[PATCH v4 14/23] clk: renesas: rcar-gen2: Obtain mode pin values using RST driver
From: Geert Uytterhoeven <hidden>
Date: 2016-10-21 13:23:07
Also in:
linux-arm-kernel, linux-renesas-soc, lkml
Subsystem:
common clk framework, renesas clock drivers, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Geert Uytterhoeven, Linus Torvalds
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 <redacted>
Acked-by: Dirk Behme <dirk.behme-V5te9oGctAVWk0Htik3J/w@public.gmane.org>
---
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
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html