drivers/clk/at91/sama5d2.c

Source file repositories/reference/linux-study-clean/drivers/clk/at91/sama5d2.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/at91/sama5d2.c
Extension
.c
Size
12999 bytes
Lines
400
Domain
Driver Families
Bucket
drivers/clk
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <linux/clk-provider.h>
#include <linux/mfd/syscon.h>
#include <linux/slab.h>

#include <dt-bindings/clock/at91.h>

#include "pmc.h"

static DEFINE_SPINLOCK(mck_lock);

static const struct clk_master_characteristics mck_characteristics = {
	.output = { .min = 124000000, .max = 166000000 },
	.divisors = { 1, 2, 4, 3 },
};

static u8 plla_out[] = { 0 };

static u16 plla_icpll[] = { 0 };

static const struct clk_range plla_outputs[] = {
	{ .min = 600000000, .max = 1200000000 },
};

static const struct clk_pll_characteristics plla_characteristics = {
	.input = { .min = 12000000, .max = 24000000 },
	.num_output = ARRAY_SIZE(plla_outputs),
	.output = plla_outputs,
	.icpll = plla_icpll,
	.out = plla_out,
};

static const struct clk_pcr_layout sama5d2_pcr_layout = {
	.offset = 0x10c,
	.cmd = BIT(12),
	.gckcss_mask = GENMASK(10, 8),
	.pid_mask = GENMASK(6, 0),
};

static const struct {
	char *n;
	char *p;
	unsigned long flags;
	u8 id;
} sama5d2_systemck[] = {
	/*
	 * ddrck feeds DDR controller and is enabled by bootloader thus we need
	 * to keep it enabled in case there is no Linux consumer for it.
	 */
	{ .n = "ddrck", .p = "masterck_div", .id = 2, .flags = CLK_IS_CRITICAL },
	{ .n = "lcdck", .p = "masterck_div", .id = 3 },
	{ .n = "uhpck", .p = "usbck",        .id = 6 },
	{ .n = "udpck", .p = "usbck",        .id = 7 },
	{ .n = "pck0",  .p = "prog0",        .id = 8 },
	{ .n = "pck1",  .p = "prog1",        .id = 9 },
	{ .n = "pck2",  .p = "prog2",        .id = 10 },
	{ .n = "iscck", .p = "masterck_div", .id = 18 },
};

static const struct {
	char *n;
	u8 id;
	struct clk_range r;
} sama5d2_periph32ck[] = {
	{ .n = "macb0_clk",   .id = 5,  .r = { .min = 0, .max = 83000000 }, },
	{ .n = "tdes_clk",    .id = 11, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "matrix1_clk", .id = 14, },
	{ .n = "hsmc_clk",    .id = 17, },
	{ .n = "pioA_clk",    .id = 18, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "flx0_clk",    .id = 19, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "flx1_clk",    .id = 20, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "flx2_clk",    .id = 21, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "flx3_clk",    .id = 22, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "flx4_clk",    .id = 23, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "uart0_clk",   .id = 24, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "uart1_clk",   .id = 25, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "uart2_clk",   .id = 26, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "uart3_clk",   .id = 27, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "uart4_clk",   .id = 28, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "twi0_clk",    .id = 29, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "twi1_clk",    .id = 30, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "spi0_clk",    .id = 33, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "spi1_clk",    .id = 34, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "tcb0_clk",    .id = 35, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "tcb1_clk",    .id = 36, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "pwm_clk",     .id = 38, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "adc_clk",     .id = 40, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "uhphs_clk",   .id = 41, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "udphs_clk",   .id = 42, .r = { .min = 0, .max = 83000000 }, },
	{ .n = "ssc0_clk",    .id = 43, .r = { .min = 0, .max = 83000000 }, },

Annotation

Implementation Notes