[U-Boot] [v2, 1/3] mmc: fsl_esdhc: add esdhc_imx flag

[Y.b. Lu]

The fsl_esdhc driver was for Freescale eSDHC on MPC83XX/MPC85XX
initially. The later QoriQ series processors (which were evolutions
of MPC83XX/MPC85XX) and i.MX series processors were using this
driver for their eSDHCs too.

So there are two evolution directions for eSDHC now. For the two
series processors, the eSDHCs are becoming more and more different.
We should have split it into two drivers, like them
(sdhci-of-esdhc.c/sdhci-esdhc-imx.c) in linux kernel. But it seemed
to be a lot of work now. So let's keep as it is. Be very careful to
change the driver if the changes are not common for all eSDHCs, and
clarify i.MX eSDHC specific things to distingush them with QorIQ
eSDHC.

This patch is to added an esdhc_imx flag for the development of i.MX
eSDHC, to distinguish it with QoriQ eSDHC.

Signed-off-by: Yangbo Lu <yangbo.lu at nxp.com>
---
Changes for v2:
	- Converted to use device_is_compatible().
---
 drivers/mmc/fsl_esdhc.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index 21fa2ab1d4..a647bc7f1c 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -147,6 +147,7 @@ struct fsl_esdhc_priv {
 	struct gpio_desc cd_gpio;
 	struct gpio_desc wp_gpio;
 #endif
+	bool esdhc_imx;
 };
 
 /* Return the XFERTYP flags for a given command and data packet */
@@ -1462,6 +1463,16 @@ static int fsl_esdhc_probe(struct udevice *dev)
 		priv->caps = data->caps;
 	}
 
+	/*
+	 * This is to specify whether current eSDHC is an i.MX eSDHC,
+	 * since the i.MX eSDHC has been becoming more and more different
+	 * with QorIQ eSDHC and initial MPC83XX/MPC85XX.
+	 */
+	if (!device_is_compatible(dev, "fsl,esdhc"))
+		priv->esdhc_imx = true;
+	else
+		priv->esdhc_imx = false;
+
 	val = dev_read_u32_default(dev, "bus-width", -1);
 	if (val == 8)
 		priv->bus_width = 8;
-- 
2.17.1