linux-kernel - [PATCH v2 4/5] clk: meson: g12a: add support for SM1 CPU 1, 2 & 3 clocks

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Message-Id: <20190826072539.27725-5-narmstrong@baylibre.com>
Date:   Mon, 26 Aug 2019 09:25:38 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     khilman@...libre.com, jbrunet@...libre.com
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-clk@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/5] clk: meson: g12a: add support for SM1 CPU 1, 2 & 3 clocks

The Amlogic SM1 can set a dedicated clock frequency for each CPU core by
having a dedicate tree for each core similar to the CPU0 tree.
Like the DSU tree, a supplementaty mux has been added to use the CPU0
frequency instead.

But since the cluster only has a single power rail and shares a single PLL,
it's not worth adding 3 unsused clock tree, so we add only the mux to
select the CPU0 clock frequency for each CPU1, CPU2 and CPU3 cores.

They are set read-only because the early boot stages sets them to select
the CPU0 input clock.

Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/clk/meson/g12a.c | 60 ++++++++++++++++++++++++++++++++++++++++
 drivers/clk/meson/g12a.h |  2 +-
 2 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/meson/g12a.c b/drivers/clk/meson/g12a.c
index e00df17f800a..ea4c791f106d 100644
--- a/drivers/clk/meson/g12a.c
+++ b/drivers/clk/meson/g12a.c
@@ -824,6 +824,60 @@ static struct clk_regmap sm1_dsu_final_clk = {
 	},
 };
 
+/* Datasheet names this field as "Cpu_clk_sync_mux_sel" bit 0 */
+static struct clk_regmap sm1_cpu1_clk = {
+	.data = &(struct clk_regmap_mux_data){
+		.offset = HHI_SYS_CPU_CLK_CNTL6,
+		.mask = 0x1,
+		.shift = 24,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "cpu1_clk",
+		.ops = &clk_regmap_mux_ro_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&g12a_cpu_clk.hw,
+			/* This CPU also have a dedicated clock tree */
+		},
+		.num_parents = 1,
+	},
+};
+
+/* Datasheet names this field as "Cpu_clk_sync_mux_sel" bit 1 */
+static struct clk_regmap sm1_cpu2_clk = {
+	.data = &(struct clk_regmap_mux_data){
+		.offset = HHI_SYS_CPU_CLK_CNTL6,
+		.mask = 0x1,
+		.shift = 25,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "cpu2_clk",
+		.ops = &clk_regmap_mux_ro_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&g12a_cpu_clk.hw,
+			/* This CPU also have a dedicated clock tree */
+		},
+		.num_parents = 1,
+	},
+};
+
+/* Datasheet names this field as "Cpu_clk_sync_mux_sel" bit 2 */
+static struct clk_regmap sm1_cpu3_clk = {
+	.data = &(struct clk_regmap_mux_data){
+		.offset = HHI_SYS_CPU_CLK_CNTL6,
+		.mask = 0x1,
+		.shift = 26,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "cpu3_clk",
+		.ops = &clk_regmap_mux_ro_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&g12a_cpu_clk.hw,
+			/* This CPU also have a dedicated clock tree */
+		},
+		.num_parents = 1,
+	},
+};
+
 /* Datasheet names this field as "Cpu_clk_sync_mux_sel" bit 4 */
 static struct clk_regmap sm1_dsu_clk = {
 	.data = &(struct clk_regmap_mux_data){
@@ -4576,6 +4630,9 @@ static struct clk_hw_onecell_data sm1_hw_onecell_data = {
 		[CLKID_DSU_CLK_DYN]		= &sm1_dsu_clk_dyn.hw,
 		[CLKID_DSU_CLK_FINAL]		= &sm1_dsu_final_clk.hw,
 		[CLKID_DSU_CLK]			= &sm1_dsu_clk.hw,
+		[CLKID_CPU1_CLK]		= &sm1_cpu1_clk.hw,
+		[CLKID_CPU2_CLK]		= &sm1_cpu2_clk.hw,
+		[CLKID_CPU3_CLK]		= &sm1_cpu3_clk.hw,
 		[NR_CLKS]			= NULL,
 	},
 	.num = NR_CLKS,
@@ -4807,6 +4864,9 @@ static struct clk_regmap *const g12a_clk_regmaps[] = {
 	&sm1_dsu_clk_dyn,
 	&sm1_dsu_final_clk,
 	&sm1_dsu_clk,
+	&sm1_cpu1_clk,
+	&sm1_cpu2_clk,
+	&sm1_cpu3_clk,
 };
 
 static const struct reg_sequence g12a_init_regs[] = {
diff --git a/drivers/clk/meson/g12a.h b/drivers/clk/meson/g12a.h
index 6804fcced6b5..9df4068aced1 100644
--- a/drivers/clk/meson/g12a.h
+++ b/drivers/clk/meson/g12a.h
@@ -256,7 +256,7 @@
 #define CLKID_DSU_CLK_DYN			250
 #define CLKID_DSU_CLK_FINAL			251
 
-#define NR_CLKS					253
+#define NR_CLKS					256
 
 /* include the CLKIDs that have been made part of the DT binding */
 #include <dt-bindings/clock/g12a-clkc.h>
-- 
2.22.0