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mmc: zynq: Determine base clock frequency via clock framework 

The zynq_sdhci controller driver use CONFIG_ZYNQ_SDHCI_MAX_FREQ as base
clock frequency but this clock is not fixed and depends on the hardware
configuration. Additionally the value of CONFIG_ZYNQ_SDHCI_MAX_FREQ
doesn't match the real base clock frequency of SDIO_FREQ. Use the clock
framework to determine the frequency at run time.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.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 16:27:32 +01:00 committed by Michal Simek
parent 9bb803d5b0
commit e0f4de1afc
1 changed files with 24 additions and 2 deletions
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26
drivers/mmc/zynq_sdhci.c
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@ -6,6 +6,7 @@
* SPDX-License-Identifier: GPL-2.0+
*/
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
@ -27,8 +28,29 @@ static int arasan_sdhci_probe(struct udevice *dev)
struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct sdhci_host *host = dev_get_priv(dev);
struct clk clk;
unsigned long clock;
int ret;
ret = clk_get_by_index(dev, 0, &clk);
if (ret < 0) {
dev_err(dev, "failed to get clock\n");
return ret;
}
clock = clk_get_rate(&clk);
if (IS_ERR_VALUE(clock)) {
dev_err(dev, "failed to get rate\n");
return clock;
}
debug("%s: CLK %ld\n", __func__, clock);
ret = clk_enable(&clk);
if (ret && ret != -ENOSYS) {
dev_err(dev, "failed to enable clock\n");
return ret;
}
host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD |
SDHCI_QUIRK_BROKEN_R1B;
@ -36,9 +58,9 @@ static int arasan_sdhci_probe(struct udevice *dev)
host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
#endif
host->max_clk = CONFIG_ZYNQ_SDHCI_MAX_FREQ;
host->max_clk = clock;
ret = sdhci_setup_cfg(&plat->cfg, host, 0,
ret = sdhci_setup_cfg(&plat->cfg, host, CONFIG_ZYNQ_SDHCI_MAX_FREQ,
CONFIG_ZYNQ_SDHCI_MIN_FREQ);
host->mmc = &plat->mmc;
if (ret)