Re: [PATCH 2/2] clk: qcom: Add camera clock controller driver for SDM845

From: Amit Nischal
Date: Mon Jul 30 2018 - 03:20:57 EST

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In reply to: Stephen Boyd: "Re: [PATCH 2/2] clk: qcom: Add camera clock controller driver for SDM845"
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On 2018-07-26 22:52, Stephen Boyd wrote:

Quoting Amit Nischal (2018-07-23 04:26:33)

diff --git a/drivers/clk/qcom/camcc-sdm845.c b/drivers/clk/qcom/camcc-sdm845.c
new file mode 100644
index 0000000..61e5ec2
--- /dev/null
+++ b/drivers/clk/qcom/camcc-sdm845.c
@@ -0,0 +1,1736 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/clk.h>

Is this include used?

This is not required. I will remove this in next patch series.

+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <dt-bindings/clock/qcom,camcc-sdm845.h>
+
+#include "common.h"
+#include "clk-alpha-pll.h"
+#include "clk-branch.h"
+#include "clk-rcg.h"
+#include "clk-regmap.h"
+#include "gdsc.h"
+
+enum {
+ P_BI_TCXO,
+ P_CAM_CC_PLL0_OUT_EVEN,
+ P_CAM_CC_PLL1_OUT_EVEN,
+ P_CAM_CC_PLL2_OUT_EVEN,
+ P_CAM_CC_PLL3_OUT_EVEN,
+ P_CORE_BI_PLL_TEST_SE,
+};
+
+static const struct parent_map cam_cc_parent_map_0[] = {
+ { P_BI_TCXO, 0 },
+ { P_CAM_CC_PLL2_OUT_EVEN, 1 },
+ { P_CAM_CC_PLL1_OUT_EVEN, 2 },
+ { P_CAM_CC_PLL3_OUT_EVEN, 5 },
+ { P_CAM_CC_PLL0_OUT_EVEN, 6 },
+ { P_CORE_BI_PLL_TEST_SE, 7 },
+};
+
+static const char * const cam_cc_parent_names_0[] = {
+ "bi_tcxo",
+ "cam_cc_pll2_out_even",
+ "cam_cc_pll1_out_even",
+ "cam_cc_pll3_out_even",
+ "cam_cc_pll0_out_even",
+ "core_bi_pll_test_se",
+};
+
+static struct clk_alpha_pll cam_cc_pll0 = {
+ .offset = 0x0,
+ .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
+ .clkr = {
+ .hw.init = &(struct clk_init_data){
+ .name = "cam_cc_pll0",
+ .parent_names = (const char *[]){ "bi_tcxo" },
+ .num_parents = 1,
+ .ops = &clk_alpha_pll_fabia_ops,
+ },
+ },
+};
+
+static const struct clk_div_table post_div_table_fabia_even[] = {
+ { 0x0, 1 },
+ { 0x1, 2 },
+ { }
+};
+
+static struct clk_alpha_pll_postdiv cam_cc_pll0_out_even = {
+ .offset = 0x0,
+ .post_div_shift = 8,
+ .post_div_table = post_div_table_fabia_even,
+ .num_post_div = ARRAY_SIZE(post_div_table_fabia_even),
+ .width = 4,
+ .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cam_cc_pll0_out_even",
+ .parent_names = (const char *[]){ "cam_cc_pll0" },
+ .num_parents = 1,
+ .ops = &clk_alpha_pll_postdiv_fabia_ops,
+ },
+};
+
+static struct clk_alpha_pll cam_cc_pll1 = {
+ .offset = 0x1000,
+ .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
+ .clkr = {
+ .hw.init = &(struct clk_init_data){
+ .name = "cam_cc_pll1",
+ .parent_names = (const char *[]){ "bi_tcxo" },
+ .num_parents = 1,
+ .ops = &clk_alpha_pll_fabia_ops,
+ },
+ },
+};
+
+static struct clk_alpha_pll_postdiv cam_cc_pll1_out_even = {
+ .offset = 0x1000,
+ .post_div_shift = 8,
+ .post_div_table = post_div_table_fabia_even,
+ .num_post_div = ARRAY_SIZE(post_div_table_fabia_even),
+ .width = 4,
+ .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cam_cc_pll1_out_even",
+ .parent_names = (const char *[]){ "cam_cc_pll1" },
+ .num_parents = 1,
+ .ops = &clk_alpha_pll_postdiv_fabia_ops,
+ },
+};
+
+static struct clk_alpha_pll cam_cc_pll2 = {
+ .offset = 0x2000,
+ .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
+ .clkr = {
+ .hw.init = &(struct clk_init_data){
+ .name = "cam_cc_pll2",
+ .parent_names = (const char *[]){ "bi_tcxo" },
+ .num_parents = 1,
+ .ops = &clk_alpha_pll_fabia_ops,
+ },
+ },
+};
+
+static struct clk_alpha_pll_postdiv cam_cc_pll2_out_even = {
+ .offset = 0x2000,
+ .post_div_shift = 8,
+ .post_div_table = post_div_table_fabia_even,
+ .num_post_div = ARRAY_SIZE(post_div_table_fabia_even),
+ .width = 4,
+ .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cam_cc_pll2_out_even",
+ .parent_names = (const char *[]){ "cam_cc_pll2" },
+ .num_parents = 1,
+ .ops = &clk_alpha_pll_postdiv_fabia_ops,
+ },
+};
+
+static struct clk_alpha_pll cam_cc_pll3 = {
+ .offset = 0x3000,
+ .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
+ .clkr = {
+ .hw.init = &(struct clk_init_data){
+ .name = "cam_cc_pll3",
+ .parent_names = (const char *[]){ "bi_tcxo" },
+ .num_parents = 1,
+ .ops = &clk_alpha_pll_fabia_ops,
+ },
+ },
+};
+
+static struct clk_alpha_pll_postdiv cam_cc_pll3_out_even = {
+ .offset = 0x3000,
+ .post_div_shift = 8,
+ .post_div_table = post_div_table_fabia_even,
+ .num_post_div = ARRAY_SIZE(post_div_table_fabia_even),
+ .width = 4,
+ .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_FABIA],
+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cam_cc_pll3_out_even",
+ .parent_names = (const char *[]){ "cam_cc_pll3" },
+ .num_parents = 1,
+ .ops = &clk_alpha_pll_postdiv_fabia_ops,
+ },
+};
+
+static const struct freq_tbl ftbl_cam_cc_bps_clk_src[] = {
+ F(19200000, P_BI_TCXO, 1, 0, 0),
+ F(100000000, P_CAM_CC_PLL0_OUT_EVEN, 6, 0, 0),
+ F(200000000, P_CAM_CC_PLL0_OUT_EVEN, 3, 0, 0),
+ F(404000000, P_CAM_CC_PLL1_OUT_EVEN, 2, 0, 0),
+ F(480000000, P_CAM_CC_PLL2_OUT_EVEN, 1, 0, 0),
+ F(600000000, P_CAM_CC_PLL0_OUT_EVEN, 1, 0, 0),
+ { }
+};
+
+static struct clk_rcg2 cam_cc_bps_clk_src = {
+ .cmd_rcgr = 0x600c,
+ .mnd_width = 0,
+ .hid_width = 5,
+ .parent_map = cam_cc_parent_map_0,
+ .freq_tbl = ftbl_cam_cc_bps_clk_src,
+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cam_cc_bps_clk_src",
+ .parent_names = cam_cc_parent_names_0,
+ .num_parents = 6,
+ .flags = CLK_SET_RATE_PARENT,
+ .ops = &clk_rcg2_shared_ops,

Why are shared ops used in this driver?

As per HW design, most of the CAMCC RCGs needs to move to
XO during clock disable so because of this we have used the
shared ops.

+ },
+};
+
+static const struct freq_tbl ftbl_cam_cc_cci_clk_src[] = {
+ F(19200000, P_BI_TCXO, 1, 0, 0),
+ F(37500000, P_CAM_CC_PLL0_OUT_EVEN, 16, 0, 0),
+ F(50000000, P_CAM_CC_PLL0_OUT_EVEN, 12, 0, 0),
+ F(100000000, P_CAM_CC_PLL0_OUT_EVEN, 6, 0, 0),
+ { }
+};
+

[...]

+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cam_cc_mclk0_clk_src",
+ .parent_names = cam_cc_parent_names_0,
+ .num_parents = 6,
+ .flags = CLK_SET_RATE_PARENT,
+ .ops = &clk_rcg2_ops,
+ },
+};
+
+static struct clk_rcg2 cam_cc_mclk1_clk_src = {
+ .cmd_rcgr = 0x4024,
+ .mnd_width = 8,
+ .hid_width = 5,
+ .parent_map = cam_cc_parent_map_0,
+ .freq_tbl = ftbl_cam_cc_mclk0_clk_src,
+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cam_cc_mclk1_clk_src",
+ .parent_names = cam_cc_parent_names_0,
+ .num_parents = 6,
+ .flags = CLK_SET_RATE_PARENT,
+ .ops = &clk_rcg2_ops,
+ },
+};
+
+static struct clk_rcg2 cam_cc_mclk2_clk_src = {
+ .cmd_rcgr = 0x4044,
+ .mnd_width = 8,
+ .hid_width = 5,
+ .parent_map = cam_cc_parent_map_0,
+ .freq_tbl = ftbl_cam_cc_mclk0_clk_src,
+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cam_cc_mclk2_clk_src",
+ .parent_names = cam_cc_parent_names_0,
+ .num_parents = 6,
+ .flags = CLK_SET_RATE_PARENT,
+ .ops = &clk_rcg2_ops,
+ },
+};
+
+static struct clk_rcg2 cam_cc_mclk3_clk_src = {
+ .cmd_rcgr = 0x4064,
+ .mnd_width = 8,
+ .hid_width = 5,
+ .parent_map = cam_cc_parent_map_0,
+ .freq_tbl = ftbl_cam_cc_mclk0_clk_src,
+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cam_cc_mclk3_clk_src",
+ .parent_names = cam_cc_parent_names_0,
+ .num_parents = 6,
+ .flags = CLK_SET_RATE_PARENT,
+ .ops = &clk_rcg2_ops,
+ },
+};
+
+static const struct freq_tbl ftbl_cam_cc_slow_ahb_clk_src[] = {
+ F(19200000, P_BI_TCXO, 1, 0, 0),
+ F(60000000, P_CAM_CC_PLL0_OUT_EVEN, 10, 0, 0),
+ F(66666667, P_CAM_CC_PLL0_OUT_EVEN, 9, 0, 0),
+ F(73846154, P_CAM_CC_PLL2_OUT_EVEN, 6.5, 0, 0),
+ F(80000000, P_CAM_CC_PLL2_OUT_EVEN, 6, 0, 0),
+ { }
+};
+
+static struct clk_rcg2 cam_cc_slow_ahb_clk_src = {
+ .cmd_rcgr = 0x6054,
+ .mnd_width = 0,
+ .hid_width = 5,
+ .parent_map = cam_cc_parent_map_0,
+ .freq_tbl = ftbl_cam_cc_slow_ahb_clk_src,
+ .clkr.hw.init = &(struct clk_init_data){
+ .name = "cam_cc_slow_ahb_clk_src",
+ .parent_names = cam_cc_parent_names_0,
+ .num_parents = 6,
+ .flags = CLK_SET_RATE_PARENT,

Is CLK_SET_RATE_PARENT intentionally set on these RCGs so that they can
reconfigure the PLL frequency? Wouldn't that be a fixed rate PLL
frequency?

PLL2_OUT_EVEN requires to be reconfigure to 480MHz so clock sources which
are using PLL2 in their frequency table requires 'CLK_SET_RATE_PARENT'
flag to be set.

+ .ops = &clk_rcg2_ops,
+ },
+};
+

[...]

+
+static int cam_cc_sdm845_probe(struct platform_device *pdev)
+{
+ struct regmap *regmap;
+ struct alpha_pll_config cam_cc_pll_config = { };
+
+ regmap = qcom_cc_map(pdev, &cam_cc_sdm845_desc);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ cam_cc_pll_config.l = 0x1f,
+ cam_cc_pll_config.alpha = 0x4000,

Replace these commas with semicolons.

Ok sure. I will do as suggested in the next patch series.

+ clk_fabia_pll_configure(&cam_cc_pll0, regmap, &cam_cc_pll_config);
+
+ cam_cc_pll_config.l = 0x2a,
+ cam_cc_pll_config.alpha = 0x1556,
+ clk_fabia_pll_configure(&cam_cc_pll1, regmap, &cam_cc_pll_config);

All over this function.

Can you also add comments in the commit text and code describing why
oddities like CLK_SET_RATE_PARENT on RCGs and shared rcg ops is used?

ok sure will add the same in the next patch series.

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Next message: Geert Uytterhoeven: "Re: [PATCH v4 08/11] macintosh/via-pmu68k: Don't load driver on unsupported hardware"
Previous message: Huaisheng Ye: "[PATCH v3 6/6] filesystem-dax: Do not request kaddr and pfn when not required"
In reply to: Stephen Boyd: "Re: [PATCH 2/2] clk: qcom: Add camera clock controller driver for SDM845"
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