[PATCH v6 0/7] clk: clk-axi-clkgen: improvements and some fixes

[PATCH v6 0/7] clk: clk-axi-clkgen: improvements and some fixes

[Nuno Sá via B4 Relay]

This series starts with a small fix and then a bunch of small
improvements. The main change though is to allow detecting of
struct axi_clkgen_limits during probe().

---
Changes in v6:
- Patch 3:
 * Don't add adi-axi-common.h in axi-clkgen (not needed at this point);
- Patch 5: 
 * Add adi-axi-common.h now.

- Link to v5: https://lore.kernel.org/r/20250512-dev-axi-clkgen-limits-v5-0-a86b9a368e05@analog.com
- Link to v4: https://lore.kernel.org/r/20250505-dev-axi-clkgen-limits-v4-0-3ad5124e19e1@analog.com
- Link to v3: https://lore.kernel.org/r/20250421-dev-axi-clkgen-limits-v3-0-4203b4fed2c9@analog.com
- Link to v2: https://lore.kernel.org/r/20250313-dev-axi-clkgen-limits-v2-0-173ae2ad6311@analog.com
- Link to v1: https://lore.kernel.org/r/20250219-dev-axi-clkgen-limits-v1-0-26f7ef14cd9c@analog.com

---
Nuno Sá (7):
      clk: clk-axi-clkgen: fix fpfd_max frequency for zynq
      clk: clk-axi-clkgen: make sure to include mod_devicetable.h
      include: linux: move adi-axi-common.h out of fpga
      include: adi-axi-common: add new helper macros
      clk: clk-axi-clkgen: detect axi_clkgen_limits at runtime
      clk: clk-axi-clkgen move to min/max()
      clk: clk-axi-clkgen: fix coding style issues

 drivers/clk/clk-axi-clkgen.c        | 159 +++++++++++++++++++++++++-----------
 drivers/dma/dma-axi-dmac.c          |   2 +-
 drivers/hwmon/axi-fan-control.c     |   2 +-
 drivers/iio/adc/adi-axi-adc.c       |   3 +-
 drivers/iio/dac/adi-axi-dac.c       |   2 +-
 drivers/pwm/pwm-axi-pwmgen.c        |   2 +-
 drivers/spi/spi-axi-spi-engine.c    |   2 +-
 include/linux/adi-axi-common.h      |  56 +++++++++++++
 include/linux/fpga/adi-axi-common.h |  23 ------
 9 files changed, 174 insertions(+), 77 deletions(-)
---
base-commit: 82f69876ef45ad66c0b114b786c7c6ac0f6a4580
change-id: 20250218-dev-axi-clkgen-limits-63fb0c5ec38b
--

Thanks!
- Nuno Sá

[PATCH v6 1/7] clk: clk-axi-clkgen: fix fpfd_max frequency for zynq

[Nuno Sá via B4 Relay]

From: Nuno Sá <nuno.sa@analog.com>

The fpfd_max frequency should be set to 450 MHz instead of 300 MHz.
Well, it actually depends on the platform speed grade but we are being
conservative for ultrascale so let's be consistent. In a following
change we will set these limits at runtime.

Fixes: 0e646c52cf0e ("clk: Add axi-clkgen driver")
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/clk/clk-axi-clkgen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/clk-axi-clkgen.c b/drivers/clk/clk-axi-clkgen.c
index 934e53a96dddac8ed61dd109cfc188f3a2a0539a..00bf799964c61a3efc042b0f3a9ec3bc8625c9da 100644
--- a/drivers/clk/clk-axi-clkgen.c
+++ b/drivers/clk/clk-axi-clkgen.c
@@ -118,7 +118,7 @@ static const struct axi_clkgen_limits axi_clkgen_zynqmp_default_limits = {
 
 static const struct axi_clkgen_limits axi_clkgen_zynq_default_limits = {
 	.fpfd_min = 10000,
-	.fpfd_max = 300000,
+	.fpfd_max = 450000,
 	.fvco_min = 600000,
 	.fvco_max = 1200000,
 };

-- 
2.49.0

Re: [PATCH v6 1/7] clk: clk-axi-clkgen: fix fpfd_max frequency for zynq

[Stephen Boyd]

Quoting Nuno Sá via B4 Relay (2025-05-19 08:41:06)
> From: Nuno Sá <nuno.sa@analog.com>
> 
> The fpfd_max frequency should be set to 450 MHz instead of 300 MHz.
> Well, it actually depends on the platform speed grade but we are being
> conservative for ultrascale so let's be consistent. In a following
> change we will set these limits at runtime.
> 
> Fixes: 0e646c52cf0e ("clk: Add axi-clkgen driver")
> Signed-off-by: Nuno Sá <nuno.sa@analog.com>
> ---

Applied to clk-next

[PATCH v6 2/7] clk: clk-axi-clkgen: make sure to include mod_devicetable.h

[Nuno Sá via B4 Relay]

From: Nuno Sá <nuno.sa@analog.com>

The mod_devicetable header is the one to be used for struct
of_device_id.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/clk/clk-axi-clkgen.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/clk-axi-clkgen.c b/drivers/clk/clk-axi-clkgen.c
index 00bf799964c61a3efc042b0f3a9ec3bc8625c9da..2a95f9b220234a1245024a821c50e1eb9c104ac9 100644
--- a/drivers/clk/clk-axi-clkgen.c
+++ b/drivers/clk/clk-axi-clkgen.c
@@ -13,6 +13,7 @@
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/module.h>
+#include <linux/mod_devicetable.h>
 #include <linux/err.h>
 
 #define AXI_CLKGEN_V2_REG_RESET		0x40

-- 
2.49.0

Re: [PATCH v6 2/7] clk: clk-axi-clkgen: make sure to include mod_devicetable.h

[Stephen Boyd]

Quoting Nuno Sá via B4 Relay (2025-05-19 08:41:07)
> From: Nuno Sá <nuno.sa@analog.com>
> 
> The mod_devicetable header is the one to be used for struct
> of_device_id.
> 
> Signed-off-by: Nuno Sá <nuno.sa@analog.com>
> ---

Applied to clk-next

[PATCH v6 3/7] include: linux: move adi-axi-common.h out of fpga

[Nuno Sá via B4 Relay]

From: Nuno Sá <nuno.sa@analog.com>

The adi-axi-common.h header has some common defines used in various ADI
IPs. However they are not specific for any fpga manager so it's
questionable for the header to live under include/linux/fpga. Hence
let's just move one directory up and update all users.

Suggested-by: Xu Yilun <yilun.xu@linux.intel.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for IIO
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/dma/dma-axi-dmac.c                | 2 +-
 drivers/hwmon/axi-fan-control.c           | 2 +-
 drivers/iio/adc/adi-axi-adc.c             | 3 +--
 drivers/iio/dac/adi-axi-dac.c             | 2 +-
 drivers/pwm/pwm-axi-pwmgen.c              | 2 +-
 drivers/spi/spi-axi-spi-engine.c          | 2 +-
 include/linux/{fpga => }/adi-axi-common.h | 0
 7 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
index 36943b0c6d603cbe38606b0d7bde02535f529a9a..5b06b0dc67ee12017c165bf815fb7c0e1bf5abd8 100644
--- a/drivers/dma/dma-axi-dmac.c
+++ b/drivers/dma/dma-axi-dmac.c
@@ -6,6 +6,7 @@
  *  Author: Lars-Peter Clausen <lars@metafoo.de>
  */
 
+#include <linux/adi-axi-common.h>
 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/device.h>
@@ -22,7 +23,6 @@
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
-#include <linux/fpga/adi-axi-common.h>
 
 #include <dt-bindings/dma/axi-dmac.h>
 
diff --git a/drivers/hwmon/axi-fan-control.c b/drivers/hwmon/axi-fan-control.c
index 35c862eb158b0909dac64c2e9f51f0f9f0e8bf72..b7bb325c3ad966ed2a93be4dfbf4e20661568509 100644
--- a/drivers/hwmon/axi-fan-control.c
+++ b/drivers/hwmon/axi-fan-control.c
@@ -4,9 +4,9 @@
  *
  * Copyright 2019 Analog Devices Inc.
  */
+#include <linux/adi-axi-common.h>
 #include <linux/bits.h>
 #include <linux/clk.h>
-#include <linux/fpga/adi-axi-common.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/interrupt.h>
diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index c7357601f0f869e57636f00bb1e26c059c3ab15c..87fa18f1ec96782556bdfad08bedb5e7549fb93d 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -6,6 +6,7 @@
  * Copyright 2012-2020 Analog Devices Inc.
  */
 
+#include <linux/adi-axi-common.h>
 #include <linux/bitfield.h>
 #include <linux/cleanup.h>
 #include <linux/clk.h>
@@ -20,8 +21,6 @@
 #include <linux/regmap.h>
 #include <linux/slab.h>
 
-#include <linux/fpga/adi-axi-common.h>
-
 #include <linux/iio/backend.h>
 #include <linux/iio/buffer-dmaengine.h>
 #include <linux/iio/buffer.h>
diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c
index b143f7ed6847277aeb49094627d90e5d95eed71c..581a2fe55a7fb35f1a03f96f3a0e95421d1583e7 100644
--- a/drivers/iio/dac/adi-axi-dac.c
+++ b/drivers/iio/dac/adi-axi-dac.c
@@ -5,6 +5,7 @@
  *
  * Copyright 2016-2024 Analog Devices Inc.
  */
+#include <linux/adi-axi-common.h>
 #include <linux/bitfield.h>
 #include <linux/bits.h>
 #include <linux/cleanup.h>
@@ -23,7 +24,6 @@
 #include <linux/regmap.h>
 #include <linux/units.h>
 
-#include <linux/fpga/adi-axi-common.h>
 #include <linux/iio/backend.h>
 #include <linux/iio/buffer-dmaengine.h>
 #include <linux/iio/buffer.h>
diff --git a/drivers/pwm/pwm-axi-pwmgen.c b/drivers/pwm/pwm-axi-pwmgen.c
index 4259a0db9ff45808eecae28680473292d165d1f6..e720191e74558d15f1b04fa18cf2984299f88809 100644
--- a/drivers/pwm/pwm-axi-pwmgen.c
+++ b/drivers/pwm/pwm-axi-pwmgen.c
@@ -18,10 +18,10 @@
  * - Supports normal polarity. Does not support changing polarity.
  * - On disable, the PWM output becomes low (inactive).
  */
+#include <linux/adi-axi-common.h>
 #include <linux/bits.h>
 #include <linux/clk.h>
 #include <linux/err.h>
-#include <linux/fpga/adi-axi-common.h>
 #include <linux/io.h>
 #include <linux/minmax.h>
 #include <linux/module.h>
diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c
index 7c252126b33ea83fe6a6e80c6cb87499243069f5..d498132f1ff6adf20639bf4a21f1687903934bec 100644
--- a/drivers/spi/spi-axi-spi-engine.c
+++ b/drivers/spi/spi-axi-spi-engine.c
@@ -5,9 +5,9 @@
  *  Author: Lars-Peter Clausen <lars@metafoo.de>
  */
 
+#include <linux/adi-axi-common.h>
 #include <linux/clk.h>
 #include <linux/completion.h>
-#include <linux/fpga/adi-axi-common.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/of.h>
diff --git a/include/linux/fpga/adi-axi-common.h b/include/linux/adi-axi-common.h
similarity index 100%
rename from include/linux/fpga/adi-axi-common.h
rename to include/linux/adi-axi-common.h

-- 
2.49.0

Re: [PATCH v6 3/7] include: linux: move adi-axi-common.h out of fpga

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 429 bytes --]

On Mon, May 19, 2025 at 04:41:08PM +0100, Nuno Sá via B4 Relay wrote:
> From: Nuno Sá <nuno.sa@analog.com>
> 
> The adi-axi-common.h header has some common defines used in various ADI
> IPs. However they are not specific for any fpga manager so it's
> questionable for the header to live under include/linux/fpga. Hence
> let's just move one directory up and update all users.

Acked-by: Mark Brown <broonie@kernel.org>

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Re: [PATCH v6 3/7] include: linux: move adi-axi-common.h out of fpga

[Uwe Kleine-König]

[-- Attachment #1: Type: text/plain, Size: 389 bytes --]

On Mon, May 19, 2025 at 04:41:08PM +0100, Nuno Sá via B4 Relay wrote:
> ...
>  drivers/pwm/pwm-axi-pwmgen.c              | 2 +-

There is nothing scheduled on my side for that driver and the change
looks as expected.

Take my

Acked-by: Uwe Kleine-König <ukleinek@kernel.org>

to get it applied to whatever tree that series will be merged through
(clk?).

Best regards
Uwe

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Re: [PATCH v6 3/7] include: linux: move adi-axi-common.h out of fpga

[Stephen Boyd]

Quoting Nuno Sá via B4 Relay (2025-05-19 08:41:08)
> From: Nuno Sá <nuno.sa@analog.com>
> 
> The adi-axi-common.h header has some common defines used in various ADI
> IPs. However they are not specific for any fpga manager so it's
> questionable for the header to live under include/linux/fpga. Hence
> let's just move one directory up and update all users.
> 
> Suggested-by: Xu Yilun <yilun.xu@linux.intel.com>
> Acked-by: Xu Yilun <yilun.xu@intel.com>
> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for IIO
> Signed-off-by: Nuno Sá <nuno.sa@analog.com>
> ---

Applied to clk-next

[PATCH v6 4/7] include: adi-axi-common: add new helper macros

[Nuno Sá via B4 Relay]

From: Nuno Sá <nuno.sa@analog.com>

Add new helper macros and enums to help identifying the platform and some
characteristics of it at runtime.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
 include/linux/adi-axi-common.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/include/linux/adi-axi-common.h b/include/linux/adi-axi-common.h
index 141ac3f251e6f256526812b9d55cd440a2a46e76..f64f4ad4bedae312ec450bd5fed09ceaedd5397e 100644
--- a/include/linux/adi-axi-common.h
+++ b/include/linux/adi-axi-common.h
@@ -12,6 +12,7 @@
 #define ADI_AXI_COMMON_H_
 
 #define ADI_AXI_REG_VERSION			0x0000
+#define ADI_AXI_REG_FPGA_INFO			0x001C
 
 #define ADI_AXI_PCORE_VER(major, minor, patch)	\
 	(((major) << 16) | ((minor) << 8) | (patch))
@@ -20,4 +21,36 @@
 #define ADI_AXI_PCORE_VER_MINOR(version)	(((version) >> 8) & 0xff)
 #define ADI_AXI_PCORE_VER_PATCH(version)	((version) & 0xff)
 
+#define ADI_AXI_INFO_FPGA_TECH(info)            (((info) >> 24) & 0xff)
+#define ADI_AXI_INFO_FPGA_FAMILY(info)          (((info) >> 16) & 0xff)
+#define ADI_AXI_INFO_FPGA_SPEED_GRADE(info)     (((info) >> 8) & 0xff)
+
+enum adi_axi_fpga_technology {
+	ADI_AXI_FPGA_TECH_UNKNOWN = 0,
+	ADI_AXI_FPGA_TECH_SERIES7,
+	ADI_AXI_FPGA_TECH_ULTRASCALE,
+	ADI_AXI_FPGA_TECH_ULTRASCALE_PLUS,
+};
+
+enum adi_axi_fpga_family {
+	ADI_AXI_FPGA_FAMILY_UNKNOWN = 0,
+	ADI_AXI_FPGA_FAMILY_ARTIX,
+	ADI_AXI_FPGA_FAMILY_KINTEX,
+	ADI_AXI_FPGA_FAMILY_VIRTEX,
+	ADI_AXI_FPGA_FAMILY_ZYNQ,
+};
+
+enum adi_axi_fpga_speed_grade {
+	ADI_AXI_FPGA_SPEED_UNKNOWN      = 0,
+	ADI_AXI_FPGA_SPEED_1    = 10,
+	ADI_AXI_FPGA_SPEED_1L   = 11,
+	ADI_AXI_FPGA_SPEED_1H   = 12,
+	ADI_AXI_FPGA_SPEED_1HV  = 13,
+	ADI_AXI_FPGA_SPEED_1LV  = 14,
+	ADI_AXI_FPGA_SPEED_2    = 20,
+	ADI_AXI_FPGA_SPEED_2L   = 21,
+	ADI_AXI_FPGA_SPEED_2LV  = 22,
+	ADI_AXI_FPGA_SPEED_3    = 30,
+};
+
 #endif /* ADI_AXI_COMMON_H_ */

-- 
2.49.0

Re: [PATCH v6 4/7] include: adi-axi-common: add new helper macros

[Stephen Boyd]

Quoting Nuno Sá via B4 Relay (2025-05-19 08:41:09)
> From: Nuno Sá <nuno.sa@analog.com>
> 
> Add new helper macros and enums to help identifying the platform and some
> characteristics of it at runtime.
> 
> Signed-off-by: Nuno Sá <nuno.sa@analog.com>
> ---

Applied to clk-next

[PATCH v6 5/7] clk: clk-axi-clkgen: detect axi_clkgen_limits at runtime

[Nuno Sá via B4 Relay]

From: Nuno Sá <nuno.sa@analog.com>

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>
---
 drivers/clk/clk-axi-clkgen.c | 65 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 64 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-axi-clkgen.c b/drivers/clk/clk-axi-clkgen.c
index 2a95f9b220234a1245024a821c50e1eb9c104ac9..f4e96394e9c25c817b09ee0c08751147083f19b7 100644
--- 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",

-- 
2.49.0

Re: [PATCH v6 5/7] clk: clk-axi-clkgen: detect axi_clkgen_limits at runtime

[Stephen Boyd]

Quoting Nuno Sá via B4 Relay (2025-05-19 08:41:10)
> From: Nuno Sá <nuno.sa@analog.com>
> 
> 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>
> ---

Applied to clk-next

[PATCH v6 6/7] clk: clk-axi-clkgen move to min/max()

[Nuno Sá via B4 Relay]

From: Nuno Sá <nuno.sa@analog.com>

Instead of using the type versions of min/max(), use the plain ones as
now they are perfectly capable of handling different types like
unsigned and non negative integers that are compiletime constant.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/clk/clk-axi-clkgen.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/clk-axi-clkgen.c b/drivers/clk/clk-axi-clkgen.c
index f4e96394e9c25c817b09ee0c08751147083f19b7..63951209c460f26ed3940879da536e31ae530188 100644
--- a/drivers/clk/clk-axi-clkgen.c
+++ b/drivers/clk/clk-axi-clkgen.c
@@ -147,15 +147,15 @@ static void axi_clkgen_calc_params(const struct axi_clkgen_limits *limits,
 	*best_m = 0;
 	*best_dout = 0;
 
-	d_min = max_t(unsigned long, DIV_ROUND_UP(fin, limits->fpfd_max), 1);
-	d_max = min_t(unsigned long, fin / limits->fpfd_min, 80);
+	d_min = max(DIV_ROUND_UP(fin, limits->fpfd_max), 1);
+	d_max = min(fin / limits->fpfd_min, 80);
 
 again:
 	fvco_min_fract = limits->fvco_min << fract_shift;
 	fvco_max_fract = limits->fvco_max << fract_shift;
 
-	m_min = max_t(unsigned long, DIV_ROUND_UP(fvco_min_fract, fin) * d_min, 1);
-	m_max = min_t(unsigned long, fvco_max_fract * d_max / fin, 64 << fract_shift);
+	m_min = max(DIV_ROUND_UP(fvco_min_fract, fin) * d_min, 1);
+	m_max = min(fvco_max_fract * d_max / fin, 64 << fract_shift);
 
 	for (m = m_min; m <= m_max; m++) {
 		_d_min = max(d_min, DIV_ROUND_UP(fin * m, fvco_max_fract));

-- 
2.49.0

Re: [PATCH v6 6/7] clk: clk-axi-clkgen move to min/max()

[Stephen Boyd]

Quoting Nuno Sá via B4 Relay (2025-05-19 08:41:11)
> From: Nuno Sá <nuno.sa@analog.com>
> 
> Instead of using the type versions of min/max(), use the plain ones as
> now they are perfectly capable of handling different types like
> unsigned and non negative integers that are compiletime constant.
> 
> Signed-off-by: Nuno Sá <nuno.sa@analog.com>
> ---

Applied to clk-next

[PATCH v6 7/7] clk: clk-axi-clkgen: fix coding style issues

[Nuno Sá via B4 Relay]

From: Nuno Sá <nuno.sa@analog.com>

This is just cosmetics and so no functional changes intended.

While at it, sort header in alphabetical order.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
 drivers/clk/clk-axi-clkgen.c | 81 ++++++++++++++++++++++----------------------
 1 file changed, 41 insertions(+), 40 deletions(-)

diff --git a/drivers/clk/clk-axi-clkgen.c b/drivers/clk/clk-axi-clkgen.c
index 63951209c460f26ed3940879da536e31ae530188..2bb52c4dc7be5167380c1d158d96c7618d16c558 100644
--- a/drivers/clk/clk-axi-clkgen.c
+++ b/drivers/clk/clk-axi-clkgen.c
@@ -8,15 +8,15 @@
 
 #include <linux/adi-axi-common.h>
 #include <linux/bits.h>
-#include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
-#include <linux/slab.h>
+#include <linux/err.h>
 #include <linux/io.h>
-#include <linux/of.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
-#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
 
 #define AXI_CLKGEN_V2_REG_RESET		0x40
 #define AXI_CLKGEN_V2_REG_CLKSEL	0x44
@@ -96,7 +96,7 @@ static uint32_t axi_clkgen_lookup_filter(unsigned int m)
 	}
 }
 
-static const uint32_t axi_clkgen_lock_table[] = {
+static const u32 axi_clkgen_lock_table[] = {
 	0x060603e8, 0x060603e8, 0x080803e8, 0x0b0b03e8,
 	0x0e0e03e8, 0x111103e8, 0x131303e8, 0x161603e8,
 	0x191903e8, 0x1c1c03e8, 0x1f1f0384, 0x1f1f0339,
@@ -108,7 +108,7 @@ static const uint32_t axi_clkgen_lock_table[] = {
 	0x1f1f012c, 0x1f1f0113, 0x1f1f0113, 0x1f1f0113,
 };
 
-static uint32_t axi_clkgen_lookup_lock(unsigned int m)
+static u32 axi_clkgen_lookup_lock(unsigned int m)
 {
 	if (m < ARRAY_SIZE(axi_clkgen_lock_table))
 		return axi_clkgen_lock_table[m];
@@ -130,8 +130,9 @@ static const struct axi_clkgen_limits axi_clkgen_zynq_default_limits = {
 };
 
 static void axi_clkgen_calc_params(const struct axi_clkgen_limits *limits,
-	unsigned long fin, unsigned long fout,
-	unsigned int *best_d, unsigned int *best_m, unsigned int *best_dout)
+				   unsigned long fin, unsigned long fout,
+				   unsigned int *best_d, unsigned int *best_m,
+				   unsigned int *best_dout)
 {
 	unsigned long d, d_min, d_max, _d_min, _d_max;
 	unsigned long m, m_min, m_max;
@@ -198,9 +199,9 @@ struct axi_clkgen_div_params {
 };
 
 static void axi_clkgen_calc_clk_params(unsigned int divider,
-	unsigned int frac_divider, struct axi_clkgen_div_params *params)
+				       unsigned int frac_divider,
+				       struct axi_clkgen_div_params *params)
 {
-
 	memset(params, 0x0, sizeof(*params));
 
 	if (divider == 1) {
@@ -228,7 +229,7 @@ static void axi_clkgen_calc_clk_params(unsigned int divider,
 		if (params->edge == 0 || frac_divider == 1)
 			params->low--;
 		if (((params->edge == 0) ^ (frac_divider == 1)) ||
-			(divider == 2 && frac_divider == 1))
+		    (divider == 2 && frac_divider == 1))
 			params->frac_wf_f = 1;
 
 		params->frac_phase = params->edge * 4 + frac_divider / 2;
@@ -236,13 +237,13 @@ static void axi_clkgen_calc_clk_params(unsigned int divider,
 }
 
 static void axi_clkgen_write(struct axi_clkgen *axi_clkgen,
-	unsigned int reg, unsigned int val)
+			     unsigned int reg, unsigned int val)
 {
 	writel(val, axi_clkgen->base + reg);
 }
 
 static void axi_clkgen_read(struct axi_clkgen *axi_clkgen,
-	unsigned int reg, unsigned int *val)
+			    unsigned int reg, unsigned int *val)
 {
 	*val = readl(axi_clkgen->base + reg);
 }
@@ -263,7 +264,7 @@ static int axi_clkgen_wait_non_busy(struct axi_clkgen *axi_clkgen)
 }
 
 static int axi_clkgen_mmcm_read(struct axi_clkgen *axi_clkgen,
-	unsigned int reg, unsigned int *val)
+				unsigned int reg, unsigned int *val)
 {
 	unsigned int reg_val;
 	int ret;
@@ -287,7 +288,8 @@ static int axi_clkgen_mmcm_read(struct axi_clkgen *axi_clkgen,
 }
 
 static int axi_clkgen_mmcm_write(struct axi_clkgen *axi_clkgen,
-	unsigned int reg, unsigned int val, unsigned int mask)
+				 unsigned int reg, unsigned int val,
+				 unsigned int mask)
 {
 	unsigned int reg_val = 0;
 	int ret;
@@ -308,8 +310,7 @@ static int axi_clkgen_mmcm_write(struct axi_clkgen *axi_clkgen,
 	return 0;
 }
 
-static void axi_clkgen_mmcm_enable(struct axi_clkgen *axi_clkgen,
-	bool enable)
+static void axi_clkgen_mmcm_enable(struct axi_clkgen *axi_clkgen, bool enable)
 {
 	unsigned int val = AXI_CLKGEN_V2_RESET_ENABLE;
 
@@ -325,31 +326,31 @@ static struct axi_clkgen *clk_hw_to_axi_clkgen(struct clk_hw *clk_hw)
 }
 
 static void axi_clkgen_set_div(struct axi_clkgen *axi_clkgen,
-	unsigned int reg1, unsigned int reg2, unsigned int reg3,
-	struct axi_clkgen_div_params *params)
+			       unsigned int reg1, unsigned int reg2,
+			       unsigned int reg3,
+			       struct axi_clkgen_div_params *params)
 {
 	axi_clkgen_mmcm_write(axi_clkgen, reg1,
-		(params->high << 6) | params->low, 0xefff);
+			      (params->high << 6) | params->low, 0xefff);
 	axi_clkgen_mmcm_write(axi_clkgen, reg2,
-		(params->frac << 12) | (params->frac_en << 11) |
-		(params->frac_wf_r << 10) | (params->edge << 7) |
-		(params->nocount << 6), 0x7fff);
+			      (params->frac << 12) | (params->frac_en << 11) |
+			      (params->frac_wf_r << 10) | (params->edge << 7) |
+			      (params->nocount << 6), 0x7fff);
 	if (reg3 != 0) {
 		axi_clkgen_mmcm_write(axi_clkgen, reg3,
-			(params->frac_phase << 11) | (params->frac_wf_f << 10), 0x3c00);
+				      (params->frac_phase << 11) | (params->frac_wf_f << 10),
+				      0x3c00);
 	}
 }
 
-static int axi_clkgen_set_rate(struct clk_hw *clk_hw,
-	unsigned long rate, unsigned long parent_rate)
+static int axi_clkgen_set_rate(struct clk_hw *clk_hw, unsigned long rate,
+			       unsigned long parent_rate)
 {
 	struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw);
 	const struct axi_clkgen_limits *limits = &axi_clkgen->limits;
 	unsigned int d, m, dout;
 	struct axi_clkgen_div_params params;
-	uint32_t power = 0;
-	uint32_t filter;
-	uint32_t lock;
+	u32 power = 0, filter, lock;
 
 	if (parent_rate == 0 || rate == 0)
 		return -EINVAL;
@@ -369,22 +370,22 @@ static int axi_clkgen_set_rate(struct clk_hw *clk_hw,
 
 	axi_clkgen_calc_clk_params(dout >> 3, dout & 0x7, &params);
 	axi_clkgen_set_div(axi_clkgen,  MMCM_REG_CLKOUT0_1, MMCM_REG_CLKOUT0_2,
-		MMCM_REG_CLKOUT5_2, &params);
+			   MMCM_REG_CLKOUT5_2, &params);
 
 	axi_clkgen_calc_clk_params(d, 0, &params);
 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_CLK_DIV,
-		(params.edge << 13) | (params.nocount << 12) |
-		(params.high << 6) | params.low, 0x3fff);
+			      (params.edge << 13) | (params.nocount << 12) |
+			      (params.high << 6) | params.low, 0x3fff);
 
 	axi_clkgen_calc_clk_params(m >> 3, m & 0x7, &params);
 	axi_clkgen_set_div(axi_clkgen,  MMCM_REG_CLK_FB1, MMCM_REG_CLK_FB2,
-		MMCM_REG_CLKOUT6_2, &params);
+			   MMCM_REG_CLKOUT6_2, &params);
 
 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_LOCK1, lock & 0x3ff, 0x3ff);
 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_LOCK2,
-		(((lock >> 16) & 0x1f) << 10) | 0x1, 0x7fff);
+			      (((lock >> 16) & 0x1f) << 10) | 0x1, 0x7fff);
 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_LOCK3,
-		(((lock >> 24) & 0x1f) << 10) | 0x3e9, 0x7fff);
+			      (((lock >> 24) & 0x1f) << 10) | 0x3e9, 0x7fff);
 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_FILTER1, filter >> 16, 0x9900);
 	axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_FILTER2, filter, 0x9900);
 
@@ -413,7 +414,7 @@ static int axi_clkgen_determine_rate(struct clk_hw *hw,
 }
 
 static unsigned int axi_clkgen_get_div(struct axi_clkgen *axi_clkgen,
-	unsigned int reg1, unsigned int reg2)
+				       unsigned int reg1, unsigned int reg2)
 {
 	unsigned int val1, val2;
 	unsigned int div;
@@ -440,7 +441,7 @@ static unsigned int axi_clkgen_get_div(struct axi_clkgen *axi_clkgen,
 }
 
 static unsigned long axi_clkgen_recalc_rate(struct clk_hw *clk_hw,
-	unsigned long parent_rate)
+					    unsigned long parent_rate)
 {
 	struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw);
 	unsigned int d, m, dout;
@@ -448,9 +449,9 @@ static unsigned long axi_clkgen_recalc_rate(struct clk_hw *clk_hw,
 	unsigned int val;
 
 	dout = axi_clkgen_get_div(axi_clkgen, MMCM_REG_CLKOUT0_1,
-		MMCM_REG_CLKOUT0_2);
+				  MMCM_REG_CLKOUT0_2);
 	m = axi_clkgen_get_div(axi_clkgen, MMCM_REG_CLK_FB1,
-		MMCM_REG_CLK_FB2);
+			       MMCM_REG_CLK_FB2);
 
 	axi_clkgen_mmcm_read(axi_clkgen, MMCM_REG_CLK_DIV, &val);
 	if (val & MMCM_CLK_DIV_NOCOUNT)
@@ -623,7 +624,7 @@ static int axi_clkgen_probe(struct platform_device *pdev)
 
 	clk_name = pdev->dev.of_node->name;
 	of_property_read_string(pdev->dev.of_node, "clock-output-names",
-		&clk_name);
+				&clk_name);
 
 	init.name = clk_name;
 	init.ops = &axi_clkgen_ops;

-- 
2.49.0

Re: [PATCH v6 7/7] clk: clk-axi-clkgen: fix coding style issues

[Stephen Boyd]

Quoting Nuno Sá via B4 Relay (2025-05-19 08:41:12)
> From: Nuno Sá <nuno.sa@analog.com>
> 
> This is just cosmetics and so no functional changes intended.
> 
> While at it, sort header in alphabetical order.
> 
> Signed-off-by: Nuno Sá <nuno.sa@analog.com>
> ---

Applied to clk-next

Re: [PATCH v6 0/7] clk: clk-axi-clkgen: improvements and some fixes

[David Lechner]

On 5/19/25 10:41 AM, Nuno Sá via B4 Relay wrote:
> This series starts with a small fix and then a bunch of small
> improvements. The main change though is to allow detecting of
> struct axi_clkgen_limits during probe().
> 
> ---
Reviewed-by: David Lechner <dlechner@baylibre.com>