mmc: sh_mobile_sdhi: add a callback for board specific init code

Some boards need a preliminary setup stage to prepare the sdhi
controller.

Signed-off-by: Bastian Hecht <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

drivers/mmc/host/sh_mobile_sdhi.c

···
 	mmc_data = &priv->mmc_data;
 	p->pdata = mmc_data;
 
+	if (p->init) {
+		ret = p->init(pdev);
+		if (ret)
+			goto einit;
+	}
+
 	snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
 	priv->clk = clk_get(&pdev->dev, clk_name);
 	if (IS_ERR(priv->clk)) {
···
 eprobe:
 	clk_put(priv->clk);
 eclkget:
+	if (p->cleanup)
+		p->cleanup(pdev);
+einit:
 	kfree(priv);
 	return ret;
 }
···
 	}
 
 	clk_put(priv->clk);
+
+	if (p->cleanup)
+		p->cleanup(pdev);
+
 	kfree(priv);
 
 	return 0;

include/linux/mmc/sh_mobile_sdhi.h

···
 	struct tmio_mmc_data *pdata;
 	void (*set_pwr)(struct platform_device *pdev, int state);
 	int (*get_cd)(struct platform_device *pdev);
+
+	/* callbacks for board specific setup code */
+	int (*init)(struct platform_device *pdev);
+	void (*cleanup)(struct platform_device *pdev);
 };
 
 #endif /* LINUX_MMC_SH_MOBILE_SDHI_H */