[PATCH v2 3/4] mmc: Set slot_no on devicetree / of systems too

[Hans de Goede]

Some host controllers have multiple slots. The mmc-core sofar does not
really have any knowledge of this, the host drivers for these controllers
simple call mmc_add_host() multiple times.

These mmc_host-s will share their parent device and on devicetree systems
also their parent->of_node.

This commit makes multi-slot mmc host drivers set the already existing, but
sofar only used for ACPI, slot_no member of mmc_host so that mmc-core functions
parsing the devicetree can determine what the right slot devicetree subnode is
to parse for a multi-slot host.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/mmc/host/atmel-mci.c | 1 +
 drivers/mmc/host/dw_mmc.c    | 1 +
 include/linux/mmc/host.h     | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 42706ea..a58906b 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -2170,6 +2170,7 @@ static int __init atmci_init_slot(struct atmel_mci *host,
 		slot_data->wp_pin);
 
 	mmc->ops = &atmci_ops;
+	mmc->slotno = id;
 	mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
 	mmc->f_max = host->bus_hz / 2;
 	mmc->ocr_avail	= MMC_VDD_32_33 | MMC_VDD_33_34;
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index cced599..c27a86b 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -2149,6 +2149,7 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
 	slot->quirks = dw_mci_of_get_slot_quirks(host->dev, slot->id);
 
 	mmc->ops = &dw_mci_ops;
+	mmc->slotno = id;
 	if (of_property_read_u32_array(host->dev->of_node,
 				       "clock-freq-min-max", freq, 2)) {
 		mmc->f_min = DW_MCI_FREQ_MIN;
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index cb61ea4..10d1091 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -356,7 +356,7 @@ struct mmc_host {
 
 	unsigned int		actual_clock;	/* Actual HC clock rate */
 
-	unsigned int		slotno;	/* used for sdio acpi binding */
+	unsigned int		slotno;	/* used for sdio acpi / of binding */
 
 	unsigned long		private[0] ____cacheline_aligned;
 };
-- 
2.0.0