69 lines
2.5 KiB
Diff
69 lines
2.5 KiB
Diff
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From 4b8894829753da0821970e0679e77a02b85186dd Mon Sep 17 00:00:00 2001
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From: Andre Przywara <andre.przywara@arm.com>
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Date: Mon, 14 Jun 2021 23:02:45 +0100
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Subject: [PATCH] drv:rtc:sun6i: support RTCs without external LOSCs
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Some newer Allwinner RTCs (for instance the one in the H616 SoC) lack
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a pin for an external 32768 Hz oscillator. As a consequence, this LOSC
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can't be selected as the RTC clock source, and we must rely on the
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internal RC oscillator.
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To allow additions of clocks to the RTC node, add a feature bit to ignore
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any provided clocks for now (the current code would think this is the
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external LOSC). Later DTs and code can then for instance add the PLL
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based clock input, and older kernel won't get confused.
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Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
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---
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drivers/rtc/rtc-sun6i.c | 16 +++++++++++-----
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1 file changed, 11 insertions(+), 5 deletions(-)
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diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
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index e4db445b7..055d2503c 100644
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--- a/drivers/rtc/rtc-sun6i.c
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+++ b/drivers/rtc/rtc-sun6i.c
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@@ -138,6 +138,7 @@ struct sun6i_rtc_clk_data {
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unsigned int has_out_clk : 1;
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unsigned int has_losc_en : 1;
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unsigned int has_auto_swt : 1;
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+ unsigned int no_ext_losc : 1;
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};
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#define RTC_LINEAR_DAY BIT(0)
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@@ -260,7 +261,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
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}
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/* Switch to the external, more precise, oscillator, if present */
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- if (of_get_property(node, "clocks", NULL)) {
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+ if (!rtc->data->no_ext_losc && of_get_property(node, "clocks", NULL)) {
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reg |= SUN6I_LOSC_CTRL_EXT_OSC;
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if (rtc->data->has_losc_en)
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reg |= SUN6I_LOSC_CTRL_EXT_LOSC_EN;
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@@ -284,14 +285,19 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
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}
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parents[0] = clk_hw_get_name(rtc->int_osc);
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- /* If there is no external oscillator, this will be NULL and ... */
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- parents[1] = of_clk_get_parent_name(node, 0);
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+ if (rtc->data->no_ext_losc) {
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+ parents[1] = NULL;
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+ init.num_parents = 1;
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+ } else {
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+ /* If there is no external oscillator, this will be NULL and */
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+ parents[1] = of_clk_get_parent_name(node, 0);
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+ /* ... number of clock parents will be 1. */
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+ init.num_parents = of_clk_get_parent_count(node) + 1;
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+ }
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rtc->hw.init = &init;
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init.parent_names = parents;
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- /* ... number of clock parents will be 1. */
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- init.num_parents = of_clk_get_parent_count(node) + 1;
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of_property_read_string_index(node, "clock-output-names", 0,
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&init.name);
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--
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2.34.1
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