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Date:   Fri, 30 Jun 2023 18:29:11 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Jerome Brunet <jbrunet@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Nicolas Belin <nbelin@...libre.com>
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v6 4/9] clk: meson: g12a: make VCLK2 and ENCL clock path
 configurable by CCF

In order to setup the DSI clock, let's make the unused VCLK2 clock path
configuration via CCF.

The nocache option is removed from following clocks:
- vclk2_sel
- vclk2_input
- vclk2_div
- vclk2
- vclk_div1
- vclk2_div2_en
- vclk2_div4_en
- vclk2_div6_en
- vclk2_div12_en
- vclk2_div2
- vclk2_div4
- vclk2_div6
- vclk2_div12
- cts_encl_sel

vclk2 and vclk2_div uses the newly introduced vclk regmap driver
to handle the enable and reset bits.

In order to set a rate on cts_encl via the vclk2 clock path,
the NO_REPARENT flag is set on cts_encl_sel & vclk2_sel in order
to keep CCF from selection a parent.
The parents of cts_encl_sel & vclk2_sel are expected to be defined
in DT.

The following clock scheme is to be used for DSI:

xtal
\_ gp0_pll_dco
   \_ gp0_pll
      |- vclk2_sel
      |  \_ vclk2_input
      |     \_ vclk2_div
      |        \_ vclk2
      |           \_ vclk2_div1
      |              \_ cts_encl_sel
      |                 \_ cts_encl	-> to VPU LCD Encoder
      |- mipi_dsi_pxclk_sel
      \_ mipi_dsi_pxclk_div
         \_ mipi_dsi_pxclk		-> to DSI controller

The mipi_dsi_pxclk_div is set as RO in order to use the same GP0
for mipi_dsi_pxclk and vclk2_input.

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
 drivers/clk/meson/g12a.c | 43 ++++++++++++++++++++++++++-----------------
 1 file changed, 26 insertions(+), 17 deletions(-)

diff --git a/drivers/clk/meson/g12a.c b/drivers/clk/meson/g12a.c
index 5d62134335c1..552c8efb1ad8 100644
--- a/drivers/clk/meson/g12a.c
+++ b/drivers/clk/meson/g12a.c
@@ -22,6 +22,7 @@
 #include "clk-regmap.h"
 #include "clk-cpu-dyndiv.h"
 #include "vid-pll-div.h"
+#include "vclk.h"
 #include "meson-eeclk.h"
 #include "g12a.h"
 
@@ -3165,7 +3166,7 @@ static struct clk_regmap g12a_vclk2_sel = {
 		.ops = &clk_regmap_mux_ops,
 		.parent_hws = g12a_vclk_parent_hws,
 		.num_parents = ARRAY_SIZE(g12a_vclk_parent_hws),
-		.flags = CLK_SET_RATE_NO_REPARENT | CLK_GET_RATE_NOCACHE,
+		.flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT,
 	},
 };
 
@@ -3193,7 +3194,7 @@ static struct clk_regmap g12a_vclk2_input = {
 		.ops = &clk_regmap_gate_ops,
 		.parent_hws = (const struct clk_hw *[]) { &g12a_vclk2_sel.hw },
 		.num_parents = 1,
-		.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+		.flags = CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -3215,19 +3216,22 @@ static struct clk_regmap g12a_vclk_div = {
 };
 
 static struct clk_regmap g12a_vclk2_div = {
-	.data = &(struct clk_regmap_div_data){
+	.data = &(struct clk_regmap_vclk_div_data){
 		.offset = HHI_VIID_CLK_DIV,
 		.shift = 0,
 		.width = 8,
+		.enable_bit_idx = 16,
+		.reset_bit_idx = 17,
+		.flags = CLK_DIVIDER_ROUND_CLOSEST,
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "vclk2_div",
-		.ops = &clk_regmap_divider_ops,
+		.ops = &clk_regmap_vclk_div_ops,
 		.parent_hws = (const struct clk_hw *[]) {
 			&g12a_vclk2_input.hw
 		},
 		.num_parents = 1,
-		.flags = CLK_GET_RATE_NOCACHE,
+		.flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
 	},
 };
 
@@ -3246,16 +3250,17 @@ static struct clk_regmap g12a_vclk = {
 };
 
 static struct clk_regmap g12a_vclk2 = {
-	.data = &(struct clk_regmap_gate_data){
+	.data = &(struct clk_regmap_vclk_data){
 		.offset = HHI_VIID_CLK_CNTL,
-		.bit_idx = 19,
+		.enable_bit_idx = 19,
+		.reset_bit_idx = 15,
 	},
 	.hw.init = &(struct clk_init_data) {
 		.name = "vclk2",
-		.ops = &clk_regmap_gate_ops,
+		.ops = &clk_regmap_vclk_ops,
 		.parent_hws = (const struct clk_hw *[]) { &g12a_vclk2_div.hw },
 		.num_parents = 1,
-		.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+		.flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
 	},
 };
 
@@ -3339,7 +3344,7 @@ static struct clk_regmap g12a_vclk2_div1 = {
 		.ops = &clk_regmap_gate_ops,
 		.parent_hws = (const struct clk_hw *[]) { &g12a_vclk2.hw },
 		.num_parents = 1,
-		.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+		.flags = CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -3353,7 +3358,7 @@ static struct clk_regmap g12a_vclk2_div2_en = {
 		.ops = &clk_regmap_gate_ops,
 		.parent_hws = (const struct clk_hw *[]) { &g12a_vclk2.hw },
 		.num_parents = 1,
-		.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+		.flags = CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -3367,7 +3372,7 @@ static struct clk_regmap g12a_vclk2_div4_en = {
 		.ops = &clk_regmap_gate_ops,
 		.parent_hws = (const struct clk_hw *[]) { &g12a_vclk2.hw },
 		.num_parents = 1,
-		.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+		.flags = CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -3381,7 +3386,7 @@ static struct clk_regmap g12a_vclk2_div6_en = {
 		.ops = &clk_regmap_gate_ops,
 		.parent_hws = (const struct clk_hw *[]) { &g12a_vclk2.hw },
 		.num_parents = 1,
-		.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+		.flags = CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -3395,7 +3400,7 @@ static struct clk_regmap g12a_vclk2_div12_en = {
 		.ops = &clk_regmap_gate_ops,
 		.parent_hws = (const struct clk_hw *[]) { &g12a_vclk2.hw },
 		.num_parents = 1,
-		.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+		.flags = CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -3461,6 +3466,7 @@ static struct clk_fixed_factor g12a_vclk2_div2 = {
 			&g12a_vclk2_div2_en.hw
 		},
 		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -3474,6 +3480,7 @@ static struct clk_fixed_factor g12a_vclk2_div4 = {
 			&g12a_vclk2_div4_en.hw
 		},
 		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -3487,6 +3494,7 @@ static struct clk_fixed_factor g12a_vclk2_div6 = {
 			&g12a_vclk2_div6_en.hw
 		},
 		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -3500,6 +3508,7 @@ static struct clk_fixed_factor g12a_vclk2_div12 = {
 			&g12a_vclk2_div12_en.hw
 		},
 		.num_parents = 1,
+		.flags = CLK_SET_RATE_PARENT,
 	},
 };
 
@@ -3561,7 +3570,7 @@ static struct clk_regmap g12a_cts_encl_sel = {
 		.ops = &clk_regmap_mux_ops,
 		.parent_hws = g12a_cts_parent_hws,
 		.num_parents = ARRAY_SIZE(g12a_cts_parent_hws),
-		.flags = CLK_SET_RATE_NO_REPARENT | CLK_GET_RATE_NOCACHE,
+		.flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT,
 	},
 };
 
@@ -3717,7 +3726,7 @@ static struct clk_regmap g12a_mipi_dsi_pxclk_sel = {
 		.ops = &clk_regmap_mux_ops,
 		.parent_hws = g12a_mipi_dsi_pxclk_parent_hws,
 		.num_parents = ARRAY_SIZE(g12a_mipi_dsi_pxclk_parent_hws),
-		.flags = CLK_SET_RATE_NO_REPARENT,
+		.flags = CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT,
 	},
 };
 
@@ -3729,7 +3738,7 @@ static struct clk_regmap g12a_mipi_dsi_pxclk_div = {
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "mipi_dsi_pxclk_div",
-		.ops = &clk_regmap_divider_ops,
+		.ops = &clk_regmap_divider_ro_ops,
 		.parent_hws = (const struct clk_hw *[]) {
 			&g12a_mipi_dsi_pxclk_sel.hw
 		},

-- 
2.34.1

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