linux-kernel - Re: [PATCH v2 1/2] gpio: loongson: add dts/acpi gpio support

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Date:   Tue, 15 Nov 2022 10:05:39 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Yinbo Zhu <zhuyinbo@...ngson.cn>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        WANG Xuerui <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Juxin Gao <gaojuxin@...ngson.cn>,
        Bibo Mao <maobibo@...ngson.cn>,
        Yanteng Si <siyanteng@...ngson.cn>, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        loongarch@...ts.linux.dev, linux-mips@...r.kernel.org,
        Arnaud Patard <apatard@...driva.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        lvjianmin <lvjianmin@...ngson.cn>,
        zhanghongchen <zhanghongchen@...ngson.cn>,
        Liu Peibao <liupeibao@...ngson.cn>
Subject: Re: [PATCH v2 1/2] gpio: loongson: add dts/acpi gpio support

On Mon, Nov 14, 2022 at 10:53 AM Yinbo Zhu <zhuyinbo@...ngson.cn> wrote:
>
> The latest Loongson series platform use dts or acpi framework to
> register gpio device resources, such as the Loongson-2 series
> SoC of LOONGARCH architecture. In order to support dts, acpi and
> compatibility with previous platform device resources in driver,
> this patch was added.
>
> Signed-off-by: lvjianmin <lvjianmin@...ngson.cn>
> Signed-off-by: zhanghongchen <zhanghongchen@...ngson.cn>
> Signed-off-by: Liu Peibao <liupeibao@...ngson.cn>
> Signed-off-by: Juxin Gao <gaojuxin@...ngson.cn>
> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
> ---
> Change in v2:
>                 1. Fixup of_loongson_gpio_get_props and remove the parse logic about
>                    "loongson,conf_offset", "loongson,out_offset", "loongson,in_offset",
>                    "loongson,gpio_base", "loongson,support_irq" then kernel driver will
>                    initial them that depend compatible except "loongson,gpio_base".
>
>  arch/loongarch/include/asm/loongson.h         |  13 +
>  .../include/asm/mach-loongson2ef/loongson.h   |  12 +
>  .../include/asm/mach-loongson64/loongson.h    |  13 +
>  drivers/gpio/Kconfig                          |   6 +-
>  drivers/gpio/gpio-loongson.c                  | 422 +++++++++++++++---
>  5 files changed, 391 insertions(+), 75 deletions(-)
>
> diff --git a/arch/loongarch/include/asm/loongson.h b/arch/loongarch/include/asm/loongson.h
> index 00db93edae1b..383fdda155f0 100644
> --- a/arch/loongarch/include/asm/loongson.h
> +++ b/arch/loongarch/include/asm/loongson.h
> @@ -60,6 +60,19 @@ static inline void xconf_writeq(u64 val64, volatile void __iomem *addr)
>         );
>  }
>
> +/* ============== Data structrues =============== */
> +
> +/* gpio data */
> +struct platform_gpio_data {
> +       u32 gpio_conf;
> +       u32 gpio_out;
> +       u32 gpio_in;
> +       u32 support_irq;
> +       char *label;
> +       int gpio_base;
> +       int ngpio;
> +};

This is a terrible name for an exported structure. You would at least
need some kind of a namespace prefix. But even then the need to add a
platform data structure is very questionable. We've moved past the
need for platform data in the kernel. I don't see anyone setting it up
in this series either. Could you provide more explanation on why you
would need it and who would use it?

> +
>  /* ============== LS7A registers =============== */
>  #define LS7A_PCH_REG_BASE              0x10000000UL
>  /* LPC regs */
> diff --git a/arch/mips/include/asm/mach-loongson2ef/loongson.h b/arch/mips/include/asm/mach-loongson2ef/loongson.h
> index ca039b8dcde3..b261cea4fee1 100644
> --- a/arch/mips/include/asm/mach-loongson2ef/loongson.h
> +++ b/arch/mips/include/asm/mach-loongson2ef/loongson.h
> @@ -315,4 +315,16 @@ extern unsigned long _loongson_addrwincfg_base;
>
>  #endif /* ! CONFIG_CPU_SUPPORTS_ADDRWINCFG */
>
> +/* ============== Data structrues =============== */
> +
> +/* gpio data */
> +struct platform_gpio_data {
> +       u32 gpio_conf;
> +       u32 gpio_out;
> +       u32 gpio_in;
> +       u32 support_irq;
> +       char *label;
> +       int gpio_base;
> +       int ngpio;
> +};

No idea why you would need to duplicate it like this either. And why
put it in arch/.

[snip]

I will hold off reviewing the rest of the patch until we get that clarified.

Bartosz