[U-Boot] [PATCH v2 09/10] mmc: zynq: Determine base clock frequency via clock framework
stefan.herbrechtsmeier at weidmueller.com
stefan.herbrechtsmeier at weidmueller.com
Tue Jan 17 16:27:32 CET 2017
From: Stefan Herbrechtsmeier <stefan.herbrechtsmeier at weidmueller.com>
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 at weidmueller.com>
---
Changes in v2:
- Add patch to determine base clock frequency of zynq mmc driver via
clock framework
drivers/mmc/zynq_sdhci.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/zynq_sdhci.c b/drivers/mmc/zynq_sdhci.c
index 69efa38..c73a4d3 100644
--- a/drivers/mmc/zynq_sdhci.c
+++ b/drivers/mmc/zynq_sdhci.c
@@ -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)
--
2.7.4
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