clk: clk-axi-clkgen: detect axi_clkgen_limits at runtime

This patch adds support for setting the limits in struct
axi_clkgen_limits  in accordance with fpga speed grade, voltage,
technology and family. This new information is extracted from
two new registers implemented in the ip core that are only available
for core versions higher or equal to 4.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20250519-dev-axi-clkgen-limits-v6-5-bc4b3b61d1d4@analog.com
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/clk-axi-clkgen.c b/drivers/clk/clk-axi-clkgen.c
index 2a95f9b220234a1245024a821c50e1eb9c104ac9..f4e96394e9c25c817b09ee0c08751147083f19b7 100644 (file)
--- a/drivers/clk/clk-axi-clkgen.c
+++ b/drivers/clk/clk-axi-clkgen.c
@@ -6,6 +6,8 @@
  *  Author: Lars-Peter Clausen <lars@metafoo.de>
  */
 
+#include <linux/adi-axi-common.h>
+#include <linux/bits.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
@@ -29,6 +31,9 @@
 
 #define AXI_CLKGEN_V2_DRP_STATUS_BUSY  BIT(16)
 
+#define ADI_CLKGEN_REG_FPGA_VOLTAGE            0x0140
+#define ADI_CLKGEN_INFO_FPGA_VOLTAGE(val)      ((val) & GENMASK(15, 0))
+
 #define MMCM_REG_CLKOUT5_2     0x07
 #define MMCM_REG_CLKOUT0_1     0x08
 #define MMCM_REG_CLKOUT0_2     0x09
@@ -497,6 +502,54 @@ static u8 axi_clkgen_get_parent(struct clk_hw *clk_hw)
        return parent;
 }
 
+static int axi_clkgen_setup_limits(struct axi_clkgen *axi_clkgen,
+                                  struct device *dev)
+{
+       unsigned int tech, family, speed_grade, reg_value;
+
+       axi_clkgen_read(axi_clkgen, ADI_AXI_REG_FPGA_INFO, &reg_value);
+       tech = ADI_AXI_INFO_FPGA_TECH(reg_value);
+       family = ADI_AXI_INFO_FPGA_FAMILY(reg_value);
+       speed_grade = ADI_AXI_INFO_FPGA_SPEED_GRADE(reg_value);
+
+       axi_clkgen->limits.fpfd_min = 10000;
+       axi_clkgen->limits.fvco_min = 600000;
+
+       switch (speed_grade) {
+       case ADI_AXI_FPGA_SPEED_1 ... ADI_AXI_FPGA_SPEED_1LV:
+               axi_clkgen->limits.fvco_max = 1200000;
+               axi_clkgen->limits.fpfd_max = 450000;
+               break;
+       case ADI_AXI_FPGA_SPEED_2 ... ADI_AXI_FPGA_SPEED_2LV:
+               axi_clkgen->limits.fvco_max = 1440000;
+               axi_clkgen->limits.fpfd_max = 500000;
+               if (family == ADI_AXI_FPGA_FAMILY_KINTEX || family == ADI_AXI_FPGA_FAMILY_ARTIX) {
+                       axi_clkgen_read(axi_clkgen, ADI_CLKGEN_REG_FPGA_VOLTAGE,
+                                       &reg_value);
+                       if (ADI_CLKGEN_INFO_FPGA_VOLTAGE(reg_value) < 950) {
+                               axi_clkgen->limits.fvco_max = 1200000;
+                               axi_clkgen->limits.fpfd_max = 450000;
+                       }
+               }
+               break;
+       case ADI_AXI_FPGA_SPEED_3:
+               axi_clkgen->limits.fvco_max = 1600000;
+               axi_clkgen->limits.fpfd_max = 550000;
+               break;
+       default:
+               return dev_err_probe(dev, -ENODEV, "Unknown speed grade %d\n",
+                                    speed_grade);
+       };
+
+       /* Overwrite vco limits for ultrascale+ */
+       if (tech == ADI_AXI_FPGA_TECH_ULTRASCALE_PLUS) {
+               axi_clkgen->limits.fvco_max = 1600000;
+               axi_clkgen->limits.fvco_min = 800000;
+       }
+
+       return 0;
+}
+
 static const struct clk_ops axi_clkgen_ops = {
        .recalc_rate = axi_clkgen_recalc_rate,
        .determine_rate = axi_clkgen_determine_rate,
@@ -511,6 +564,7 @@ static int axi_clkgen_probe(struct platform_device *pdev)
 {
        const struct axi_clkgen_limits *dflt_limits;
        struct axi_clkgen *axi_clkgen;
+       unsigned int pcore_version;
        struct clk_init_data init;
        const char *parent_names[2];
        const char *clk_name;
@@ -556,7 +610,16 @@ static int axi_clkgen_probe(struct platform_device *pdev)
                        return -EINVAL;
        }
 
-       memcpy(&axi_clkgen->limits, dflt_limits, sizeof(axi_clkgen->limits));
+       axi_clkgen_read(axi_clkgen, ADI_AXI_REG_VERSION, &pcore_version);
+
+       if (ADI_AXI_PCORE_VER_MAJOR(pcore_version) > 0x04) {
+               ret = axi_clkgen_setup_limits(axi_clkgen, &pdev->dev);
+               if (ret)
+                       return ret;
+       } else {
+               memcpy(&axi_clkgen->limits, dflt_limits,
+                      sizeof(axi_clkgen->limits));
+       }
 
        clk_name = pdev->dev.of_node->name;
        of_property_read_string(pdev->dev.of_node, "clock-output-names",