Commit 863a81c3 authored by Boris Brezillon's avatar Boris Brezillon Committed by Alexandre Belloni

clk: at91: make use of syscon to share PMC registers in several drivers

The PMC block is providing several functionnalities:
 - system clk management
 - cpuidle
 - platform suspend

Replace the void __iomem *regs field by a regmap (retrieved using syscon)
so that we can later share the regmap across several drivers without
exporting a new specific API or a global void __iomem * variable.
Signed-off-by: default avatarBoris Brezillon <>
Signed-off-by: default avatarAlexandre Belloni <>
Acked-by: default avatarStephen Boyd <>
parent 92e963f5
......@@ -104,6 +104,7 @@ config HAVE_AT91_USB_CLK
config COMMON_CLK_AT91
config HAVE_AT91_SMD
......@@ -19,6 +19,7 @@
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/of_irq.h>
#include <linux/mfd/syscon.h>
#include <asm/proc-fns.h>
......@@ -223,6 +224,7 @@ static const struct at91_pmc_caps sama5d3_caps = {
static struct at91_pmc *__init at91_pmc_init(struct device_node *np,
struct regmap *regmap,
void __iomem *regbase, int virq,
const struct at91_pmc_caps *caps)
......@@ -238,7 +240,7 @@ static struct at91_pmc *__init at91_pmc_init(struct device_node *np,
return NULL;
pmc->regbase = regbase;
pmc->regmap = regmap;
pmc->virq = virq;
pmc->caps = caps;
......@@ -394,16 +396,18 @@ static void __init of_at91_pmc_setup(struct device_node *np,
void (*clk_setup)(struct device_node *, struct at91_pmc *);
const struct of_device_id *clk_id;
void __iomem *regbase = of_iomap(np, 0);
struct regmap *regmap;
int virq;
if (!regbase)
regmap = syscon_node_to_regmap(np);
if (IS_ERR(regmap))
panic("Could not retrieve syscon regmap");
virq = irq_of_parse_and_map(np, 0);
if (!virq)
pmc = at91_pmc_init(np, regbase, virq, caps);
pmc = at91_pmc_init(np, regmap, regbase, virq, caps);
if (!pmc)
for_each_child_of_node(np, childnp) {
......@@ -14,6 +14,7 @@
#include <linux/io.h>
#include <linux/irqdomain.h>
#include <linux/regmap.h>
#include <linux/spinlock.h>
struct clk_range {
......@@ -28,7 +29,7 @@ struct at91_pmc_caps {
struct at91_pmc {
void __iomem *regbase;
struct regmap *regmap;
int virq;
spinlock_t lock;
const struct at91_pmc_caps *caps;
......@@ -48,12 +49,16 @@ static inline void pmc_unlock(struct at91_pmc *pmc)
static inline u32 pmc_read(struct at91_pmc *pmc, int offset)
return readl(pmc->regbase + offset);
unsigned int ret = 0;
regmap_read(pmc->regmap, offset, &ret);
return ret;
static inline void pmc_write(struct at91_pmc *pmc, int offset, u32 value)
writel(value, pmc->regbase + offset);
regmap_write(pmc->regmap, offset, value);
int of_at91_get_clk_range(struct device_node *np, const char *propname,
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