Re: [PATCH v2 3/3] clk: aspeed: add AST2700 clk driver

[Stephen Boyd <sboyd@kernel.org>]

Quoting Ryan Chen (2024-08-27 23:27:40)
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index 983ef4f36d8c..855b65f2d6dd 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -269,6 +269,16 @@ config COMMON_CLK_ASPEED
>           The G4 and G5 series, including the ast2400 and ast2500, are supported
>           by this driver.
>  
> +config COMMON_CLK_AST2700
> +       bool "Clock driver for AST2700 SoC"
> +       depends on ARCH_ASPEED || COMPILE_TEST
> +       select MFD_SYSCON

Why is this a syscon?

> +       select RESET_CONTROLLER
> +       help
> +         This driver provides support for clock on AST2700 SoC.
> +         This driver is responsible for managing the various clocks required
> +         by the peripherals and cores within the AST2700.
> +
>  config COMMON_CLK_S2MPS11
>         tristate "Clock driver for S2MPS1X/S5M8767 MFD"
>         depends on MFD_SEC_CORE || COMPILE_TEST
> diff --git a/drivers/clk/clk-ast2700.c b/drivers/clk/clk-ast2700.c
> new file mode 100644
> index 000000000000..7e0466e73980
> --- /dev/null
> +++ b/drivers/clk/clk-ast2700.c
> @@ -0,0 +1,1198 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2024 ASPEED Technology Inc.
> + * Author: Ryan Chen <ryan_chen@aspeedtech.com>
> + */
> +
> +#include <linux/bits.h>
> +#include <linux/clk-provider.h>
[...]
> +
> +struct ast2700_reset {
> +       void __iomem *base;
> +       struct ast2700_reset_signal const *signal;
> +       struct reset_controller_dev rcdev;
> +};

Please move the reset controller to the drivers/reset directory by means
of using an auxiliary device. There are some existing examples in there
if you grep for auxiliary_device in drivers/reset to help guide.

> +
> +#define to_rc_data(p) container_of(p, struct ast2700_reset, rcdev)
> +
[...]
> +
> +static int ast2700_soc0_clk_init(struct device_node *soc0_node)
> +{
> +       struct clk_hw_onecell_data *clk_data;
> +       void __iomem *clk_base;
[...]
> +                                            0, clk_base + SCU0_CLK_STOP,
> +                                            28, 0, &ast2700_clk_lock);
> +
> +       of_clk_add_hw_provider(soc0_node, of_clk_hw_onecell_get, clk_data);
> +
> +       return 0;
> +};
> +
> +CLK_OF_DECLARE_DRIVER(ast2700_soc0, "aspeed,ast2700-scu0", ast2700_soc0_clk_init);
> +CLK_OF_DECLARE_DRIVER(ast2700_soc1, "aspeed,ast2700-scu1", ast2700_soc1_clk_init);

Why can't this be a platform driver?