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Subject[PATCH 9/9] mmc: dw_mmc: Parse slot-specific configuration
Date
This commit adds code to parse the child-nodes for slot specific
configuration in the dw_mmc host driver according to
linux/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt

This change is needed when the cards have different configuration
like the 'bus-width'.

Signed-off-by: Liming Sun <lsun@mellanox.com>
Reviewed-by: Chris Metcalf <cmetcalf@mellanox.com>
---
drivers/mmc/host/dw_mmc.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index a3188c2..9d870db 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -2766,6 +2766,39 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}

+static void mmc_parse_slot_cfg(struct mmc_host *mmc)
+{
+ struct dw_mci_slot *slot = mmc_priv(mmc);
+ struct fwnode_handle *child;
+ u32 bus_width, id;
+
+ /* Find the node for this card. */
+ device_for_each_child_node(mmc->parent, child) {
+ if (!fwnode_property_read_u32(child, "reg", &id) &&
+ id == slot->id)
+ break;
+ }
+
+ if (!child)
+ return;
+
+ if (!fwnode_property_read_u32(child, "bus-width", &bus_width)) {
+ switch (bus_width) {
+ case 8:
+ mmc->caps |= MMC_CAP_8_BIT_DATA;
+ /* Hosts capable of 8-bit can also do 4 bits. */
+ case 4:
+ mmc->caps |= MMC_CAP_4_BIT_DATA;
+ break;
+ default:
+ break;
+ }
+ }
+
+ if (fwnode_property_read_bool(child, "disable-wp"))
+ mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
+}
+
static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
{
struct mmc_host *mmc;
@@ -2830,10 +2863,14 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
if (host->pdata->caps2)
mmc->caps2 = host->pdata->caps2;

+ /* Parse common configuration. */
ret = mmc_of_parse(mmc);
if (ret)
goto err_host_allocated;

+ /* Check per-slot configuration. */
+ mmc_parse_slot_cfg(mmc);
+
/* Process SDIO IRQs through the sdio_irq_work. */
if (mmc->caps & MMC_CAP_SDIO_IRQ)
mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
--
1.8.3.1
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