| From | Sebastian Hesselbarth <> | Subject | [PATCH v2 07/26] clk: vt8500: parse pmc_base from clock driver | Date | Fri, 20 Sep 2013 08:22:33 +0200 |
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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> Acked-by: Tony Prisk <linux@prisktech.co.nz> --- Changelog: v1->v2: - Also check pmc_base in vtwm_device_clk_init (Reported by Tony Prisk) This also requires vtwm_set_pmc_base to move upwards.
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 | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/drivers/clk/clk-vt8500.c b/drivers/clk/clk-vt8500.c index 82306f5..39fe72a 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); @@ -53,6 +56,21 @@ struct clk_pll { static void __iomem *pmc_base; +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__); +} + #define to_clk_device(_hw) container_of(_hw, struct clk_device, hw) #define VT8500_PMC_BUSY_MASK 0x18 @@ -222,6 +240,9 @@ static __init void vtwm_device_clk_init(struct device_node *node) int rc; int clk_init_flags = 0; + if (!pmc_base) + vtwm_set_pmc_base(); + dev_clk = kzalloc(sizeof(*dev_clk), GFP_KERNEL); if (WARN_ON(!dev_clk)) return; @@ -636,6 +657,9 @@ 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", ®); if (WARN_ON(rc)) return; -- 1.7.10.4
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