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Subject[PATCH 07/26] clk: vt8500: parse pmc_base from clock driver
Date
Currently, clock providers for vt8500 depend on machine_init providing
pmc_base address before calling of_clk_init. With upcoming arch-wide
.time_init calling of_clk_init, we should make clock providers independent
of mach code. This adds a pmc_base parsing helper to current clock provider
that gets called if there is no pmc_base set, yet.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
---
Cc: Olof Johansson <olof@lixom.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Tony Prisk <linux@prisktech.co.nz>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
drivers/clk/clk-vt8500.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/clk/clk-vt8500.c b/drivers/clk/clk-vt8500.c
index 82306f5..a5ee01c 100644
--- a/drivers/clk/clk-vt8500.c
+++ b/drivers/clk/clk-vt8500.c
@@ -15,11 +15,14 @@

#include <linux/io.h>
#include <linux/of.h>
+#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>

+#define LEGACY_PMC_BASE 0xD8130000
+
/* All clocks share the same lock as none can be changed concurrently */
static DEFINE_SPINLOCK(_lock);

@@ -626,6 +629,21 @@ const struct clk_ops vtwm_pll_ops = {
.recalc_rate = vtwm_pll_recalc_rate,
};

+static __init void vtwm_set_pmc_base(void)
+{
+ struct device_node *np =
+ of_find_compatible_node(NULL, NULL, "via,vt8500-pmc");
+
+ if (np)
+ pmc_base = of_iomap(np, 0);
+ else
+ pmc_base = ioremap(LEGACY_PMC_BASE, 0x1000);
+ of_node_put(np);
+
+ if (!pmc_base)
+ pr_err("%s:of_iomap(pmc) failed\n", __func__);
+}
+
static __init void vtwm_pll_clk_init(struct device_node *node, int pll_type)
{
u32 reg;
@@ -636,6 +654,9 @@ static __init void vtwm_pll_clk_init(struct device_node *node, int pll_type)
struct clk_init_data init;
int rc;

+ if (!pmc_base)
+ vtwm_set_pmc_base();
+
rc = of_property_read_u32(node, "reg", &reg);
if (WARN_ON(rc))
return;
--
1.7.10.4


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