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drivers: clock_control: ccm_rev2: add support for reclocking FlexSPI

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Add support for reclocking flexspi in ccm_rev2 driver. Clock update
functions are provided for the RT11xx.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2023-08-24 14:55:30 -05:00 • committed by Carles Cufí
commit a10fee2d5e
3 changed files with 112 additions and 0 deletions
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60
soc/arm/nxp_imx/rt/flexspi_rt11xx.c Normal file
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/*
* Copyright (c) 2023, NXP
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <fsl_clock.h>
#include <fsl_flexspi.h>
#include <soc.h>
#include <errno.h>
#include <zephyr/irq.h>
#include <zephyr/dt-bindings/clock/imx_ccm_rev2.h>
uint32_t flexspi_clock_set_freq(uint32_t clock_name, uint32_t rate)
{
clock_name_t root;
uint32_t root_rate;
FLEXSPI_Type *flexspi;
clock_root_t flexspi_clk;
clock_ip_name_t clk_gate;
uint32_t divider;
switch (clock_name) {
case IMX_CCM_FLEXSPI_CLK:
flexspi_clk = kCLOCK_Root_Flexspi1;
flexspi = (FLEXSPI_Type *)DT_REG_ADDR(DT_NODELABEL(flexspi));
clk_gate = kCLOCK_Flexspi1;
break;
case IMX_CCM_FLEXSPI2_CLK:
flexspi_clk = kCLOCK_Root_Flexspi2;
flexspi = (FLEXSPI_Type *)DT_REG_ADDR(DT_NODELABEL(flexspi2));
clk_gate = kCLOCK_Flexspi2;
break;
default:
return -ENOTSUP;
}
root = CLOCK_GetRootClockSource(flexspi_clk,
CLOCK_GetRootClockMux(flexspi_clk));
/* Get clock root frequency */
root_rate = CLOCK_GetFreq(root);
/* Select a divider based on root frequency */
divider = MIN((root_rate / rate), CCM_CLOCK_ROOT_CONTROL_DIV_MASK);
while (FLEXSPI_GetBusIdleStatus(flexspi) == false) {
/* Spin */
}
FLEXSPI_Enable(flexspi, false);
CLOCK_DisableClock(clk_gate);
CLOCK_SetRootClockDiv(flexspi_clk, divider);
CLOCK_EnableClock(clk_gate);
FLEXSPI_Enable(flexspi, true);
FLEXSPI_SoftwareReset(flexspi);
return 0;
}