linux-kernel - RE: [PATCH v3 4/7] mmc: dw_mmc-pltfm: add Rockchip variant

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Date:	Wed, 12 Jun 2013 10:22:00 +0900
From:	Seungwon Jeon <tgih.jun@...sung.com>
To:	'Heiko Stübner' <heiko@...ech.de>,
	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org,
	'Mike Turquette' <mturquette@...aro.org>,
	'Jaehoon Chung' <jh80.chung@...sung.com>,
	'Chris Ball' <cjb@...top.org>, linux-mmc@...r.kernel.org,
	'Grant Likely' <grant.likely@...aro.org>,
	'Rob Herring' <rob.herring@...xeda.com>,
	'Linus Walleij' <linus.walleij@...aro.org>,
	devicetree-discuss@...ts.ozlabs.org,
	'Russell King' <linux@....linux.org.uk>,
	'Arnd Bergmann' <arnd@...db.de>,
	'Olof Johansson' <olof@...om.net>,
	'Thomas Petazzoni' <thomas.petazzoni@...e-electrons.com>,
	'Andy Shevchenko' <andy.shevchenko@...il.com>
Subject: RE: [PATCH v3 4/7] mmc: dw_mmc-pltfm: add Rockchip variant

Looks good to me.
But this patch has a dependency on '[PATCH 2/2] mmc: dw_mmc: Add support DW SD/MMC driver on SOCFPGA'
After that, it can be applied.(SDMMC_CMD_USE_HOLD_REG should be moved in dw_mmc.h)

Acked-by: Seungwon Jeon <tgih.jun@...sung.com>

Thanks,
Seungwon Jeon

On 06/11/13 2013 8:31 PM Heiko Stübner wrote:
> Cortex-A9 SoCs from Rockchip use a slightly modified variant of dw_mmc
> controllers that seems to require the SDMMC_CMD_USE_HOLD_REG bit to
> always be set.
> 
> There also seem to be no other modifications (additional register etc)
> present, so to keep the footprint low, add this small variant to the
> pltfm driver.
> 
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> ---
>  drivers/mmc/host/dw_mmc-pltfm.c |   21 ++++++++++++++++++++-
>  1 files changed, 20 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
> index 9b05381..cbbbcf3 100644
> --- a/drivers/mmc/host/dw_mmc-pltfm.c
> +++ b/drivers/mmc/host/dw_mmc-pltfm.c
> @@ -24,6 +24,15 @@
> 
>  #include "dw_mmc.h"
> 
> +static void dw_mci_rockchip_prepare_command(struct dw_mci *host, u32 *cmdr)
> +{
> +	*cmdr |= SDMMC_CMD_USE_HOLD_REG;
> +}
> +
> +static const struct dw_mci_drv_data rockchip_drv_data = {
> +	.prepare_command	= dw_mci_rockchip_prepare_command,
> +};
> +
>  int dw_mci_pltfm_register(struct platform_device *pdev,
>  				const struct dw_mci_drv_data *drv_data)
>  {
> @@ -100,13 +109,23 @@ EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops);
> 
>  static const struct of_device_id dw_mci_pltfm_match[] = {
>  	{ .compatible = "snps,dw-mshc", },
> +	{ .compatible = "rockchip,cortex-a9-dw-mshc",
> +		.data = &rockchip_drv_data },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match);
> 
>  static int dw_mci_pltfm_probe(struct platform_device *pdev)
>  {
> -	return dw_mci_pltfm_register(pdev, NULL);
> +	const struct dw_mci_drv_data *drv_data = NULL;
> +	const struct of_device_id *match;
> +
> +	if (pdev->dev.of_node) {
> +		match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node);
> +		drv_data = match->data;
> +	}
> +
> +	return dw_mci_pltfm_register(pdev, drv_data);
>  }
> 
>  int dw_mci_pltfm_remove(struct platform_device *pdev)
> --
> 1.7.2.3
> 
> --
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