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spi: zynq_qspi: Use clk subsystem to get reference qspi clk

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Remove fixed reference clk used by plat->frequency and use clk
subsystem to get reference clk. As per spi dt bindings
"spi-max-frequency" property should be used by the slave devices.
This property is read by spi-uclass driver for the slave device.
So avoid reading above property from the platform driver.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
T Karthik Reddy 2020-02-04 05:47:45 -07:00 committed by Michal Simek
parent b79a7030c3
commit ea836be1e7
1 changed files with 28 additions and 8 deletions
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36
drivers/spi/zynq_qspi.c
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@ -6,8 +6,10 @@
* Xilinx Zynq Quad-SPI(QSPI) controller driver (master mode only)
*/
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <log.h>
#include <malloc.h>
#include <spi.h>
@ -105,14 +107,6 @@ static int zynq_qspi_ofdata_to_platdata(struct udevice *bus)
plat->regs = (struct zynq_qspi_regs *)fdtdec_get_addr(blob,
node, "reg");
/* FIXME: Use 166MHz as a suitable default */
plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
166666666);
plat->speed_hz = plat->frequency / 2;
debug("%s: regs=%p max-frequency=%d\n", __func__,
plat->regs, plat->frequency);
return 0;
}
@ -159,13 +153,39 @@ static int zynq_qspi_probe(struct udevice *bus)
{
struct zynq_qspi_platdata *plat = dev_get_platdata(bus);
struct zynq_qspi_priv *priv = dev_get_priv(bus);
struct clk clk;
unsigned long clock;
int ret;
priv->regs = plat->regs;
priv->fifo_depth = ZYNQ_QSPI_FIFO_DEPTH;
ret = clk_get_by_name(bus, "ref_clk", &clk);
if (ret < 0) {
dev_err(bus, "failed to get clock\n");
return ret;
}
clock = clk_get_rate(&clk);
if (IS_ERR_VALUE(clock)) {
dev_err(bus, "failed to get rate\n");
return clock;
}
ret = clk_enable(&clk);
if (ret && ret != -ENOSYS) {
dev_err(bus, "failed to enable clock\n");
return ret;
}
/* init the zynq spi hw */
zynq_qspi_init_hw(priv);
plat->frequency = clock;
plat->speed_hz = plat->frequency / 2;
debug("%s: max-frequency=%d\n", __func__, plat->speed_hz);
return 0;
}