target/linux/bcm27xx/patches-6.1/950-1250-Pisound-Read-out-the-SPI-speed-to-use-from-the-Devic.patch

   1 From 273139b285f7a1a825eb689943626a0172b8802b Mon Sep 17 00:00:00 2001
   2 From: Giedrius <giedrius@blokas.io>
   3 Date: Mon, 22 Jan 2024 13:26:58 +0000
   4 Subject: [PATCH 1250/1295] Pisound: Read out the SPI speed to use from the
   5  Device Tree.
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 Signed-off-by: Giedrius Trainavičius <giedrius@blokas.io>
  11 ---
  12  sound/soc/bcm/pisound.c | 31 ++++++++++++++++++++++++++-----
  13  1 file changed, 26 insertions(+), 5 deletions(-)
  14
  15 --- a/sound/soc/bcm/pisound.c
  16 +++ b/sound/soc/bcm/pisound.c
  17 @@ -1,6 +1,6 @@
  18  /*
  19   * Pisound Linux kernel module.
  20 - * Copyright (C) 2016-2020  Vilniaus Blokas UAB, https://blokas.io/pisound
  21 + * Copyright (C) 2016-2024  Vilniaus Blokas UAB, https://blokas.io/pisound
  22   *
  23   * This program is free software; you can redistribute it and/or
  24   * modify it under the terms of the GNU General Public License
  25 @@ -142,14 +142,14 @@ static void pisnd_input_trigger(struct s
  26         }
  27  }
  28
  29 -static struct snd_rawmidi_ops pisnd_output_ops = {
  30 +static const struct snd_rawmidi_ops pisnd_output_ops = {
  31         .open = pisnd_output_open,
  32         .close = pisnd_output_close,
  33         .trigger = pisnd_output_trigger,
  34         .drain = pisnd_output_drain,
  35  };
  36
  37 -static struct snd_rawmidi_ops pisnd_input_ops = {
  38 +static const struct snd_rawmidi_ops pisnd_input_ops = {
  39         .open = pisnd_input_open,
  40         .close = pisnd_input_close,
  41         .trigger = pisnd_input_trigger,
  42 @@ -226,6 +226,7 @@ static char g_id[25];
  43  enum { MAX_VERSION_STR_LEN = 6 };
  44  static char g_fw_version[MAX_VERSION_STR_LEN];
  45  static char g_hw_version[MAX_VERSION_STR_LEN];
  46 +static u32 g_spi_speed_hz;
  47
  48  static uint8_t g_ledFlashDuration;
  49  static bool    g_ledFlashDurationChanged;
  50 @@ -329,7 +330,7 @@ static void spi_transfer(const uint8_t *
  51         transfer.tx_buf = txbuf;
  52         transfer.rx_buf = rxbuf;
  53         transfer.len = len;
  54 -       transfer.speed_hz = 150000;
  55 +       transfer.speed_hz = g_spi_speed_hz;
  56         transfer.delay.value = 10;
  57         transfer.delay.unit = SPI_DELAY_UNIT_USECS;
  58
  59 @@ -646,6 +647,26 @@ static int pisnd_spi_init(struct device
  60         memset(g_fw_version, 0, sizeof(g_fw_version));
  61         memset(g_hw_version, 0, sizeof(g_hw_version));
  62
  63 +       g_spi_speed_hz = 150000;
  64 +       if (dev->of_node) {
  65 +               struct device_node *spi_node;
  66 +
  67 +               spi_node = of_parse_phandle(
  68 +                       dev->of_node,
  69 +                       "spi-controller",
  70 +                       0
  71 +                       );
  72 +
  73 +               if (spi_node) {
  74 +                       ret = of_property_read_u32(spi_node, "spi-speed-hz", &g_spi_speed_hz);
  75 +                       if (ret != 0)
  76 +                               printe("Failed reading spi-speed-hz! (%d)\n", ret);
  77 +
  78 +                       of_node_put(spi_node);
  79 +               }
  80 +       }
  81 +       printi("Using SPI speed: %u\n", g_spi_speed_hz);
  82 +
  83         spi = pisnd_spi_find_device();
  84
  85         if (spi != NULL) {
  86 @@ -950,7 +971,7 @@ static int pisnd_startup(struct snd_pcm_
  87         return 0;
  88  }
  89
  90 -static struct snd_soc_ops pisnd_ops = {
  91 +static const struct snd_soc_ops pisnd_ops = {
  92         .startup = pisnd_startup,
  93         .hw_params = pisnd_hw_params,
  94  };