Re: [PATCH v1 1/3] drivers: rng: add check status bit feature

[Martin Blumenstingl]

Hello Alexey,

On Tue, Jul 25, 2023 at 4:13 PM Alexey Romanov <avromanov@xxxxxxxxxxxxxx> wrote:
[...]
>  static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
>  {
>         struct meson_rng_data *data =
>                         container_of(rng, struct meson_rng_data, rng);
> +       const struct meson_rng_priv *priv = data->priv;
> +
> +       if (priv->check_status_bit) {
> +               void __iomem *cfg_addr = data->base + priv->cfg_offset;
> +               int err;
Have you considered just creating two separate functions:
- meson_rng_read
- meson_s4_rng_read

Then you don't need all of these if/else.
You can even skip the whole offset description in your new struct
meson_rng_priv.
All of this can make the code easier to understand.

> +               writel_relaxed(readl_relaxed(cfg_addr) | BIT(SEED_READY_STS_BIT), cfg_addr);
Why not just #define SEED_READY_STS as BIT(...) right away?


Best regards,
Martin