linux-kernel - [PATCH v2 12/12] clk: stm32mp1: add Debug clocks

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Message-ID: <1520528045-18330-13-git-send-email-gabriel.fernandez@st.com>
Date:   Thu, 8 Mar 2018 17:54:05 +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 12/12] clk: stm32mp1: add Debug clocks

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

RCC manages clock for debug and trace.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...com>
---
 drivers/clk/clk-stm32mp1.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/clk/clk-stm32mp1.c b/drivers/clk/clk-stm32mp1.c
index b3a6ec4..f1d5967 100644
--- a/drivers/clk/clk-stm32mp1.c
+++ b/drivers/clk/clk-stm32mp1.c
@@ -260,6 +260,10 @@
 	"ck_mpu", "ck_axi", "ck_mcu", "pll4_p", "ck_hse", "ck_hsi"
 };
 
+static const char * const ck_trace_src[] = {
+	"ck_axi"
+};
+
 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 },
@@ -280,6 +284,12 @@
 	{ 0 },
 };
 
+static const struct clk_div_table ck_trace_div_table[] = {
+	{ 0, 1 }, { 1, 2 }, { 2, 4 }, { 3, 8 },
+	{ 4, 16 }, { 5, 16 }, { 6, 16 }, { 7, 16 },
+	{ 0 },
+};
+
 #define MAX_MUX_CLK 2
 
 struct stm32_mmux {
@@ -1980,6 +1990,18 @@ enum {
 		  _GATE(RCC_MCO2CFGR, 12, 0),
 		  _MUX(RCC_MCO2CFGR, 0, 3, 0),
 		  _DIV(RCC_MCO2CFGR, 4, 4, 0, NULL)),
+
+	/* Debug clocks */
+	FIXED_FACTOR(NO_ID, "ck_axi_div2", "ck_axi", 0, 1, 2),
+
+	GATE(DBG, "ck_apb_dbg", "ck_axi_div2", 0, RCC_DBGCFGR, 8, 0),
+
+	GATE(CK_DBG, "ck_sys_dbg", "ck_axi", 0, RCC_DBGCFGR, 8, 0),
+
+	COMPOSITE(CK_TRACE, "ck_trace", ck_trace_src, CLK_OPS_PARENT_ENABLE,
+		  _GATE(RCC_DBGCFGR, 9, 0),
+		  _NO_MUX,
+		  _DIV(RCC_DBGCFGR, 0, 3, 0, ck_trace_div_table)),
 };
 
 struct stm32_clock_match_data {
-- 
1.9.1