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clk: renesas: rcar-gen2: Obtain mode pin values using RST driver

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Obtain the values of the mode pins from the R-Car RST driver, which
relies on the presence in DT of a device node for the RST module.

Fall back to our own private copy of rcar_gen2_read_mode_pins() for
backward-compatibility with old DTs.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Dirk Behme <dirk.behme@de.bosch.com>
This commit is contained in:
Geert Uytterhoeven 2015-07-07 14:57:37 +02:00
parent 931db8a0c6
commit f84c9c3ca9
1 changed files with 25 additions and 0 deletions
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25
drivers/clk/renesas/clk-rcar-gen2.c
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@ -19,6 +19,7 @@
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/soc/renesas/rcar-rst.h>
struct rcar_gen2_cpg {
struct clk_onecell_data data;
@ -364,6 +365,23 @@ rcar_gen2_cpg_register_clock(struct device_node *np, struct rcar_gen2_cpg *cpg,
4, 0, table, &cpg->lock);
}
/*
* Reset register definitions.
*/
#define MODEMR 0xe6160060
static u32 __init rcar_gen2_read_mode_pins(void)
{
void __iomem *modemr = ioremap_nocache(MODEMR, 4);
u32 mode;
BUG_ON(!modemr);
mode = ioread32(modemr);
iounmap(modemr);
return mode;
}
static void __init rcar_gen2_cpg_clocks_init(struct device_node *np)
{
const struct cpg_pll_config *config;
@ -372,6 +390,13 @@ static void __init rcar_gen2_cpg_clocks_init(struct device_node *np)
unsigned int i;
int num_clks;
if (rcar_rst_read_mode_pins(&cpg_mode)) {
/* Backward-compatibility with old DT */
pr_warn("%s: failed to obtain mode pins from RST\n",
np->full_name);
cpg_mode = rcar_gen2_read_mode_pins();
}
num_clks = of_property_count_strings(np, "clock-output-names");
if (num_clks < 0) {
pr_err("%s: failed to count clocks\n", __func__);