build/patch/kernel/archive/sunxi-5.15/patches.armbian/drv-rtc-sun6i-support-RTCs-without-external-LOSCs.patch

69 lines
2.5 KiB
Diff

From 6170919163f82880d7efd57b33c096e72efa5eda Mon Sep 17 00:00:00 2001
From: Andre Przywara <andre.przywara@arm.com>
Date: Mon, 14 Jun 2021 23:02:45 +0100
Subject: [PATCH] drv:rtc:sun6i: support RTCs without external LOSCs
Some newer Allwinner RTCs (for instance the one in the H616 SoC) lack
a pin for an external 32768 Hz oscillator. As a consequence, this LOSC
can't be selected as the RTC clock source, and we must rely on the
internal RC oscillator.
To allow additions of clocks to the RTC node, add a feature bit to ignore
any provided clocks for now (the current code would think this is the
external LOSC). Later DTs and code can then for instance add the PLL
based clock input, and older kernel won't get confused.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
drivers/rtc/rtc-sun6i.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
index 3f308bf0b..f3016bf6a 100644
--- a/drivers/rtc/rtc-sun6i.c
+++ b/drivers/rtc/rtc-sun6i.c
@@ -137,6 +137,7 @@ struct sun6i_rtc_clk_data {
unsigned int has_out_clk : 1;
unsigned int has_losc_en : 1;
unsigned int has_auto_swt : 1;
+ unsigned int no_ext_losc : 1;
};
#define RTC_LINEAR_DAY BIT(0)
@@ -259,7 +260,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
}
/* Switch to the external, more precise, oscillator, if present */
- if (of_get_property(node, "clocks", NULL)) {
+ if (!rtc->data->no_ext_losc && of_get_property(node, "clocks", NULL)) {
reg |= SUN6I_LOSC_CTRL_EXT_OSC;
if (rtc->data->has_losc_en)
reg |= SUN6I_LOSC_CTRL_EXT_LOSC_EN;
@@ -283,14 +284,19 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
}
parents[0] = clk_hw_get_name(rtc->int_osc);
- /* If there is no external oscillator, this will be NULL and ... */
- parents[1] = of_clk_get_parent_name(node, 0);
+ if (rtc->data->no_ext_losc) {
+ parents[1] = NULL;
+ init.num_parents = 1;
+ } else {
+ /* If there is no external oscillator, this will be NULL and */
+ parents[1] = of_clk_get_parent_name(node, 0);
+ /* ... number of clock parents will be 1. */
+ init.num_parents = of_clk_get_parent_count(node) + 1;
+ }
rtc->hw.init = &init;
init.parent_names = parents;
- /* ... number of clock parents will be 1. */
- init.num_parents = of_clk_get_parent_count(node) + 1;
of_property_read_string_index(node, "clock-output-names", 0,
&init.name);
--
2.35.3