[PATCHv2 10/15] clk: mvebu: extend common code to allow an optional refclk
From: Thomas Petazzoni <hidden>
Date: 2015-02-20 17:04:29
Also in:
linux-arm-kernel, linux-gpio
Subsystem:
arm/marvell kirkwood and armada 370, 375, 38x, 39x, xp, 3700, 7k/8k, cn9130 soc support, common clk framework, the rest · Maintainers:
Andrew Lunn, Gregory Clement, Sebastian Hesselbarth, Michael Turquette, Stephen Boyd, Linus Torvalds
The Armada 39x, contrary to its predecessor, has a configurable reference clock frequency, of either 25 Mhz, or 40 Mhz. For the previous SoCs, it was fixed to 25 Mhz and described directly as such in the Device Tree. For Armada 39x, we need to read certain registers to know whether the frequency is 25 or 40 Mhz. Therefore, this commit extends the common mvebu clock code to allow the SoC-specific code to say it wants to register a reference clock, by giving a non-NULL ->get_refclk_freq() function pointer in its coreclk_soc_desc structure. Signed-off-by: Thomas Petazzoni <redacted> --- drivers/clk/mvebu/common.c | 17 +++++++++++++++++ drivers/clk/mvebu/common.h | 1 + 2 files changed, 18 insertions(+)
diff --git a/drivers/clk/mvebu/common.c b/drivers/clk/mvebu/common.c
index 0d4d121..15b370f 100644
--- a/drivers/clk/mvebu/common.c
+++ b/drivers/clk/mvebu/common.c@@ -121,6 +121,11 @@ void __init mvebu_coreclk_setup(struct device_node *np, /* Allocate struct for TCLK, cpu clk, and core ratio clocks */ clk_data.clk_num = 2 + desc->num_ratios; + + /* One more clock for the optional refclk */ + if (desc->get_refclk_freq) + clk_data.clk_num += 1; + clk_data.clks = kzalloc(clk_data.clk_num * sizeof(struct clk *), GFP_KERNEL); if (WARN_ON(!clk_data.clks)) {
@@ -162,6 +167,18 @@ void __init mvebu_coreclk_setup(struct device_node *np, WARN_ON(IS_ERR(clk_data.clks[2+n])); }; + /* Register optional refclk */ + if (desc->get_refclk_freq) { + const char *name = "refclk"; + of_property_read_string_index(np, "clock-output-names", + 2 + desc->num_ratios, &name); + rate = desc->get_refclk_freq(base); + clk_data.clks[2 + desc->num_ratios] = + clk_register_fixed_rate(NULL, name, NULL, + CLK_IS_ROOT, rate); + WARN_ON(IS_ERR(clk_data.clks[2 + desc->num_ratios])); + } + /* SAR register isn't needed anymore */ iounmap(base);
diff --git a/drivers/clk/mvebu/common.h b/drivers/clk/mvebu/common.h
index 783b563..f0de6c8 100644
--- a/drivers/clk/mvebu/common.h
+++ b/drivers/clk/mvebu/common.h@@ -30,6 +30,7 @@ struct coreclk_soc_desc { u32 (*get_tclk_freq)(void __iomem *sar); u32 (*get_cpu_freq)(void __iomem *sar); void (*get_clk_ratio)(void __iomem *sar, int id, int *mult, int *div); + u32 (*get_refclk_freq)(void __iomem *sar); bool (*is_sscg_enabled)(void __iomem *sar); u32 (*fix_sscg_deviation)(u32 system_clk); const struct coreclk_ratio *ratios;
--
2.1.0