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mmc: dwmmc: socfpga: Add reset ctrl to driver 

Add code to reset all reset signals as in mmc DT node. A reset property
is an optional feature, so only print out a warning and do not fail if a
reset property is not present.

If a reset property is discovered, then use it to deassert, thus
bringing the IP out of reset.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Ley Foon Tan 2018-06-14 18:45:21 +08:00 committed by Tom Rini
parent d99894dd3a
commit 2d4d693772
1 changed files with 17 additions and 0 deletions
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17
drivers/mmc/socfpga_dw_mmc.c
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@ -13,6 +13,7 @@
#include <linux/libfdt.h>
#include <linux/err.h>
#include <malloc.h>
#include <reset.h>
DECLARE_GLOBAL_DATA_PTR;
@ -33,6 +34,20 @@ struct dwmci_socfpga_priv_data {
unsigned int smplsel;
};
static void socfpga_dwmci_reset(struct udevice *dev)
{
struct reset_ctl_bulk reset_bulk;
int ret;
ret = reset_get_bulk(dev, &reset_bulk);
if (ret) {
dev_warn(dev, "Can't get reset: %d\n", ret);
return;
}
reset_deassert_bulk(&reset_bulk);
}
static void socfpga_dwmci_clksel(struct dwmci_host *host)
{
struct dwmci_socfpga_priv_data *priv = host->priv;
@ -109,6 +124,8 @@ static int socfpga_dwmmc_probe(struct udevice *dev)
struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
struct dwmci_host *host = &priv->host;
socfpga_dwmci_reset(dev);
#ifdef CONFIG_BLK
dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, 400000);
host->mmc = &plat->mmc;