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@xxxxxxxxx>
Acked-by: Dirk Behme <dirk.behme@xxxxxxxxxxxx>
---
v4:
- Add Acked-by,
- Use our own private copy of rcar_gen2_read_mode_pins() instead of
the one in the R-Car Gen2 platform code, as the latter is planned to
be removed,
v3:
- Use the R-Car RST driver instead of syscon/regmap and the
"renesas,modemr" property in DT,
v2:
- drivers/clk/shmobile/ was renamed to drivers/clk/renesas/.
---
drivers/clk/renesas/clk-rcar-gen2.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/clk/renesas/clk-rcar-gen2.c b/drivers/clk/renesas/clk-rcar-gen2.c
index 00e6aba4b9c09596..3291fd430ad4e215 100644
--- a/drivers/clk/renesas/clk-rcar-gen2.c
+++ b/drivers/clk/renesas/clk-rcar-gen2.c
@@ -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 @@ struct cpg_pll_config {
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__);
--
1.9.1
--
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