linux-kernel - [PATCH 08/15] rtc: sun6i: Expose internal oscillator through device tree

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Date:   Wed, 28 Nov 2018 17:30:06 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     Chen-Yu Tsai <wens@...e.org>, linux-arm-kernel@...ts.infradead.org,
        linux-rtc@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: [PATCH 08/15] rtc: sun6i: Expose internal oscillator through device tree

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.

Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 drivers/rtc/rtc-sun6i.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
index 62ed9ce53d8c..273ab7fbbbe3 100644
--- a/drivers/rtc/rtc-sun6i.c
+++ b/drivers/rtc/rtc-sun6i.c
@@ -220,6 +220,7 @@ 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 +229,7 @@ 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 +254,10 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 	if (!of_get_property(node, "clocks", NULL))
 		goto err;
 
+	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);
@@ -290,9 +293,10 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 		return;
 	}
 
-	clk_data->num = 2;
+	clk_data->num = 3;
 	clk_data->hws[0] = &rtc->hw;
 	clk_data->hws[1] = __clk_get_hw(rtc->ext_losc);
+	clk_data->hws[2] = rtc->int_osc;
 	of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
 	return;
 
-- 
2.20.0.rc1