linux-kernel - [PATCH v2 10/12] clk: stm32mp1: add RTC clock

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Date:   Thu, 8 Mar 2018 17:54:03 +0100
From:   <gabriel.fernandez@...com>
To:     <sboyd@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Gabriel Fernandez <gabriel.fernandez@...com>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <gabriel.fernandez.st@...il.com>, <olivier.bideau@...com>,
        Loic PALLARDY <loic.pallardy@...com>,
        benjamin GAIGNARD <benjamin.gaignard@...com>
Subject: [PATCH v2 10/12] clk: stm32mp1: add RTC clock

From: Gabriel Fernandez <gabriel.fernandez@...com>

This patch adds the RTC clock.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...com>
---
 drivers/clk/clk-stm32mp1.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/clk/clk-stm32mp1.c b/drivers/clk/clk-stm32mp1.c
index b5379a2..51e3e76 100644
--- a/drivers/clk/clk-stm32mp1.c
+++ b/drivers/clk/clk-stm32mp1.c
@@ -248,6 +248,10 @@
 	"ck_dsi_phy", "pll4_p"
 };
 
+static const char * const rtc_src[] = {
+	"off", "ck_lse", "ck_lsi", "ck_hse_rtc"
+};
+
 static const struct clk_div_table axi_div_table[] = {
 	{ 0, 1 }, { 1, 2 }, { 2, 3 }, { 3, 4 },
 	{ 4, 4 }, { 5, 4 }, { 6, 4 }, { 7, 4 },
@@ -1945,6 +1949,17 @@ enum {
 		  _NO_GATE,
 		  _MMUX(M_ETHCK),
 		  _DIV(RCC_ETHCKSELR, 4, 4, CLK_DIVIDER_ALLOW_ZERO, NULL)),
+
+	/* RTC clock */
+	DIV(NO_ID, "ck_hse_rtc", "ck_hse", 0, RCC_RTCDIVR, 0, 7,
+	    CLK_DIVIDER_ALLOW_ZERO),
+
+	COMPOSITE(RTC, "ck_rtc", rtc_src, CLK_OPS_PARENT_ENABLE |
+		   CLK_SET_RATE_PARENT,
+		  _GATE(RCC_BDCR, 20, 0),
+		  _MUX(RCC_BDCR, 16, 2, 0),
+		  _NO_DIV),
+
 };
 
 struct stm32_clock_match_data {
-- 
1.9.1