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author | Maxime Ripard <maxime.ripard@free-electrons.com> | 2017-08-25 09:42:02 +0200 |
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committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2017-09-01 01:10:19 +0200 |
commit | 17ecd246414b3a0fe0cb248c86977a8bda465b7b (patch) | |
tree | 56b0293083715c235cef9e312434cfbc200e2497 /drivers/rtc/rtc-sun6i.c | |
parent | f22d9cdcb5eb7ed1c4629a167474d68df0003a3d (diff) | |
download | linux-17ecd246414b3a0fe0cb248c86977a8bda465b7b.tar.gz linux-17ecd246414b3a0fe0cb248c86977a8bda465b7b.tar.bz2 linux-17ecd246414b3a0fe0cb248c86977a8bda465b7b.zip |
rtc: sun6i: Add support for the external oscillator gate
The RTC can output its 32kHz clock outside of the SoC, for example to clock
a WiFi chip.
Create a new clock that other devices will be able to retrieve, while
maintaining the DT stability by providing a default name for that clock if
clock-output-names doesn't list one.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc/rtc-sun6i.c')
-rw-r--r-- | drivers/rtc/rtc-sun6i.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c index 305c4d043f61..3d2216ccd860 100644 --- a/drivers/rtc/rtc-sun6i.c +++ b/drivers/rtc/rtc-sun6i.c @@ -73,6 +73,9 @@ #define SUN6I_ALARM_CONFIG 0x0050 #define SUN6I_ALARM_CONFIG_WAKEUP BIT(0) +#define SUN6I_LOSC_OUT_GATING 0x0060 +#define SUN6I_LOSC_OUT_GATING_EN BIT(0) + /* * Get date values */ @@ -125,6 +128,7 @@ struct sun6i_rtc_dev { struct clk_hw hw; struct clk_hw *int_osc; struct clk *losc; + struct clk *ext_losc; spinlock_t lock; }; @@ -188,13 +192,14 @@ static void __init sun6i_rtc_clk_init(struct device_node *node) struct clk_init_data init = { .ops = &sun6i_rtc_osc_ops, }; + const char *clkout_name = "osc32k-out"; const char *parents[2]; rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); if (!rtc) return; - clk_data = kzalloc(sizeof(*clk_data) + sizeof(*clk_data->hws), + clk_data = kzalloc(sizeof(*clk_data) + (sizeof(*clk_data->hws) * 2), GFP_KERNEL); if (!clk_data) return; @@ -235,7 +240,8 @@ static void __init sun6i_rtc_clk_init(struct device_node *node) init.parent_names = parents; init.num_parents = of_clk_get_parent_count(node) + 1; - of_property_read_string(node, "clock-output-names", &init.name); + of_property_read_string_index(node, "clock-output-names", 0, + &init.name); rtc->losc = clk_register(NULL, &rtc->hw); if (IS_ERR(rtc->losc)) { @@ -243,8 +249,20 @@ static void __init sun6i_rtc_clk_init(struct device_node *node) return; } - clk_data->num = 1; + of_property_read_string_index(node, "clock-output-names", 1, + &clkout_name); + rtc->ext_losc = clk_register_gate(NULL, clkout_name, rtc->hw.init->name, + 0, rtc->base + SUN6I_LOSC_OUT_GATING, + SUN6I_LOSC_OUT_GATING_EN, 0, + &rtc->lock); + if (IS_ERR(rtc->ext_losc)) { + pr_crit("Couldn't register the LOSC external gate\n"); + return; + } + + clk_data->num = 2; clk_data->hws[0] = &rtc->hw; + clk_data->hws[1] = __clk_get_hw(rtc->ext_losc); of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data); return; |