Re: [PATCH v2 2/2] clk: qcom: Add clock driver for SM8450

[Stephen Boyd <sboyd@kernel.org>]

Quoting Vinod Koul (2021-12-07 03:40:03)
> diff --git a/drivers/clk/qcom/gcc-sm8450.c b/drivers/clk/qcom/gcc-sm8450.c
> new file mode 100644
> index 000000000000..82ac419718d7
> --- /dev/null
> +++ b/drivers/clk/qcom/gcc-sm8450.c
> @@ -0,0 +1,3303 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2021, Linaro Limited
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/regmap.h>
> +
> +#include <dt-bindings/clock/qcom,gcc-sm8450.h>
> +
> +#include "clk-alpha-pll.h"
> +#include "clk-branch.h"
> +#include "clk-rcg.h"
> +#include "clk-regmap.h"
> +#include "clk-regmap-divider.h"
> +#include "clk-regmap-mux.h"
> +#include "gdsc.h"
> +#include "reset.h"
> +
> +enum {
> +       P_BI_TCXO,
> +       P_GCC_GPLL0_OUT_EVEN,
> +       P_GCC_GPLL0_OUT_MAIN,
> +       P_GCC_GPLL4_OUT_MAIN,
> +       P_GCC_GPLL9_OUT_MAIN,
> +       P_PCIE_0_PIPE_CLK,
> +       P_PCIE_1_PHY_AUX_CLK,
> +       P_PCIE_1_PIPE_CLK,
> +       P_SLEEP_CLK,
> +       P_UFS_PHY_RX_SYMBOL_0_CLK,
> +       P_UFS_PHY_RX_SYMBOL_1_CLK,
> +       P_UFS_PHY_TX_SYMBOL_0_CLK,
> +       P_USB3_PHY_WRAPPER_GCC_USB30_PIPE_CLK,
> +};
> +
> +static struct clk_alpha_pll gcc_gpll0 = {
> +       .offset = 0x0,
> +       .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_LUCID_EVO],
> +       .clkr = {
> +               .enable_reg = 0x62018,
> +               .enable_mask = BIT(0),
> +               .hw.init = &(struct clk_init_data){
> +                       .name = "gcc_gpll0",
> +                       .parent_data = &(const struct clk_parent_data){
> +                               .fw_name = "bi_tcxo",

Maybe you want to drop these strings and use the dt index directly? That
may actually be faster because we don't do as many string comparisons
and the code may be smaller if we don't have to store bi_tcxo. I suppose
to make it more readable we could have #defines for each DT index like

 #define DT_BI_TCXO	0
 #define DT_SLEEP_CLK	1

Blaze a new trail!

> +                       },
> +                       .num_parents = 1,
> +                       .ops = &clk_alpha_pll_fixed_lucid_evo_ops,
> +               },
> +       },
> +};