Hello Neil,
On Thu, Jun 08, 2023 at 02:53:50PM +0200, Neil Armstrong wrote:
> On 08/06/2023 14:45, Jerome Brunet wrote:
> > > +struct meson_a1_pll_clks {
> > > + struct clk_hw **hw_clks;
> > > + unsigned int hw_clk_num;
> > > +};
> > > +
> > > +static struct meson_a1_pll_clks a1_pll_clks = {
> > > + .hw_clks = a1_pll_hw_clks,
> > > + .hw_clk_num = ARRAY_SIZE(a1_pll_hw_clks),
> > > +};
> > > +
> > > +static struct clk_hw *meson_a1_pll_hw_get(struct of_phandle_args *clkspec, void *clk_data)
> > > +{
> > > + const struct meson_a1_pll_clks *data = clk_data;
> > > + unsigned int idx = clkspec->args[0];
> > > +
> > > + if (idx >= data->hw_clk_num) {
> > > + pr_err("%s: invalid index %u\n", __func__, idx);
> > > + return ERR_PTR(-EINVAL);
> > > + }
> > > +
> > > + return data->hw_clks[idx];
> > > +}
> >
> > I'd prefer to have a single struct type and and single custom
> > callback for the different SoC please.
>
> Sure, I've written a common code for that, but I have a hard time finding
> a proper naming for it... so I choosed meson-clkc since it could have
> more common helper code for duplicated code over the clk driver:
>
> ===================================><============================================================================
> diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
> index 8ce846fdbe43..9070dcfd9e71 100644
> --- a/drivers/clk/meson/Kconfig
> +++ b/drivers/clk/meson/Kconfig
> @@ -30,6 +30,9 @@ config COMMON_CLK_MESON_VID_PLL_DIV
> tristate
> select COMMON_CLK_MESON_REGMAP
>
> +config COMMON_CLK_MESON_CLKC
> + tristate
> +
> config COMMON_CLK_MESON_AO_CLKC
> tristate
> select COMMON_CLK_MESON_REGMAP
> diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
> index d5288662881d..13c6db466986 100644
> --- a/drivers/clk/meson/Makefile
> +++ b/drivers/clk/meson/Makefile
> @@ -1,6 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0-only
> # Amlogic clock drivers
>
> +obj-$(CONFIG_COMMON_CLK_MESON_CLKC) += meson-clkc.o
> obj-$(CONFIG_COMMON_CLK_MESON_AO_CLKC) += meson-aoclk.o
> obj-$(CONFIG_COMMON_CLK_MESON_CPU_DYNDIV) += clk-cpu-dyndiv.o
> obj-$(CONFIG_COMMON_CLK_MESON_DUALDIV) += clk-dualdiv.o
> diff --git a/drivers/clk/meson/meson-clkc.c b/drivers/clk/meson/meson-clkc.c
> new file mode 100644
> index 000000000000..fa98b9d09011
> --- /dev/null
> +++ b/drivers/clk/meson/meson-clkc.c
> @@ -0,0 +1,25 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (c) 2023 Neil Armstrong <neil.armstrong@xxxxxxxxxx>
> + */
> +
> +#include <linux/of_device.h>
> +#include <linux/clk-provider.h>
> +#include <linux/module.h>
> +#include "meson-clkc.h"
> +
> +struct clk_hw *meson_clk_hw_get(struct of_phandle_args *clkspec, void *clk_hw_data)
> +{
> + const struct meson_clk_hw_data *data = clk_hw_data;
> + unsigned int idx = clkspec->args[0];
> +
> + if (idx >= data->num) {
> + pr_err("%s: invalid index %u\n", __func__, idx);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + return data->hws[idx];
> +}
> +EXPORT_SYMBOL_GPL(meson_clk_hw_get);
> +
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/clk/meson/meson-clkc.h b/drivers/clk/meson/meson-clkc.h
> new file mode 100644
> index 000000000000..e3bad2aa17eb
> --- /dev/null
> +++ b/drivers/clk/meson/meson-clkc.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
> +/*
> + * Copyright (c) 2023 Neil Armstrong <neil.armstrong@xxxxxxxxxx>
> + */
> +
> +#ifndef __MESON_HW_CLKC_H__
> +#define __MESON_HW_CLKC_H__
> +
> +#include <linux/of_device.h>
> +#include <linux/clk-provider.h>
> +
> +struct meson_clk_hw_data {
> + struct clk_hw **hws;
> + unsigned int num;
> +};
> +
> +struct clk_hw *meson_clk_hw_get(struct of_phandle_args *clkspec, void *clk_hw_data);
> +
> +#endif
> ===================================><============================================================================
>
> If it's ok I'll send a v2 using this.
>
> Thanks,
> Neil
In addition, I propose consolidating the probe() routine of the a1
clocks into a common part, which can be utilized for s4 and other
similar clocks. This solution was presented in the early a1 review
stages of this patch set.
https://lore.kernel.org/linux-amlogic/20221201225703.6507-7-ddrokosov@xxxxxxxxxxxxxx/
Maybe, it can be generalized for the all meson clock controller drivers.
--
Thank you,
Dmitry
