Re: [PATCH v3 2/2] dmaengine: Consistently define pci_device_ids using named initializers

[Andy Shevchenko]

On Mon, Jul 20, 2026 at 02:03:49PM +0200, Uwe Kleine-König (The Capable Hub) wrote:
> The .driver_data member of the various struct pci_device_id arrays were
> initialized by list expressions. This isn't easily readable if you're
> not into PCI. Using named initializers is more explicit and thus easier
> to parse.
> 
> While touching these arrays, unify the list terminators to be just an
> empty struct with no trailing comma.
> 
> This change doesn't introduce changes to the compiled pci_device_id
> arrays, which was confirmed using x86 and arm64 builds.

...

> +++ b/drivers/dma/dw-edma/dw-edma-pcie.c

>  static const struct pci_device_id dw_edma_pcie_id_table[] = {
>  	{ PCI_DEVICE_DATA(SYNOPSYS, EDDA, &snps_edda_data) },
>  	{ PCI_VDEVICE(XILINX, PCI_DEVICE_ID_XILINX_B054),
> -	  (kernel_ulong_t)&xilinx_mdb_data },
> +	  .driver_data = (kernel_ulong_t)&xilinx_mdb_data },
>  	{ PCI_VDEVICE(XILINX, PCI_DEVICE_ID_XILINX_B00F),
>  	  .driver_data = (kernel_ulong_t)&xilinx_cpm6_dma_data },

It's inconsistent and can use PCI_DEVICE_DATA() in all cases.

>  	{ }

...

> +++ b/drivers/dma/pch_dma.c

>  static const struct pci_device_id pch_dma_id_table[] = {
> -	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_8CH), 8 },
> -	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_4CH), 4 },
> -	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA1_8CH), 8}, /* UART Video */
> -	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA2_8CH), 8}, /* PCMIF SPI */
> -	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA3_4CH), 4}, /* FPGA */
> -	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA4_12CH), 12}, /* I2S */
> -	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA1_4CH), 4}, /* UART */
> -	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA2_4CH), 4}, /* Video SPI */
> -	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA3_4CH), 4}, /* Security */
> -	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA4_4CH), 4}, /* FPGA */
> -	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_DMA1_8CH), 8}, /* UART */
> -	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_DMA2_4CH), 4}, /* SPI */
> -	{ 0, },
> +	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_8CH), .driver_data = 8 },
> +	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_4CH), .driver_data = 4 },
> +	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA1_8CH), .driver_data = 8 },		/* UART Video */
> +	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA2_8CH), .driver_data = 8 },		/* PCMIF SPI */
> +	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA3_4CH), .driver_data = 4 },		/* FPGA */
> +	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA4_12CH), .driver_data = 12 },	/* I2S */
> +	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA1_4CH), .driver_data = 4 },		/* UART */
> +	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA2_4CH), .driver_data = 4 },		/* Video SPI */
> +	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA3_4CH), .driver_data = 4 },		/* Security */
> +	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA4_4CH), .driver_data = 4 },		/* FPGA */
> +	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_DMA1_8CH), .driver_data = 8 },		/* UART */
> +	{ PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_DMA2_4CH), .driver_data = 4 },		/* SPI */
> +	{ }
>  };

And I'm still strongly against this churn, which also makes lines too long.

PCI_DEVICE_DATA() makes it condensed and moves the burden of any future
conversions to the macro without touching users again.

-- 
With Best Regards,
Andy Shevchenko