Re: [PATCH 3/3] clk: qcom: dispcc-sm8750: Add SM8750 Display clock controller

[Stephen Boyd <sboyd@kernel.org>]

Quoting Krzysztof Kozlowski (2024-11-28 07:08:01)
> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
> index 2ec9be21ff678e3343cccafa85801aa68805f440..d9ab42c625ddd61f9bf1857522d44d4547e42bf5 100644
> --- a/drivers/clk/qcom/Kconfig
> +++ b/drivers/clk/qcom/Kconfig
> @@ -1022,6 +1022,16 @@ config SM_DISPCC_8550
>           Say Y if you want to support display devices and functionality such as
>           splash screen.
>  
> +config SM_DISPCC_8750
> +       tristate "SM8750 Display Clock Controller"
> +       depends on ARM64 || COMPILE_TEST

Please select QCOM_GDSC

> +       depends on SM_GCC_8750

select? Or imply? It's a functional dependency, not a build time one.

> +       help
> diff --git a/drivers/clk/qcom/dispcc-sm8750.c b/drivers/clk/qcom/dispcc-sm8750.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..ff64ff93c4dbdd2aae22b55dd0e404544cc9373e
> --- /dev/null
> +++ b/drivers/clk/qcom/dispcc-sm8750.c
> @@ -0,0 +1,1960 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2021, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2023-2024, Linaro Ltd.
> + */
> +
> +#include <linux/clk.h>

Is this include used?

> +#include <linux/clk-provider.h>
> +#include <linux/err.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/pm_runtime.h>
> +
> +#include <dt-bindings/clock/qcom,sm8750-dispcc.h>
> +
> +#include "common.h"
> +#include "clk-alpha-pll.h"
> +#include "clk-branch.h"
> +#include "clk-pll.h"
> +#include "clk-rcg.h"
> +#include "clk-regmap.h"
> +#include "clk-regmap-divider.h"
> +#include "clk-regmap-mux.h"
> +#include "reset.h"
> +#include "gdsc.h"
[...]
> +};
> +
> +static struct clk_rcg2 disp_cc_mdss_mdp_clk_src = {
> +       .cmd_rcgr = 0x8150,
> +       .mnd_width = 0,
> +       .hid_width = 5,
> +       .parent_map = disp_cc_parent_map_9,
> +       .freq_tbl = ftbl_disp_cc_mdss_mdp_clk_src,
> +       .clkr.hw.init = &(const struct clk_init_data) {
> +               .name = "disp_cc_mdss_mdp_clk_src",
> +               .parent_data = disp_cc_parent_data_9,
> +               .num_parents = ARRAY_SIZE(disp_cc_parent_data_9),
> +               .flags = CLK_SET_RATE_PARENT,
> +               .ops = &clk_rcg2_shared_ops, /* TODO: switch to cesta managed clocks */

What is cesta?

> +       },
> +};
> +
> +static struct clk_rcg2 disp_cc_mdss_pclk0_clk_src = {
> +       .cmd_rcgr = 0x8108,
> +       .mnd_width = 8,
> +       .hid_width = 5,
> +       .parent_map = disp_cc_parent_map_1,
> +       .freq_tbl = ftbl_disp_cc_esync0_clk_src,
> +       .clkr.hw.init = &(const struct clk_init_data) {
> +               .name = "disp_cc_mdss_pclk0_clk_src",
> +               .parent_data = disp_cc_parent_data_1,
> +               .num_parents = ARRAY_SIZE(disp_cc_parent_data_1),
> +               .flags = CLK_SET_RATE_PARENT,
> +               .ops = &clk_pixel_ops,
> +       },
[...]
> +               .enable_reg = 0x80b4,
> +               .enable_mask = BIT(0),
> +               .hw.init = &(const struct clk_init_data) {
> +                       .name = "disp_cc_osc_clk",
> +                       .parent_hws = (const struct clk_hw*[]) {
> +                               &disp_cc_osc_clk_src.clkr.hw,
> +                       },
> +                       .num_parents = 1,
> +                       .flags = CLK_SET_RATE_PARENT,
> +                       .ops = &clk_branch2_ops,
> +               },
> +       },
> +};
> +
> +static struct gdsc mdss_gdsc = {
> +       .gdscr = 0x9000,
> +       .en_rest_wait_val = 0x2,
> +       .en_few_wait_val = 0x2,
> +       .clk_dis_wait_val = 0xf,
> +       .pd = {
> +               .name = "mdss_gdsc",
> +       },
> +       .pwrsts = PWRSTS_OFF_ON,
> +       .flags = POLL_CFG_GDSCR | HW_CTRL | RETAIN_FF_ENABLE,
> +       // TODO: no supply?

What is this?

> +};
> +
> +static struct gdsc mdss_int2_gdsc = {
> +       .gdscr = 0xb000,
> +       .en_rest_wait_val = 0x2,
> +       .en_few_wait_val = 0x2,
> +       .clk_dis_wait_val = 0xf,
> +       .pd = {
> +               .name = "mdss_int2_gdsc",
> +       },
> +       .pwrsts = PWRSTS_OFF_ON,
> +       .flags = POLL_CFG_GDSCR | HW_CTRL | RETAIN_FF_ENABLE,