target/linux/generic/backport-5.15/802-v5.16-0003-nvmem-imx-ocotp-add-support-for-post-processing.patch

   1 From d0221a780cbc99fec6c27a98dba2828dc5735c00 Mon Sep 17 00:00:00 2001
   2 From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
   3 Date: Wed, 13 Oct 2021 14:19:57 +0100
   4 Subject: [PATCH] nvmem: imx-ocotp: add support for post processing
   5
   6 Add .cell_post_process callback for imx-ocotp to deal with MAC address,
   7 since MAC address need to be reversed byte for some i.MX SoCs.
   8
   9 Tested-by: Joakim Zhang <qiangqing.zhang@nxp.com>
  10 Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
  11 Link: https://lore.kernel.org/r/20211013131957.30271-4-srinivas.kandagatla@linaro.org
  12 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  13 ---
  14  drivers/nvmem/imx-ocotp.c | 25 +++++++++++++++++++++++++
  15  1 file changed, 25 insertions(+)
  16
  17 --- a/drivers/nvmem/imx-ocotp.c
  18 +++ b/drivers/nvmem/imx-ocotp.c
  19 @@ -97,6 +97,7 @@ struct ocotp_params {
  20         unsigned int bank_address_words;
  21         void (*set_timing)(struct ocotp_priv *priv);
  22         struct ocotp_ctrl_reg ctrl;
  23 +       bool reverse_mac_address;
  24  };
  25
  26  static int imx_ocotp_wait_for_busy(struct ocotp_priv *priv, u32 flags)
  27 @@ -221,6 +222,25 @@ read_end:
  28         return ret;
  29  }
  30
  31 +static int imx_ocotp_cell_pp(void *context, const char *id, unsigned int offset,
  32 +                            void *data, size_t bytes)
  33 +{
  34 +       struct ocotp_priv *priv = context;
  35 +
  36 +       /* Deal with some post processing of nvmem cell data */
  37 +       if (id && !strcmp(id, "mac-address")) {
  38 +               if (priv->params->reverse_mac_address) {
  39 +                       u8 *buf = data;
  40 +                       int i;
  41 +
  42 +                       for (i = 0; i < bytes/2; i++)
  43 +                               swap(buf[i], buf[bytes - i - 1]);
  44 +               }
  45 +       }
  46 +
  47 +       return 0;
  48 +}
  49 +
  50  static void imx_ocotp_set_imx6_timing(struct ocotp_priv *priv)
  51  {
  52         unsigned long clk_rate;
  53 @@ -468,6 +488,7 @@ static struct nvmem_config imx_ocotp_nvm
  54         .stride = 1,
  55         .reg_read = imx_ocotp_read,
  56         .reg_write = imx_ocotp_write,
  57 +       .cell_post_process = imx_ocotp_cell_pp,
  58  };
  59
  60  static const struct ocotp_params imx6q_params = {
  61 @@ -530,6 +551,7 @@ static const struct ocotp_params imx8mq_
  62         .bank_address_words = 0,
  63         .set_timing = imx_ocotp_set_imx6_timing,
  64         .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
  65 +       .reverse_mac_address = true,
  66  };
  67
  68  static const struct ocotp_params imx8mm_params = {
  69 @@ -537,6 +559,7 @@ static const struct ocotp_params imx8mm_
  70         .bank_address_words = 0,
  71         .set_timing = imx_ocotp_set_imx6_timing,
  72         .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
  73 +       .reverse_mac_address = true,
  74  };
  75
  76  static const struct ocotp_params imx8mn_params = {
  77 @@ -544,6 +567,7 @@ static const struct ocotp_params imx8mn_
  78         .bank_address_words = 0,
  79         .set_timing = imx_ocotp_set_imx6_timing,
  80         .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
  81 +       .reverse_mac_address = true,
  82  };
  83
  84  static const struct ocotp_params imx8mp_params = {
  85 @@ -551,6 +575,7 @@ static const struct ocotp_params imx8mp_
  86         .bank_address_words = 0,
  87         .set_timing = imx_ocotp_set_imx6_timing,
  88         .ctrl = IMX_OCOTP_BM_CTRL_8MP,
  89 +       .reverse_mac_address = true,
  90  };
  91
  92  static const struct of_device_id imx_ocotp_dt_ids[] = {