linux-kernel - [PATCH 5/5] clk: meson: meson8b: add the vid_pll_lvds

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Message-Id: <20210104132806.720558-6-martin.blumenstingl@googlemail.com>
Date:   Mon,  4 Jan 2021 14:28:06 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     jbrunet@...libre.com, linux-amlogic@...ts.infradead.org
Cc:     mturquette@...libre.com, sboyd@...nel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 5/5] clk: meson: meson8b: add the vid_pll_lvds_en gate clock

HHI_VID_DIVIDER_CNTL[11] must be enabled for the video clock tree to
work. This bit is described as "LVDS_CLK_EN". It is not 100% clear where
this bit has to be placed in the hierarchy. But since the "LVDS_OUT" of
the HDMI PLL uses it's own set of registers it's more likely that this
"LVDS_CLK_EN" bit actually enables the input of the "hdmi_pll_lvds_out"
clock to the "vid_pll_in_sel" tree.

Add a gate definition for this bit (which will not be exported) so that
the kernel can manage all required bits to enable and disable the video
clocks.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/clk/meson/meson8b.c | 23 ++++++++++++++++++++++-
 drivers/clk/meson/meson8b.h |  3 ++-
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
index 8061c11389a9..450579779de0 100644
--- a/drivers/clk/meson/meson8b.c
+++ b/drivers/clk/meson/meson8b.c
@@ -1068,6 +1068,23 @@ static struct clk_regmap meson8b_l2_dram_clk_gate = {
 	},
 };
 
+/* also called LVDS_CLK_EN */
+static struct clk_regmap meson8b_vid_pll_lvds_en = {
+	.data = &(struct clk_regmap_gate_data){
+		.offset = HHI_VID_DIVIDER_CNTL,
+		.bit_idx = 11,
+	},
+	.hw.init = &(struct clk_init_data){
+		.name = "vid_pll_lvds_en",
+		.ops = &clk_regmap_gate_ro_ops,
+		.parent_hws = (const struct clk_hw *[]) {
+			&meson8b_hdmi_pll_lvds_out.hw
+		},
+		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
+	},
+};
+
 static struct clk_regmap meson8b_vid_pll_in_sel = {
 	.data = &(struct clk_regmap_mux_data){
 		.offset = HHI_VID_DIVIDER_CNTL,
@@ -1084,7 +1101,7 @@ static struct clk_regmap meson8b_vid_pll_in_sel = {
 		 * Meson8m2: vid2_pll
 		 */
 		.parent_hws = (const struct clk_hw *[]) {
-			&meson8b_hdmi_pll_lvds_out.hw
+			&meson8b_vid_pll_lvds_en.hw
 		},
 		.num_parents = 1,
 		.flags = CLK_SET_RATE_PARENT,
@@ -2954,6 +2971,7 @@ static struct clk_hw_onecell_data meson8_hw_onecell_data = {
 		[CLKID_CTS_MCLK_I958_DIV]   = &meson8b_cts_mclk_i958_div.hw,
 		[CLKID_CTS_MCLK_I958]	    = &meson8b_cts_mclk_i958.hw,
 		[CLKID_CTS_I958]	    = &meson8b_cts_i958.hw,
+		[CLKID_VID_PLL_LVDS_EN]	    = &meson8b_vid_pll_lvds_en.hw,
 		[CLK_NR_CLKS]		    = NULL,
 	},
 	.num = CLK_NR_CLKS,
@@ -3171,6 +3189,7 @@ static struct clk_hw_onecell_data meson8b_hw_onecell_data = {
 		[CLKID_CTS_MCLK_I958_DIV]   = &meson8b_cts_mclk_i958_div.hw,
 		[CLKID_CTS_MCLK_I958]	    = &meson8b_cts_mclk_i958.hw,
 		[CLKID_CTS_I958]	    = &meson8b_cts_i958.hw,
+		[CLKID_VID_PLL_LVDS_EN]	    = &meson8b_vid_pll_lvds_en.hw,
 		[CLK_NR_CLKS]		    = NULL,
 	},
 	.num = CLK_NR_CLKS,
@@ -3390,6 +3409,7 @@ static struct clk_hw_onecell_data meson8m2_hw_onecell_data = {
 		[CLKID_CTS_MCLK_I958_DIV]   = &meson8b_cts_mclk_i958_div.hw,
 		[CLKID_CTS_MCLK_I958]	    = &meson8b_cts_mclk_i958.hw,
 		[CLKID_CTS_I958]	    = &meson8b_cts_i958.hw,
+		[CLKID_VID_PLL_LVDS_EN]	    = &meson8b_vid_pll_lvds_en.hw,
 		[CLK_NR_CLKS]		    = NULL,
 	},
 	.num = CLK_NR_CLKS,
@@ -3588,6 +3608,7 @@ static struct clk_regmap *const meson8b_clk_regmaps[] = {
 	&meson8b_cts_mclk_i958_div,
 	&meson8b_cts_mclk_i958,
 	&meson8b_cts_i958,
+	&meson8b_vid_pll_lvds_en,
 };
 
 static const struct meson8b_clk_reset_line {
diff --git a/drivers/clk/meson/meson8b.h b/drivers/clk/meson/meson8b.h
index b1a5074cf148..954d97cf6c5a 100644
--- a/drivers/clk/meson/meson8b.h
+++ b/drivers/clk/meson/meson8b.h
@@ -182,8 +182,9 @@
 #define CLKID_CTS_MCLK_I958_DIV	211
 #define CLKID_VCLK_EN		214
 #define CLKID_VCLK2_EN		215
+#define CLKID_VID_PLL_LVDS_EN	216
 
-#define CLK_NR_CLKS		216
+#define CLK_NR_CLKS		217
 
 /*
  * include the CLKID and RESETID that have
-- 
2.30.0