[U-Boot] [PATCH v2 4/4] mmc: zynq: Add fdt max-frequency support
Stefan Herbrechtsmeier
stefan.herbrechtsmeier at weidmueller.de
Fri Nov 25 14:59:54 CET 2016
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 at weidmueller.de>
---
Changes in v2: None
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 26bd1be..4d2f0b5 100644
--- a/drivers/mmc/zynq_sdhci.c
+++ b/drivers/mmc/zynq_sdhci.c
@@ -16,6 +16,8 @@
#include <asm/arch/clk.h>
+DECLARE_GLOBAL_DATA_PTR;
+
#ifndef CONFIG_ZYNQ_SDHCI_MIN_FREQ
# define CONFIG_ZYNQ_SDHCI_MIN_FREQ 0
#endif
@@ -23,6 +25,7 @@
struct arasan_sdhci_plat {
struct mmc_config cfg;
struct mmc mmc;
+ unsigned int f_max;
};
static int arasan_sdhci_probe(struct udevice *dev)
@@ -67,7 +70,7 @@ 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)
@@ -81,11 +84,15 @@ 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;
}
--
2.7.4
Kommanditgesellschaft - Sitz: Detmold - Amtsgericht Lemgo HRA 2790 -
Komplementärin: Weidmüller Interface Führungsgesellschaft mbH -
Sitz: Detmold - Amtsgericht Lemgo HRB 3924;
Geschäftsführer: José Carlos Álvarez Tobar, Elke Eckstein, Dr. Peter Köhler, Jörg Timmermann;
USt-ID-Nr. DE124599660
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