linux-kernel - Re: [PATCH v6 3/4] serial: 8250_aspeed_vuart: add aspeed,lpc-io-reg and aspeed,lpc-interrupts DT properties

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Message-ID: <CAHp75VfCKRn+ER4bKf+PLhXHT0yZeN4JDufxfROa4UMf=Bc6bQ@mail.gmail.com>
Date:   Thu, 15 Apr 2021 13:46:37 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Zev Weiss <zev@...ilderbeest.net>
Cc:     Joel Stanley <joel@....id.au>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Jeffery <andrew@...id.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>
Subject: Re: [PATCH v6 3/4] serial: 8250_aspeed_vuart: add aspeed,lpc-io-reg
 and aspeed,lpc-interrupts DT properties

On Mon, Apr 12, 2021 at 7:05 AM Zev Weiss <zev@...ilderbeest.net> wrote:
>
> These allow describing all the Aspeed VUART attributes currently
> available via sysfs.  aspeed,lpc-interrupts provides a replacement for
> the deprecated aspeed,sirq-polarity-sense property.

One nit-pick below.

In any case it's fine.

> Signed-off-by: Zev Weiss <zev@...ilderbeest.net>
> ---
>  drivers/tty/serial/8250/8250_aspeed_vuart.c | 51 ++++++++++++++++++++-
>  1 file changed, 49 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c b/drivers/tty/serial/8250/8250_aspeed_vuart.c
> index 8433f8dbb186..3c239d98747f 100644
> --- a/drivers/tty/serial/8250/8250_aspeed_vuart.c
> +++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c
> @@ -28,6 +28,10 @@
>  #define ASPEED_VUART_ADDRL             0x28
>  #define ASPEED_VUART_ADDRH             0x2c
>
> +#define ASPEED_VUART_DEFAULT_LPC_ADDR  0x3f8
> +#define ASPEED_VUART_DEFAULT_SIRQ      4
> +#define ASPEED_VUART_DEFAULT_SIRQ_POLARITY     IRQ_TYPE_LEVEL_LOW
> +
>  struct aspeed_vuart {
>         struct device           *dev;
>         void __iomem            *regs;
> @@ -386,6 +390,18 @@ static void aspeed_vuart_auto_configure_sirq_polarity(
>         aspeed_vuart_set_sirq_polarity(vuart, (value & reg_mask) == 0);
>  }
>
> +static int aspeed_vuart_map_irq_polarity(u32 dt)
> +{
> +       switch (dt) {
> +       case IRQ_TYPE_LEVEL_LOW:
> +               return 0;
> +       case IRQ_TYPE_LEVEL_HIGH:
> +               return 1;
> +       default:
> +               return -EINVAL;
> +       }
> +}
> +
>  static int aspeed_vuart_probe(struct platform_device *pdev)
>  {
>         struct of_phandle_args sirq_polarity_sense_args;
> @@ -393,8 +409,8 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
>         struct aspeed_vuart *vuart;
>         struct device_node *np;
>         struct resource *res;
> -       u32 clk, prop;
> -       int rc;
> +       u32 clk, prop, sirq[2];
> +       int rc, sirq_polarity;
>
>         np = pdev->dev.of_node;
>
> @@ -501,6 +517,37 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
>                 of_node_put(sirq_polarity_sense_args.np);
>         }
>
> +       rc = of_property_read_u32(np, "aspeed,lpc-io-reg", &prop);
> +       if (rc < 0)
> +               prop = ASPEED_VUART_DEFAULT_LPC_ADDR;
> +
> +       rc = aspeed_vuart_set_lpc_address(vuart, prop);
> +       if (rc < 0) {
> +               dev_err(&pdev->dev, "invalid value in aspeed,lpc-io-reg property\n");
> +               goto err_clk_disable;
> +       }
> +
> +       rc = of_property_read_u32_array(np, "aspeed,lpc-interrupts", sirq, 2);
> +       if (rc < 0) {
> +               sirq[0] = ASPEED_VUART_DEFAULT_SIRQ;
> +               sirq[1] = ASPEED_VUART_DEFAULT_SIRQ_POLARITY;
> +       }
> +
> +       rc = aspeed_vuart_set_sirq(vuart, sirq[0]);
> +       if (rc < 0) {
> +               dev_err(&pdev->dev, "invalid sirq number in aspeed,lpc-interrupts property\n");
> +               goto err_clk_disable;
> +       }
> +
> +       sirq_polarity = aspeed_vuart_map_irq_polarity(sirq[1]);
> +       if (sirq_polarity < 0) {
> +               dev_err(&pdev->dev, "invalid sirq polarity in aspeed,lpc-interrupts property\n");

> +               rc = sirq_polarity;
> +               goto err_clk_disable;
> +       }

Why not to use the same pattern as above, i.e.

       rc = aspeed_vuart_map_irq_polarity(sirq[1]);
       if (rc < 0) {
               dev_err(&pdev->dev, "invalid sirq polarity in
aspeed,lpc-interrupts property\n");
               goto err_clk_disable;
       }
       sirq_polarity = rc;

?

> +       aspeed_vuart_set_sirq_polarity(vuart, sirq_polarity);
> +
>         aspeed_vuart_set_enabled(vuart, true);
>         aspeed_vuart_set_host_tx_discard(vuart, true);
>         platform_set_drvdata(pdev, vuart);


-- 
With Best Regards,
Andy Shevchenko