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authorBoris Brezillon <boris.brezillon@free-electrons.com>2014-09-05 09:54:13 +0200
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2016-02-17 17:52:58 +0100
commit863a81c3be1d931bdae6426e231add9334311f13 (patch)
tree425f5509a766c4025821457a5c10cb258fc343f7
parent92e963f50fc74041b5e9e744c330dca48e04f08d (diff)
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>
-rw-r--r--arch/arm/mach-at91/Kconfig1
-rw-r--r--drivers/clk/at91/pmc.c12
-rw-r--r--drivers/clk/at91/pmc.h11
3 files changed, 17 insertions, 7 deletions
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 23be2e4..08047af 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -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
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 8476b57..4811460 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -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) {
diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
index f657392..e1fc0b0 100644
--- a/drivers/clk/at91/pmc.h
+++ b/drivers/clk/at91/pmc.h
@@ -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,