On 01/18/2017 12:27 AM, stefan.herbrechtsmeier@weidmueller.com wrote:
From: Stefan Herbrechtsmeier stefan.herbrechtsmeier@weidmueller.com
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
Best Regards, Jaehoon Chung
Changes in v2:
- Add patch to add fdt max-frequency support to zynq mmc driver
drivers/mmc/zynq_sdhci.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/zynq_sdhci.c b/drivers/mmc/zynq_sdhci.c index c73a4d3..28cedf0 100644 --- a/drivers/mmc/zynq_sdhci.c +++ b/drivers/mmc/zynq_sdhci.c @@ -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;
}