linux-kernel - Re: [PATCH v1 5/5] mfd: intel_quark_i2c_gpio: Reuse BAR definitions for MFD cell indexing

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Message-ID: <20210323092057.GM2916463@dell>
Date:   Tue, 23 Mar 2021 09:20:57 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 5/5] mfd: intel_quark_i2c_gpio: Reuse BAR definitions
 for MFD cell indexing

On Tue, 02 Mar 2021, Andy Shevchenko wrote:

> It's convenient and less error prone to use definitions to address
> different cells in an array. For this purpose we may reuse existing
> BAR definitions.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/mfd/intel_quark_i2c_gpio.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/mfd/intel_quark_i2c_gpio.c b/drivers/mfd/intel_quark_i2c_gpio.c
> index 7af22d1399e1..40871ce34e82 100644
> --- a/drivers/mfd/intel_quark_i2c_gpio.c
> +++ b/drivers/mfd/intel_quark_i2c_gpio.c
> @@ -98,14 +98,6 @@ static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = {
>  };
>  
>  static struct mfd_cell intel_quark_mfd_cells[] = {
> -	{
> -		.id = MFD_GPIO_BAR,
> -		.name = "gpio-dwapb",
> -		.acpi_match = &intel_quark_acpi_match_gpio,
> -		.num_resources = ARRAY_SIZE(intel_quark_gpio_res),
> -		.resources = intel_quark_gpio_res,
> -		.ignore_resource_conflicts = true,
> -	},
>  	{
>  		.id = MFD_I2C_BAR,
>  		.name = "i2c_designware",
> @@ -114,6 +106,14 @@ static struct mfd_cell intel_quark_mfd_cells[] = {
>  		.resources = intel_quark_i2c_res,
>  		.ignore_resource_conflicts = true,
>  	},
> +	{
> +		.id = MFD_GPIO_BAR,
> +		.name = "gpio-dwapb",
> +		.acpi_match = &intel_quark_acpi_match_gpio,
> +		.num_resources = ARRAY_SIZE(intel_quark_gpio_res),
> +		.resources = intel_quark_gpio_res,
> +		.ignore_resource_conflicts = true,
> +	},
>  };

I would make this more explicit.

[MFD_I2C_BAR] = { }

If someone comes along and re-reorders these, it will break.

>  static const struct pci_device_id intel_quark_mfd_ids[] = {
> @@ -245,11 +245,11 @@ static int intel_quark_mfd_probe(struct pci_dev *pdev,
>  	if (ret)
>  		return ret;
>  
> -	ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[1]);
> +	ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[MFD_I2C_BAR]);
>  	if (ret)
>  		goto err_unregister_i2c_clk;
>  
> -	ret = intel_quark_gpio_setup(pdev, &intel_quark_mfd_cells[0]);
> +	ret = intel_quark_gpio_setup(pdev, &intel_quark_mfd_cells[MFD_GPIO_BAR]);
>  	if (ret)
>  		goto err_unregister_i2c_clk;
>  

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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