[PATCH v4 4/4] ARM: OMAP2+: Add pdata quirk for sys_clkout2 for omap3 DBB056
From: Christoph Fritz <hidden>
Date: 2014-02-14 14:20:56
Also in:
linux-devicetree, linux-omap
Subsystem:
arm port, omap2+ support, the rest · Maintainers:
Russell King, Aaro Koskinen, Andreas Kemnade, Kevin Hilman, Roger Quadros, Tony Lindgren, Linus Torvalds
Full device tree support for clock control, especially to set frequencies, is not yet accomplished. Until then, configure the 24Mhz of sys_clkout2 to feed an USB-Hub here. Signed-off-by: Christoph Fritz <redacted> --- arch/arm/mach-omap2/pdata-quirks.c | 37 ++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+)
diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
index 435a823..e36ac3f 100644
--- a/arch/arm/mach-omap2/pdata-quirks.c
+++ b/arch/arm/mach-omap2/pdata-quirks.c@@ -172,6 +172,43 @@ static void __init am3517_evm_legacy_init(void) static void __init omap3_dbb056_legacy_init(void) { + struct clk *clkout2; + struct clk *cm96fck; + + /* Reparent clkout2 to 96M_FCK */ + pr_info("%s: Late Reparent clkout2 to 96M_FCK\n", __func__); + clkout2 = clk_get(NULL, "clkout2_src_ck"); + if (clkout2 < 0) { + pr_err("a83x-quirk: couldn't get clkout2_src_ck\n"); + return; + } + cm96fck = clk_get(NULL, "cm_96m_fck"); + if (cm96fck < 0) { + pr_err("a83x-quirk: couldn't get cm_96m_fck\n"); + return; + } + if (clk_set_parent(clkout2, cm96fck) < 0) { + pr_err("a83x-quirk: couldn't reparent clkout2_src_ck\n"); + return; + } + + /* Set clkout2 to 24MHz for internal usb hub*/ + pr_info("%s: Set clkout2 to 24MHz for internal usb hub\n", __func__); + clkout2 = clk_get(NULL, "sys_clkout2"); + if (clkout2 < 0) { + pr_err("%s: couldn't get sys_clkout2\n", __func__); + return; + } + if (clk_set_rate(clkout2, 24000000) < 0) { + pr_err("%s: couldn't set sys_clkout2 rate\n", __func__); + return; + } + if (clk_prepare_enable(clkout2) < 0) { + pr_err("%s: couldn't enable sys_clkout2\n", __func__); + return; + } + + /* Initialize display */ omap3_dbb056_display_init_of(); } #endif /* CONFIG_ARCH_OMAP3 */
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1.7.10.4