Re: [PATCH v4 03/39] mmc: msm_sdhci: use modern clock handling

On Thu, Feb 15, 2024 at 08:52:21PM +0000, Caleb Connolly wrote:

static int msm_sdc_clk_init(struct udevice *dev) {

• int node = dev_of_offset(dev);
• uint clk_rate = fdtdec_get_uint(gd->fdt_blob, node, "clock-frequency",

• 			400000);
  

• uint clkd[2]; /* clk_id and clk_no */
• int clk_offset;
• struct udevice *clk_dev;
• struct clk clk;
• int ret;

• struct msm_sdhc *prv = dev_get_priv(dev);
• ofnode node = dev_ofnode(dev);
• uint clk_rate;
• int ret, i = 0, n_clks;
• const char *clk_name;

• ret = fdtdec_get_int_array(gd->fdt_blob, node, "clock", clkd, 2);

• ret = ofnode_read_u32(node, "clock-frequency", &clk_rate); if (ret)

• return ret;
  

• clk_rate = 400000;
  
  

• clk_offset = fdt_node_offset_by_phandle(gd->fdt_blob, clkd[0]);
• if (clk_offset < 0)

• return clk_offset;
  

• ret = uclass_get_device_by_of_offset(UCLASS_CLK, clk_offset, &clk_dev);
• if (ret)

• ret = clk_get_bulk(dev, &prv->clks);
• if (ret) {

• log_warning("Couldn't get mmc clocks: %d\n", ret);
  

  return ret;
• }

• clk.id = clkd[1];
• ret = clk_request(clk_dev, &clk);
• if (ret < 0)

• ret = clk_enable_bulk(&prv->clks);
• if (ret) {

• log_warning("Couldn't enable mmc clocks: %d\n", ret);
  

  return ret;
• }

• ret = clk_set_rate(&clk, clk_rate);
• if (ret < 0)

• return ret;
  

• /* If clock-names is unspecified, then the first clock is the core clock */
• if (!ofnode_get_property(node, "clock-names", &n_clks)) {

• if (!clk_set_rate(&prv->clks.clks[0], clk_rate)) {
  

• 	log_warning("Couldn't set core clock rate: %d\n", ret);
  

s/ret/clk_rate/

regards, dan carpenter

• 	return -EINVAL;
  

• }
  

• }

• /* Find the index of the "core" clock */

• while (i < n_clks) {

• ofnode_read_string_index(node, "clock-names", i, &clk_name);
  

• if (!strcmp(clk_name, "core"))
  

• 	break;
  

• i++;
  

• }

• if (i >= prv->clks.count) {

• log_warning("Couldn't find core clock (index %d but only have %d clocks)\n", i,
  

•        prv->clks.count);
  

• return -EINVAL;
  

• }

• /* The clock is already enabled by the clk_bulk above */

• ret = clk_set_rate(&prv->clks.clks[i], clk_rate);

• /* If we get a rate of 0 then something has probably gone wrong. */

• if (ret == 0) {

• log_warning("Couldn't set core clock rate to %u! Driver returned rate of 0\n", clk_rate);
  

• return -EINVAL;
  

• }

  return 0;

}