Re: [PATCH v1 09/11] ARM: protonic-imx6: port protonic specific board code

[Oleksij Rempel <o.rempel@pengutronix.de>]

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On Mon, Aug 03, 2020 at 10:49:23PM +0200, Sascha Hauer wrote:
> On Thu, Jul 23, 2020 at 12:33:24PM +0200, Oleksij Rempel wrote:
> > Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> > ---
> >  arch/arm/boards/protonic-imx6/Makefile |   1 +
> >  arch/arm/boards/protonic-imx6/board.c  | 598 +++++++++++++++++++++++++
> >  2 files changed, 599 insertions(+)
> >  create mode 100644 arch/arm/boards/protonic-imx6/board.c
> > 
> > +static int prt_imx6_nvmem_link_fec(struct prt_imx6_priv *priv,
> > +				   struct device_node *root,
> > +				   struct device_node *nvmem_node)
> > +{
> > +	struct device_node *fec_node;
> > +	phandle nvmem_handle;
> > +	int ret;
> > +
> > +	fec_node = of_find_node_by_alias(root, "ethernet0");
> > +	if (!fec_node) {
> > +		dev_err(priv->dev, "Cant find the fec node\n");
> > +		return -ENODEV;
> > +	}
> > +
> > +	nvmem_handle = of_node_create_phandle(nvmem_node);
> > +
> > +	ret = of_property_write_u32(fec_node, "nvmem-cells", nvmem_handle);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = of_property_write_string(fec_node, "nvmem-cell-names",
> > +				       "mac-address");
> > +	if (ret)
> > +		return ret;
> > +
> > +	return 0;
> > +}
> 
> barebox will already write the "mac-address" property to the fec node.
> Isn't this enough?

My motivation for doing this is following:
- we can't make sure i2c is already probed at this point
- if we will decide to speed up the boot, it will be more effective to
  let linux read the eeprom
- usually, vendors tend to avoid updating the bootloader in the field.
  So, it is better to provide all needed information the devicetree to
  let the linux make the right choice.
- in long term, even in barebox we will need to work deferred probe. So,
  it is better to prepare the devicetree and let the system do all
  needed work.

> > +
> > +static struct device_node *
> > +prt_imx6_create_nvmem_cells(struct prt_imx6_priv *priv,
> > +			    struct device_node *nvmem_node,
> > +			    const char *node_name, size_t offset, size_t size)
> > +{
> > +	struct device_node *nvcell_node;
> > +	int na, ns, len = 0;
> > +	int ret;
> > +	u8 *tmp;
> > +
> > +	nvcell_node = of_create_node(nvmem_node, node_name);
> > +	if (!nvcell_node) {
> > +		dev_err(priv->dev, "Failed to create %s cell\n", node_name);
> > +		return ERR_PTR(-ENOMEM);
> > +	}
> > +
> > +	na = of_n_addr_cells(nvcell_node);
> > +	ns = of_n_size_cells(nvcell_node);
> > +	tmp = xzalloc((na + ns) * 4);
> > +
> > +	of_write_number(tmp + len, offset, na);
> > +	len += na * 4;
> > +	of_write_number(tmp + len, size, ns);
> > +	len += ns * 4;
> > +
> > +	ret = of_set_property(nvcell_node, "reg", tmp, len, 1);
> > +	kfree(tmp);
> > +	if (ret)
> > +		return ERR_PTR(ret);
> > +
> > +	return nvcell_node;
> > +}
> > +
> > +static int prt_imx6_rfid_fixup(struct device_node *root, void *data)
> > +{
> > +	struct prt_imx6_priv *priv = data;
> > +	const struct prt_machine_data *dcfg = priv->dcfg;
> > +	struct device_node *node, *i2c_node, *tmp_node;
> > +	char *eeprom_node_name, *alias;
> > +	int na, ns, len = 0;
> > +	int ret;
> > +	u8 *tmp;
> > +
> > +	if (!root) {
> > +		dev_err(priv->dev, "Unable to find the root node\n");
> > +		return -ENODEV;
> > +	}
> > +
> > +	alias = basprintf("i2c%d", dcfg->i2c_adapter);
> > +	if (!alias) {
> > +		ret = -ENOMEM;
> > +		goto exit_error;
> > +	}
> > +
> > +	i2c_node = of_find_node_by_alias(root, alias);
> > +	if (!i2c_node) {
> > +		dev_err(priv->dev, "Unsupported i2c adapter\n");
> > +		ret = -ENODEV;
> > +		goto free_alias;
> > +	}
> > +
> > +	eeprom_node_name = basprintf("/eeprom@%x", dcfg->i2c_addr);
> > +	if (!eeprom_node_name) {
> > +		ret = -ENOMEM;
> > +		goto free_alias;
> > +	}
> > +
> > +	node = of_create_node(i2c_node, eeprom_node_name);
> > +	if (!node) {
> > +		dev_err(priv->dev, "Filed to create node %s\n",
> > +			eeprom_node_name);
> 
> s/filed/failed/, multiple times in this patch.

fixed

> > +		ret = -ENOMEM;
> > +		goto free_eeprom;
> > +	}
> > +
> > +	ret = of_property_write_string(node, "compatible", "atmel,24c256");
> > +	if (ret)
> > +		goto free_eeprom;
> > +
> > +	na = of_n_addr_cells(node);
> > +	ns = of_n_size_cells(node);
> > +	tmp = xzalloc((na + ns) * 4);
> > +
> > +	of_write_number(tmp + len, dcfg->i2c_addr, na);
> > +	len += na * 4;
> > +	of_write_number(tmp + len, 0, ns);
> > +	len += ns * 4;
> > +
> > +	ret = of_set_property(node, "reg", tmp, len, 1);
> > +	kfree(tmp);
> > +	if (ret)
> > +		goto free_eeprom;
> > +
> > +	ret = of_property_write_u32(node, "#size-cells", 1);
> > +	if (ret)
> > +		goto free_eeprom;
> > +
> > +	ret = of_property_write_u32(node, "#address-cells", 1);
> > +	if (ret)
> > +		goto free_eeprom;
> > +
> > +	tmp_node = prt_imx6_create_nvmem_cells(priv, node, "/mac-address@0",
> > +					       0x6000, 6);
> > +	if (IS_ERR(tmp_node)) {
> > +		ret = PTR_ERR(tmp_node);
> > +		goto free_eeprom;
> > +	}
> > +
> > +	ret = prt_imx6_nvmem_link_fec(priv, root, tmp_node);
> > +	if (ret)
> > +		goto free_eeprom;
> > +
> > +	tmp_node = prt_imx6_create_nvmem_cells(priv, node, "/serial@6",
> > +					       0x6006, 10);
> > +	if (IS_ERR(tmp_node)) {
> > +		ret = PTR_ERR(tmp_node);
> > +		goto free_eeprom;
> > +	}
> > +
> > +	ret = prt_imx6_nvmem_link_serial(priv, root, tmp_node);
> > +	if (ret)
> > +		goto free_eeprom;
> > +
> > +	return 0;
> > +free_eeprom:
> > +	kfree(eeprom_node_name);
> > +free_alias:
> > +	kfree(alias);
> > +exit_error:
> > +	dev_err(priv->dev, "Failed to apply fixup\n");
> 
> It's always nice to print the error code along with such a message.

fixed

> > +static int prt_imx6_probe(struct device_d *dev)
> > +{
> > +	struct prt_imx6_priv *priv;
> > +	struct param_d *p;
> > +	int ret;
> > +
> > +	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> > +	if (!priv) {
> > +		ret = -ENOMEM;
> > +		goto exit_probe;
> > +	}
> > +
> > +	priv->dev = dev;
> > +
> > +	pr_info("Detected machine type: %s\n",
> > +		of_device_get_match_compatible(priv->dev));
> > +
> > +	ret = prt_imx6_get_id(priv);
> > +	if (ret)
> > +		goto free_priv;
> > +
> > +	pr_info("  HW type:     %d\n", priv->hw_id);
> > +	pr_info("  HW revision: %d\n", priv->hw_rev);
> > +
> > +	ret = prt_imx6_get_dcfg(priv);
> > +	if (ret)
> > +		goto free_priv;
> > +
> > +	if (priv->dcfg->init) {
> > +		ret = priv->dcfg->init(priv);
> > +		if (ret)
> > +			goto free_priv;
> > +	}
> > +
> > +	p = dev_add_param_uint32_ro(dev, "boardrev", &priv->hw_rev, "%u");
> > +	if (IS_ERR(p)) {
> > +		ret = PTR_ERR(p);
> > +		goto free_priv;
> > +	}
> > +
> > +	p = dev_add_param_uint32_ro(dev, "boardid", &priv->hw_id, "%u");
> > +	if (IS_ERR(p)) {
> > +		ret = PTR_ERR(p);
> > +		goto free_priv;
> > +	}
> > +
> > +	ret = prt_imx6_rfid_fixup(of_get_root_node(), priv);
> > +	if (ret)
> > +		goto free_priv;
> > +
> > +	ret = of_register_fixup(prt_imx6_rfid_fixup, priv);
> > +	if (ret) {
> > +		dev_err(dev, "Failed to register fixup\n");
> > +		goto free_priv;
> > +	}
> > +
> > +	return 0;
> > +free_priv:
> > +	kfree(priv);
> > +exit_probe:
> > +	dev_err(dev, "Probe filed\n");

fixed

Regards,
Oleksij

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