Re: [PATCH v5 7/7] clk: mediatek: Add MediaTek Helio X10 MT6795 clock drivers

[AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>]

Il 21/07/22 19:00, Christophe JAILLET ha scritto:
> Le 29/06/2022 à 13:02, AngeloGioacchino Del Regno a écrit :
>> Add the clock drivers for the entire clock tree of MediaTek Helio X10
>> MT6795, including system clocks (apmixedsys, infracfg, pericfg, topckgen)
>> and multimedia clocks (mmsys, mfg, vdecsys, vencsys).
>>
>> Signed-off-by: AngeloGioacchino Del Regno 
>> <angelogioacchino.delregno-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
>> Reviewed-by: Matthias Brugger <matthias.bgg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>> ---
>>   drivers/clk/mediatek/Kconfig                 |  37 ++
>>   drivers/clk/mediatek/Makefile                |   6 +
>>   drivers/clk/mediatek/clk-mt6795-apmixedsys.c | 157 +++++
>>   drivers/clk/mediatek/clk-mt6795-infracfg.c   | 148 +++++
>>   drivers/clk/mediatek/clk-mt6795-mfg.c        |  50 ++
>>   drivers/clk/mediatek/clk-mt6795-mm.c         | 106 ++++
>>   drivers/clk/mediatek/clk-mt6795-pericfg.c    | 160 +++++
>>   drivers/clk/mediatek/clk-mt6795-topckgen.c   | 610 +++++++++++++++++++
>>   drivers/clk/mediatek/clk-mt6795-vdecsys.c    |  55 ++
>>   drivers/clk/mediatek/clk-mt6795-vencsys.c    |  50 ++
>>   10 files changed, 1379 insertions(+)
>>   create mode 100644 drivers/clk/mediatek/clk-mt6795-apmixedsys.c
>>   create mode 100644 drivers/clk/mediatek/clk-mt6795-infracfg.c
>>   create mode 100644 drivers/clk/mediatek/clk-mt6795-mfg.c
>>   create mode 100644 drivers/clk/mediatek/clk-mt6795-mm.c
>>   create mode 100644 drivers/clk/mediatek/clk-mt6795-pericfg.c
>>   create mode 100644 drivers/clk/mediatek/clk-mt6795-topckgen.c
>>   create mode 100644 drivers/clk/mediatek/clk-mt6795-vdecsys.c
>>   create mode 100644 drivers/clk/mediatek/clk-mt6795-vencsys.c
>>
> 
> 
> [...]
> 
>> diff --git a/drivers/clk/mediatek/clk-mt6795-apmixedsys.c 
>> b/drivers/clk/mediatek/clk-mt6795-apmixedsys.c
>> new file mode 100644
>> index 000000000000..e87db76799af
>> --- /dev/null
>> +++ b/drivers/clk/mediatek/clk-mt6795-apmixedsys.c
> 
> [...]
> 
>> +static int clk_mt6795_apmixed_probe(struct platform_device *pdev)
>> +{
>> +    struct clk_hw_onecell_data *clk_data;
>> +    struct device *dev = &pdev->dev;
>> +    struct device_node *node = dev->of_node;
>> +    void __iomem *base;
>> +    struct clk_hw *hw;
>> +    int ret;
>> +
>> +    base = devm_platform_ioremap_resource(pdev, 0);
>> +    if (IS_ERR(base))
>> +        return PTR_ERR(base);
>> +
>> +    clk_data = mtk_alloc_clk_data(CLK_APMIXED_NR_CLK);
>> +    if (!clk_data)
>> +        return -ENOMEM;
>> +
>> +    ret = mtk_clk_register_plls(node, plls, ARRAY_SIZE(plls), clk_data);
>> +    if (ret)
>> +        goto free_clk_data;
>> +
>> +    hw = mtk_clk_register_ref2usb_tx("ref2usb_tx", "clk26m", base + REG_REF2USB);
> 
> This calls kzalloc() and clk_hw_register() but...
> 
>> +    if (IS_ERR(hw)) {
>> +        ret = PTR_ERR(hw);
>> +        dev_err(dev, "Failed to register ref2usb_tx: %d\n", ret);
>> +        goto unregister_plls;
>> +    }
>> +    clk_data->hws[CLK_APMIXED_REF2USB_TX] = hw;
>> +
>> +    ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
>> +    if (ret) {
>> +        dev_err(dev, "Cannot register clock provider: %d\n", ret);
>> +        goto unregister_ref2usb;
>> +    }
>> +
>> +    /* Setup MD1 to avoid random crashes */
>> +    dev_dbg(dev, "Performing initial setup for MD1\n");
>> +    clk_mt6795_apmixed_setup_md1(base);
>> +
>> +    return 0;
>> +
>> +unregister_ref2usb:
>> +    clk_hw_unregister(clk_data->hws[CLK_APMIXED_REF2USB_TX]);
> 
> ... only clk_hw_register() is undone here. Should a mtk_clk_unregister_ref2usb_tx() 
> be useful?
> 
> Or is it already handled somewhere else?
> 
>> +unregister_plls:
>> +    mtk_clk_unregister_plls(plls, ARRAY_SIZE(plls), clk_data);
>> +free_clk_data:
>> +    mtk_free_clk_data(clk_data);
>> +    return ret;
>> +}
>> +
>> +static int clk_mt6795_apmixed_remove(struct platform_device *pdev)
>> +{
>> +    struct device_node *node = pdev->dev.of_node;
>> +    struct clk_hw_onecell_data *clk_data = platform_get_drvdata(pdev);
>> +
>> +    of_clk_del_provider(node);
>> +    clk_hw_unregister(clk_data->hws[CLK_APMIXED_REF2USB_TX]);
> 
> Same here.
> 
>> +    mtk_clk_unregister_plls(plls, ARRAY_SIZE(plls), clk_data);
>> +    mtk_free_clk_data(clk_data);
>> +
>> +    return 0;
>> +}
>> +
>> +static struct platform_driver clk_mt6795_apmixed_drv = {
>> +    .probe = clk_mt6795_apmixed_probe,
>> +    .remove = clk_mt6795_apmixed_remove,
>> +    .driver = {
>> +        .name = "clk-mt6795-apmixed",
>> +        .of_match_table = of_match_clk_mt6795_apmixed,
>> +    },
>> +};
>> +module_platform_driver(clk_mt6795_apmixed_drv);
>> +
>> +MODULE_DESCRIPTION("MediaTek MT6795 apmixed clocks driver");
>> +MODULE_LICENSE("GPL v2");
> 
> [...]
> 
>> diff --git a/drivers/clk/mediatek/clk-mt6795-mm.c 
>> b/drivers/clk/mediatek/clk-mt6795-mm.c
>> new file mode 100644
>> index 000000000000..27a8859ff5b5
>> --- /dev/null
>> +++ b/drivers/clk/mediatek/clk-mt6795-mm.c
> 
> [...]
> 
>> +static int clk_mt6795_mm_probe(struct platform_device *pdev)
>> +{
>> +    struct device *dev = &pdev->dev;
>> +    struct device_node *node = dev->parent->of_node;
>> +    struct clk_hw_onecell_data *clk_data;
>> +    int ret;
>> +
>> +    clk_data = mtk_alloc_clk_data(CLK_MM_NR_CLK);
>> +    if (!clk_data)
>> +        return -ENOMEM;
>> +
>> +    ret = mtk_clk_register_gates(node, mm_gates, ARRAY_SIZE(mm_gates), clk_data);
>> +    if (ret)
> 
> Add an error handling path and call mtk_free_clk_data(clk_data); if this fails?
> 
>> +        return ret;
>> +
>> +    return of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
> 
> Same here, + mtk_clk_unregister_gates()?
> 
>> +}
>> +
>> +static struct platform_driver clk_mt6795_mm_drv = {
>> +    .driver = {
>> +        .name = "clk-mt6795-mm",
>> +    },
>> +    .probe = clk_mt6795_mm_probe,
> 
> .remove function that mimics the (non existent) error handling path of the probe?
> 
>> +};
>> +module_platform_driver(clk_mt6795_mm_drv);
>> +
>> +MODULE_DESCRIPTION("MediaTek MT6795 multimedia clocks driver");
>> +MODULE_LICENSE("GPL v2");
> 
> [...]
> 

Hello Cristophe,
thanks for the review!

I agree with all of the above, v6 will contain your proposed fixes.

Regards,
Angelo