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spi: qup: Parse OPP table for DVFS support

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Parse the OPP table from the device tree and use dev_pm_opp_set_rate()
instead of clk_set_rate() to allow making performance state for power
domains specified in the OPP table.

This is needed to guarantee correct behavior of the clock, especially
with the higher clock/SPI bus frequencies.

Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
Link: https://lore.kernel.org/r/20230919-spi-qup-dvfs-v2-2-1bac2e9ab8db@kernkonzept.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Stephan Gerhold 2023-09-19 13:59:49 +02:00 committed by Mark Brown
parent e6419c35f0
commit 287fcdaa35
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GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 1 deletions
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12
drivers/spi/spi-qup.c
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@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
#include <linux/dmaengine.h>
@ -667,7 +668,7 @@ static int spi_qup_io_prep(struct spi_device *spi, struct spi_transfer *xfer)
return -EIO;
}
ret = clk_set_rate(controller->cclk, xfer->speed_hz);
ret = dev_pm_opp_set_rate(controller->dev, xfer->speed_hz);
if (ret) {
dev_err(controller->dev, "fail to set frequency %d",
xfer->speed_hz);
@ -1027,6 +1028,15 @@ static int spi_qup_probe(struct platform_device *pdev)
return -ENXIO;
}
ret = devm_pm_opp_set_clkname(dev, "core");
if (ret)
return ret;
/* OPP table is optional */
ret = devm_pm_opp_of_add_table(dev);
if (ret && ret != -ENODEV)
return dev_err_probe(dev, ret, "invalid OPP table\n");
host = spi_alloc_host(dev, sizeof(struct spi_qup));
if (!host) {
dev_err(dev, "cannot allocate host\n");