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mmc: zynq: Add fdt max-frequency support 

The maximum supported peripheral clock frequency of the zynq depends on
the IO routing. The MIO and EMIO support a maximum frequency of 50 MHz
respectively 25 MHz. Use the max-frequency value of the device tree to
determine the maximal supported peripheral clock frequency.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Stefan Herbrechtsmeier 2017-01-17 16:27:33 +01:00 committed by Michal Simek
parent e0f4de1afc
commit 61e745d131
1 changed files with 8 additions and 1 deletions
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9
drivers/mmc/zynq_sdhci.c
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@ -14,6 +14,8 @@
#include <malloc.h>
#include <sdhci.h>
DECLARE_GLOBAL_DATA_PTR;
#ifndef CONFIG_ZYNQ_SDHCI_MIN_FREQ
# define CONFIG_ZYNQ_SDHCI_MIN_FREQ 0
#endif
@ -21,6 +23,7 @@
struct arasan_sdhci_plat {
struct mmc_config cfg;
struct mmc mmc;
unsigned int f_max;
};
static int arasan_sdhci_probe(struct udevice *dev)
@ -60,7 +63,7 @@ static int arasan_sdhci_probe(struct udevice *dev)
host->max_clk = clock;
ret = sdhci_setup_cfg(&plat->cfg, host, CONFIG_ZYNQ_SDHCI_MAX_FREQ,
ret = sdhci_setup_cfg(&plat->cfg, host, plat->f_max,
CONFIG_ZYNQ_SDHCI_MIN_FREQ);
host->mmc = &plat->mmc;
if (ret)
@ -74,11 +77,15 @@ static int arasan_sdhci_probe(struct udevice *dev)
static int arasan_sdhci_ofdata_to_platdata(struct udevice *dev)
{
struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
struct sdhci_host *host = dev_get_priv(dev);
host->name = dev->name;
host->ioaddr = (void *)dev_get_addr(dev);
plat->f_max = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
"max-frequency", CONFIG_ZYNQ_SDHCI_MAX_FREQ);
return 0;
}