[PATCH RESEND 7/9] mmc/aspeed: Probe from controller

[Joel Stanley]

The Aspeed SDHCI controller is arranged with some shared control
registers, followed by one or two sets of actual SDHCI registers.

Adjust the driver to probe this controller device first. The driver then
wants to iterate over the child nodes to probe the SDHCI proper:

    ofnode node;

    dev_for_each_subnode(node, parent) {
    	struct udevice *dev;
    	int ret;

    	ret = device_bind_driver_to_node(parent, "aspeed_sdhci",
    					 ofnode_get_name(node),
    					 node, &dev);
    	if (ret)
    		return ret;
    }

However if we did this the sdhci driver would probe twice; once
"naturally" from the device tree and a second time due to this code.

Instead of doing this we can rely on the probe order, where the
controller will be set up before the sdhci devices. A better solution is
preferred.

Select MISC as the controller driver is implemented as a misc device.

Signed-off-by: Joel Stanley <joel at jms.id.au>
---
 drivers/mmc/aspeed_sdhci.c | 21 +++++++++++++++++++++
 drivers/mmc/Kconfig        |  1 +
 2 files changed, 22 insertions(+)

diff --git a/drivers/mmc/aspeed_sdhci.c b/drivers/mmc/aspeed_sdhci.c
index c71daae97584..5591fa2b0891 100644
--- a/drivers/mmc/aspeed_sdhci.c
+++ b/drivers/mmc/aspeed_sdhci.c
@@ -10,6 +10,7 @@
 #include <malloc.h>
 #include <sdhci.h>
 #include <linux/err.h>
+#include <dm/lists.h>
 
 struct aspeed_sdhci_plat {
 	struct mmc_config cfg;
@@ -94,3 +95,23 @@ U_BOOT_DRIVER(aspeed_sdhci_drv) = {
 	.priv_auto	= sizeof(struct sdhci_host),
 	.plat_auto	= sizeof(struct aspeed_sdhci_plat),
 };
+
+
+static int aspeed_sdc_probe(struct udevice *parent)
+{
+	return 0;
+}
+
+static const struct udevice_id aspeed_sdc_ids[] = {
+	{ .compatible = "aspeed,ast2400-sd-controller" },
+	{ .compatible = "aspeed,ast2500-sd-controller" },
+	{ .compatible = "aspeed,ast2600-sd-controller" },
+	{ }
+};
+
+U_BOOT_DRIVER(aspeed_sdc_drv) = {
+	.name		= "aspeed_sdc",
+	.id		= UCLASS_MISC,
+	.of_match	= aspeed_sdc_ids,
+	.probe		= aspeed_sdc_probe,
+};
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 5e2921ce41a7..07ff69afea69 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -489,6 +489,7 @@ config MMC_SDHCI_ASPEED
 	depends on ARCH_ASPEED
 	depends on DM_MMC
 	depends on MMC_SDHCI
+	select MISC
 	help
 	  Enables support for the Aspeed SDHCI 2.0 controller present on Aspeed
 	  SoCs. This device is compatible with SD 3.0 and/or MMC 4.3
-- 
2.35.1