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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: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Boris Brezillon 2014-09-05 09:54:13 +02:00 committed by Alexandre Belloni
parent 92e963f50f
commit 863a81c3be
3 changed files with 17 additions and 7 deletions
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1
arch/arm/mach-at91/Kconfig
View File

@ -104,6 +104,7 @@ config HAVE_AT91_USB_CLK
config COMMON_CLK_AT91
bool
select COMMON_CLK
select MFD_SYSCON
config HAVE_AT91_SMD
bool

12
drivers/clk/at91/pmc.c
View File

@ -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;
spin_lock_init(&pmc->lock);
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)
return;
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)
return;
pmc = at91_pmc_init(np, regbase, virq, caps);
pmc = at91_pmc_init(np, regmap, regbase, virq, caps);
if (!pmc)
return;
for_each_child_of_node(np, childnp) {

11
drivers/clk/at91/pmc.h
View File

@ -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,