linux-kernel - Re: [PATCH v3 2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs

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Date:   Tue, 30 Mar 2021 14:04:35 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Henning Schild <henning.schild@...mens.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        linux-watchdog@...r.kernel.org,
        Srikanth Krishnakar <skrishnakar@...il.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Gerd Haeussler <gerd.haeussler.ext@...mens.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Mark Gross <mgross@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Pavel Machek <pavel@....cz>, Enrico Weigelt <lkml@...ux.net>
Subject: Re: [PATCH v3 2/4] leds: simatic-ipc-leds: add new driver for Siemens
 Industial PCs

On Mon, Mar 29, 2021 at 8:59 PM Henning Schild
<henning.schild@...mens.com> wrote:
>
> This driver adds initial support for several devices from Siemens. It is
> based on a platform driver introduced in an earlier commit.

...

> +#define SIMATIC_IPC_LED_PORT_BASE      0x404E

> +static struct simatic_ipc_led simatic_ipc_leds_io[] = {
> +       {1 << 15, "green:" LED_FUNCTION_STATUS "-1" },
> +       {1 << 7,  "yellow:" LED_FUNCTION_STATUS "-1" },
> +       {1 << 14, "red:" LED_FUNCTION_STATUS "-2" },
> +       {1 << 6,  "yellow:" LED_FUNCTION_STATUS "-2" },
> +       {1 << 13, "red:" LED_FUNCTION_STATUS "-3" },
> +       {1 << 5,  "yellow:" LED_FUNCTION_STATUS "-3" },
> +       { }
> +};

> +static struct simatic_ipc_led simatic_ipc_leds_mem[] = {
> +       {0x500 + 0x1A0, "red:" LED_FUNCTION_STATUS "-1"},
> +       {0x500 + 0x1A8, "green:" LED_FUNCTION_STATUS "-1"},
> +       {0x500 + 0x1C8, "red:" LED_FUNCTION_STATUS "-2"},
> +       {0x500 + 0x1D0, "green:" LED_FUNCTION_STATUS "-2"},
> +       {0x500 + 0x1E0, "red:" LED_FUNCTION_STATUS "-3"},
> +       {0x500 + 0x198, "green:" LED_FUNCTION_STATUS "-3"},
> +       { }
> +};

It seems to me like poking GPIO controller registers directly. This is not good.
The question still remains: Can we simply register a GPIO (pin
control) driver and use an LED GPIO driver with an additional board
file that instantiates it?

-- 
With Best Regards,
Andy Shevchenko