linux-kernel - RE: [PATCH v3] mmc: dw_mmc: Add MSHC compatible for Exynos4412

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Message-id: <000501ce0e8a$91ef7c30$b5ce7490$%jun@samsung.com>
Date:	Tue, 19 Feb 2013 19:19:15 +0900
From:	Seungwon Jeon <tgih.jun@...sung.com>
To:	'Dongjin Kim' <tobetter@...il.com>,
	"'unlisted-recipients:'"@samsung.com,
	"'no To-header on input'"@samsung.com
Cc:	'Jaehoon Chung' <jh80.chung@...sung.com>,
	'Sachin Kamat' <sachin.kamat@...aro.org>,
	'Chris Ball' <cjb@...top.org>, 'Arnd Bergmann' <arnd@...db.de>,
	'Thomas Abraham' <thomas.abraham@...aro.org>,
	'Will Newton' <will.newton@...tec.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: RE: [PATCH v3] mmc: dw_mmc: Add MSHC compatible for Exynos4412

On Tuesday, February 19, 2013, Dongjin Kim wrote:
> This patch adds the compatible string for MSHC controller of Exynos4412, and
> share the controller specific properties with Exynos5250 since they have same
> features. Its driver data name is changed to exynos_drv_data instead SoC
> specific name.

It's not actually same.
Exynos4412 doesn't have forward compatibilities for Exynos5250.
I agree that functionality of exynos_drv_data is common.
These functions have been implemented for existing Exynos*.
But in case of caps, it can't applied completely.
I'm concerning about this.

Thanks,
Seungwon Jeon
> 
> Cc: Jaehoon Chung <jh80.chung@...sung.com>
> Cc: Sachin Kamat <sachin.kamat@...aro.org>
> Signed-off-by: Dongjin Kim <tobetter@...il.com>
> ---
>  drivers/mmc/host/dw_mmc-exynos.c |   12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
> index 4d50da6..38cd03c 100644
> --- a/drivers/mmc/host/dw_mmc-exynos.c
> +++ b/drivers/mmc/host/dw_mmc-exynos.c
> @@ -199,8 +199,8 @@ static int dw_mci_exynos_setup_bus(struct dw_mci *host,
>  	return 0;
>  }
> 
> -/* Exynos5250 controller specific capabilities */
> -static unsigned long exynos5250_dwmmc_caps[4] = {
> +/* Exynos4412/Exynos5250 controller specific capabilities */
> +static unsigned long exynos_dwmmc_caps[4] = {
>  	MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR |
>  		MMC_CAP_8_BIT_DATA | MMC_CAP_CMD23,
>  	MMC_CAP_CMD23,
> @@ -208,8 +208,8 @@ static unsigned long exynos5250_dwmmc_caps[4] = {
>  	MMC_CAP_CMD23,
>  };
> 
> -static const struct dw_mci_drv_data exynos5250_drv_data = {
> -	.caps			= exynos5250_dwmmc_caps,
> +static const struct dw_mci_drv_data exynos_drv_data = {
> +	.caps			= exynos_dwmmc_caps,
>  	.init			= dw_mci_exynos_priv_init,
>  	.setup_clock		= dw_mci_exynos_setup_clock,
>  	.prepare_command	= dw_mci_exynos_prepare_command,
> @@ -219,8 +219,10 @@ static const struct dw_mci_drv_data exynos5250_drv_data = {
>  };
> 
>  static const struct of_device_id dw_mci_exynos_match[] = {
> +	{ .compatible = "samsung,exynos4412-dw-mshc",
> +			.data = &exynos_drv_data, },
>  	{ .compatible = "samsung,exynos5250-dw-mshc",
> -			.data = &exynos5250_drv_data, },
> +			.data = &exynos_drv_data, },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, dw_mci_exynos_match);
> --
> 1.7.10.4
> 
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