer for the acpi_device_id fields which makes the code
    more readable and consistent with how lists are initialized in the rest of
    the kernel code base. Unify the list terminator to have a single space
    between the brackets and no trailing comma.

> diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c
> index c939635be21d2..1349066b1544d 100644
> --- a/drivers/dma/qcom/hidma.c
> +++ b/drivers/dma/qcom/hidma.c
> @@ -935,10 +935,10 @@ static void hidma_remove(struct platform_device *pdev)
>  
>  #if IS_ENABLED(CONFIG_ACPI)
>  static const struct acpi_device_id hidma_acpi_ids[] = {
> -	{"QCOM8061"},
> -	{"QCOM8062", HIDMA_MSI_CAP},
> -	{"QCOM8063", (HIDMA_MSI_CAP | HIDMA_IDENTITY_CAP)},
> -	{},
> +	{ .id = "QCOM8061" },
> +	{ .id = "QCOM8062", .driver_data = HIDMA_MSI_CAP },
> +	{ .id = "QCOM8063", .driver_data = (HIDMA_MSI_CAP | HIDMA_IDENTITY_CAP) },
> +	{ }
>  };

[Severity: Low]
This isn't a bug, but did this commit miss updating a similar struct in the
same module directory?

drivers/dma/qcom/hidma_mgmt.c:hidma_mgmt_acpi_ids:
static const struct acpi_device_id hidma_mgmt_acpi_ids[] = {
	{"QCOM8060"},
	{},
};

This struct follows the exact same pattern, but was missed by the cleanup,
leading to inconsistent coding styles within the same directory.

>  MODULE_DEVICE_TABLE(acpi, hidma_acpi_ids);
>  #endif

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260916-acpi-dma-v3-0-0dac05654967@thegoodpenguin.co.uk?part=3

Re: [PATCH v3 3/4] dmaengine: qcom: use named initializers for acpi_device_id

[Frank Li]

On Wed, Sep 16, 2026 at 04:27:56PM +0100, Pawel Zalewski wrote:
> Use a named initializer for the acpi_device_id fields which makes the code
> more readable and consistent with how lists are initialized in the rest of
> the kernel code base.
>
> Unify the list terminator to have a single space between the brackets and
> no trailing comma.
>
> Signed-off-by: Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  drivers/dma/qcom/hidma.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c
> index c939635be21d..1349066b1544 100644
> --- a/drivers/dma/qcom/hidma.c
> +++ b/drivers/dma/qcom/hidma.c
> @@ -935,10 +935,10 @@ static void hidma_remove(struct platform_device *pdev)
>
>  #if IS_ENABLED(CONFIG_ACPI)
>  static const struct acpi_device_id hidma_acpi_ids[] = {
> -	{"QCOM8061"},
> -	{"QCOM8062", HIDMA_MSI_CAP},
> -	{"QCOM8063", (HIDMA_MSI_CAP | HIDMA_IDENTITY_CAP)},
> -	{},
> +	{ .id = "QCOM8061" },
> +	{ .id = "QCOM8062", .driver_data = HIDMA_MSI_CAP },
> +	{ .id = "QCOM8063", .driver_data = (HIDMA_MSI_CAP | HIDMA_IDENTITY_CAP) },
> +	{ }
>  };
>  MODULE_DEVICE_TABLE(acpi, hidma_acpi_ids);
>  #endif
>
> --
> 2.43.0
>

[PATCH v3 4/4] dmaengine: xgene-dma: use named initializers for acpi_device_id

[Pawel Zalewski]

Use a designated initializer for the acpi_device_id fields which makes the
code more readable and consistent with how lists are initialized in the
rest of the kernel code base. Also drop explicitly setting fields to 0
where it is redundant.

Unify the list terminator to have a single space between the brackets and
no trailing comma.

Signed-off-by: Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/dma/xgene-dma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
index fa1173e49900..8d1c58ca0d48 100644
--- a/drivers/dma/xgene-dma.c
+++ b/drivers/dma/xgene-dma.c
@@ -1800,8 +1800,8 @@ static void xgene_dma_remove(struct platform_device *pdev)
 
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id xgene_dma_acpi_match_ptr[] = {
-	{"APMC0D43", 0},
-	{},
+	{ .id = "APMC0D43" },
+	{ }
 };
 MODULE_DEVICE_TABLE(acpi, xgene_dma_acpi_match_ptr);
 #endif

-- 
2.43.0

Re: [PATCH v3 4/4] dmaengine: xgene-dma: use named initializers for acpi_device_id

[Frank Li]

On Wed, Sep 16, 2026 at 04:27:57PM +0100, Pawel Zalewski wrote:
> Use a designated initializer for the acpi_device_id fields which makes the
> code more readable and consistent with how lists are initialized in the
> rest of the kernel code base. Also drop explicitly setting fields to 0
> where it is redundant.
>
> Unify the list terminator to have a single space between the brackets and
> no trailing comma.
>
> Signed-off-by: Pawel Zalewski <pzalewski@thegoodpenguin.co.uk>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  drivers/dma/xgene-dma.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
> index fa1173e49900..8d1c58ca0d48 100644
> --- a/drivers/dma/xgene-dma.c
> +++ b/drivers/dma/xgene-dma.c
> @@ -1800,8 +1800,8 @@ static void xgene_dma_remove(struct platform_device *pdev)
>
>  #ifdef CONFIG_ACPI
>  static const struct acpi_device_id xgene_dma_acpi_match_ptr[] = {
> -	{"APMC0D43", 0},
> -	{},
> +	{ .id = "APMC0D43" },
> +	{ }
>  };
>  MODULE_DEVICE_TABLE(acpi, xgene_dma_acpi_match_ptr);
>  #endif
>
> --
> 2.43.0
>

Re: [PATCH v3 0/4] dmaengine: use designated initializers for acpi_device_id

[Vinod Koul]

On Wed, 16 Sep 2026 16:27:53 +0100, Pawel Zalewski wrote:
> This series is converting lists that contain the acpi_device_id struct,
> which is defined in the include/linux/device-id/acpi.h to make use of named
> initializers (which they do not use currently). This work is part of the on
> going effort in the kernel associated with device-ids [1]
> 
> The plan is to convert acpi_device_id::driver_data to have an anonymous
> union, similarly to what was introduced for PCI and I2C device ID tables.
> The goal is to increase type-safety (most of the existing casts are gone),
> to improve readability and to make use intent a bit more clear:
> 
> [...]

Applied, thanks!

[1/4] dmaengine: dw: use designated initializers for acpi_device_id
      commit: 3a03a5866e82027c0fa96f6208721397e5a6ff78
[2/4] dmaengine: loongson: use named initializers for acpi_device_id
      commit: b37c93bc1cfd0f5fb898b7943bd0c1797341a41d
[3/4] dmaengine: qcom: use named initializers for acpi_device_id
      commit: db09763394959442d91d86840717412073c41abc
[4/4] dmaengine: xgene-dma: use named initializers for acpi_device_id
      commit: b2c203a5878b0d3f95e4802fa01e320d317b82cf

Best regards,
-- 
~Vinod