Re: [PATCH v2 12/23] clk: mediatek: clk-mtk: Extend mtk_clk_simple_probe()

Chen-Yu Tsai
2022-12-30T07:14:46Z

On Fri, Dec 23, 2022 at 5:43 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com> wrote:
>
> As a preparation to increase probe functions commonization across
> various MediaTek SoC clock controller drivers, extend function
> mtk_clk_simple_probe() to be able to register not only gates, but
> also fixed clocks, factors, muxes and composites.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
> drivers/clk/mediatek/clk-mtk.c | 101 ++++++++++++++++++++++++++++++---
> drivers/clk/mediatek/clk-mtk.h | 10 ++++
> 2 files changed, 103 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c
> index d05364e17e95..b0a6225cd7b2 100644
> --- a/drivers/clk/mediatek/clk-mtk.c
> +++ b/drivers/clk/mediatek/clk-mtk.c
> @@ -11,12 +11,14 @@
> #include <linux/mfd/syscon.h>
> #include <linux/module.h>
> #include <linux/of.h>
> +#include <linux/of_address.h>
> #include <linux/of_device.h>
> #include <linux/platform_device.h>
> #include <linux/slab.h>
>
> #include "clk-mtk.h"
> #include "clk-gate.h"
> +#include "clk-mux.h"
>
> const struct mtk_gate_regs cg_regs_dummy = { 0, 0, 0 };
>
> @@ -465,20 +467,71 @@ int mtk_clk_simple_probe(struct platform_device *pdev)
> const struct mtk_clk_desc *mcd;
> struct clk_hw_onecell_data *clk_data;
> struct device_node *node = pdev->dev.of_node;
> - int r;
> + void __iomem *base;
> + int num_clks, r;
>
> mcd = of_device_get_match_data(&pdev->dev);
> if (!mcd)
> return -EINVAL;
>
> - clk_data = mtk_alloc_clk_data(mcd->num_clks);
> + /* Composite clocks needs us to pass iomem pointer */
> + if (mcd->composite_clks) {
> + if (!mcd->shared_io)
> + base = devm_platform_ioremap_resource(pdev, 0);
> + else
> + base = of_iomap(node, 0);
> +
> + if (IS_ERR_OR_NULL(base))
> + return IS_ERR(base) ? PTR_ERR(base) : -ENOMEM;
> + }
> +
> + /* Calculate how many clk_hw_onecell_data entries to allocate */
> + num_clks = mcd->num_clks + mcd->num_composite_clks;
> + num_clks += mcd->num_fixed_clks + mcd->num_factor_clks;
> + num_clks += mcd->num_mux_clks;
> +
> + clk_data = mtk_alloc_clk_data(num_clks);
> if (!clk_data)
> return -ENOMEM;
>
> - r = mtk_clk_register_gates(node, mcd->clks, mcd->num_clks,
> - clk_data, &pdev->dev);
> - if (r)
> - goto free_data;
> + if (mcd->fixed_clks) {
> + r = mtk_clk_register_fixed_clks(mcd->fixed_clks,
> + mcd->num_fixed_clks, clk_data);
> + if (r)
> + goto free_data;
> + }
> +
> + if (mcd->factor_clks) {
> + r = mtk_clk_register_factors(mcd->factor_clks,
> + mcd->num_factor_clks, clk_data);
> + if (r)
> + goto unregister_fixed_clks;
> + }
> +
> + if (mcd->mux_clks) {
> + r = mtk_clk_register_muxes(mcd->mux_clks, mcd->num_mux_clks,
> + node, mcd->clk_lock, clk_data,
> + &pdev->dev);
> + if (r)
> + goto unregister_factors;
> + };
> +
> + if (mcd->composite_clks) {
> + /* We don't check composite_lock because it's optional */
> + r = mtk_clk_register_composites(mcd->composite_clks,
> + mcd->num_composite_clks,
> + base, mcd->clk_lock,
> + clk_data, &pdev->dev);
> + if (r)
> + goto unregister_muxes;
> + }
> +
> + if (mcd->clks) {
> + r = mtk_clk_register_gates(node, mcd->clks, mcd->num_clks,
> + clk_data, &pdev->dev);
> + if (r)
> + goto unregister_composites;
> + }
>
> r = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
> if (r)
> @@ -496,9 +549,28 @@ int mtk_clk_simple_probe(struct platform_device *pdev)
> return r;
>
> unregister_clks:
> - mtk_clk_unregister_gates(mcd->clks, mcd->num_clks, clk_data);
> + if (mcd->clks)
> + mtk_clk_unregister_gates(mcd->clks, mcd->num_clks, clk_data);
> +unregister_composites:
> + if (mcd->composite_clks)
> + mtk_clk_unregister_composites(mcd->composite_clks,
> + mcd->num_composite_clks, clk_data);
> +unregister_muxes:
> + if (mcd->mux_clks)
> + mtk_clk_unregister_muxes(mcd->mux_clks,
> + mcd->num_mux_clks, clk_data);
> +unregister_factors:
> + if (mcd->factor_clks)
> + mtk_clk_unregister_factors(mcd->factor_clks,
> + mcd->num_factor_clks, clk_data);
> +unregister_fixed_clks:
> + if (mcd->fixed_clks)
> + mtk_clk_unregister_fixed_clks(mcd->fixed_clks,
> + mcd->num_fixed_clks, clk_data);
> free_data:
> mtk_free_clk_data(clk_data);
> + if (mcd->shared_io && base)
> + iounmap(base);
> return r;
> }
> EXPORT_SYMBOL_GPL(mtk_clk_simple_probe);
> @@ -510,7 +582,20 @@ int mtk_clk_simple_remove(struct platform_device *pdev)
> struct device_node *node = pdev->dev.of_node;
>
> of_clk_del_provider(node);
> - mtk_clk_unregister_gates(mcd->clks, mcd->num_clks, clk_data);
> + if (mcd->clks)
> + mtk_clk_unregister_gates(mcd->clks, mcd->num_clks, clk_data);
> + if (mcd->composite_clks)
> + mtk_clk_unregister_composites(mcd->composite_clks,
> + mcd->num_composite_clks, clk_data);
> + if (mcd->mux_clks)
> + mtk_clk_unregister_muxes(mcd->mux_clks,
> + mcd->num_mux_clks, clk_data);
> + if (mcd->factor_clks)
> + mtk_clk_unregister_factors(mcd->factor_clks,
> + mcd->num_factor_clks, clk_data);
> + if (mcd->fixed_clks)
> + mtk_clk_unregister_fixed_clks(mcd->fixed_clks,
> + mcd->num_fixed_clks, clk_data);
> mtk_free_clk_data(clk_data);
>
> return 0;
> diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h
> index dd43235285db..1d036ba6ca07 100644
> --- a/drivers/clk/mediatek/clk-mtk.h
> +++ b/drivers/clk/mediatek/clk-mtk.h
> @@ -220,7 +220,17 @@ void mtk_clk_unregister_ref2usb_tx(struct clk_hw *hw);
> struct mtk_clk_desc {
> const struct mtk_gate *clks;
> size_t num_clks;

I would've suggested renaming this to "gates" as well, but that seems
likely to cause additional unnecessary churn. Maybe you could leave
a comment in the header about this "historical reason"?

> + const struct mtk_composite *composite_clks;
> + size_t num_composite_clks;
> + const struct mtk_fixed_clk *fixed_clks;
> + size_t num_fixed_clks;
> + const struct mtk_fixed_factor *factor_clks;
> + size_t num_factor_clks;
> + const struct mtk_mux *mux_clks;
> + size_t num_mux_clks;

Nit: I would order these based on the order they are used/registered.

Otherwise,

Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>

> const struct mtk_clk_rst_desc *rst_desc;
> + spinlock_t *clk_lock;
> + bool shared_io;
> };
>
> int mtk_clk_simple_probe(struct platform_device *pdev);
> --
> 2.39.0
>