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rtc: sun6i: Expose internal oscillator through device tree

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The bindings have been updated to expose the RTC's internal oscillator,
for some SoCs that have it directly feeding the PRCM block. The changes
include the index 2 for the clock outputs, as well as the clock output
names.

This patch adds the internal oscillator to the list of clocks exposed
through of_clk_add_hw_provider(), and also have the driver optionally
fetch the name of the clock from the device tree if it's available.

Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Chen-Yu Tsai 2018-12-03 22:58:19 +08:00 committed by Alexandre Belloni
parent 7cd1acaeea
commit c56afc1844
1 changed files with 14 additions and 2 deletions
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16
drivers/rtc/rtc-sun6i.c
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@ -136,6 +136,7 @@ struct sun6i_rtc_clk_data {
unsigned int fixed_prescaler : 16;
unsigned int has_prescaler : 1;
unsigned int has_out_clk : 1;
unsigned int export_iosc : 1;
};
struct sun6i_rtc_dev {
@ -220,6 +221,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
.ops = &sun6i_rtc_osc_ops,
.name = "losc",
};
const char *iosc_name = "rtc-int-osc";
const char *clkout_name = "osc32k-out";
const char *parents[2];
@ -228,7 +230,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
return;
rtc->data = data;
clk_data = kzalloc(struct_size(clk_data, hws, 2), GFP_KERNEL);
clk_data = kzalloc(struct_size(clk_data, hws, 3), GFP_KERNEL);
if (!clk_data) {
kfree(rtc);
return;
@ -253,8 +255,13 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
if (!of_get_property(node, "clocks", NULL))
goto err;
/* Only read IOSC name from device tree if it is exported */
if (rtc->data->export_iosc)
of_property_read_string_index(node, "clock-output-names", 2,
&iosc_name);
rtc->int_osc = clk_hw_register_fixed_rate_with_accuracy(NULL,
"rtc-int-osc",
iosc_name,
NULL, 0,
rtc->data->rc_osc_rate,
300000000);
@ -293,6 +300,10 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
clk_data->num = 2;
clk_data->hws[0] = &rtc->hw;
clk_data->hws[1] = __clk_get_hw(rtc->ext_losc);
if (rtc->data->export_iosc) {
clk_data->hws[2] = rtc->int_osc;
clk_data->num = 3;
}
of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
return;
@ -330,6 +341,7 @@ static const struct sun6i_rtc_clk_data sun8i_h3_rtc_data = {
.fixed_prescaler = 32,
.has_prescaler = 1,
.has_out_clk = 1,
.export_iosc = 1,
};
static void __init sun8i_h3_rtc_clk_init(struct device_node *node)