[PATCH V12 0/3] Add PWM support for IPQ chipsets

[PATCH V12 0/3] Add PWM support for IPQ chipsets

[Devi Priya]

Add PWM driver and binding support for IPQ chipsets.
Also, add support for pwm in ipq6018.

Devi Priya (3):
  pwm: driver for qualcomm ipq6018 pwm block
  dt-bindings: pwm: add IPQ6018 binding
  arm64: dts: ipq6018: add pwm node

 .../devicetree/bindings/pwm/ipq-pwm.yaml      |  53 ++++
 arch/arm64/boot/dts/qcom/ipq6018.dtsi         |  15 +-
 drivers/pwm/Kconfig                           |  12 +
 drivers/pwm/Makefile                          |   1 +
 drivers/pwm/pwm-ipq.c                         | 282 ++++++++++++++++++
 5 files changed, 362 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
 create mode 100644 drivers/pwm/pwm-ipq.c


base-commit: 940fcc189c51032dd0282cbee4497542c982ac59
-- 
2.34.1

[PATCH V12 1/3] pwm: driver for qualcomm ipq6018 pwm block

[Devi Priya]

Driver for the PWM block in Qualcomm IPQ6018 line of SoCs. Based on
driver from downstream Codeaurora kernel tree. Removed support for older
(V1) variants because I have no access to that hardware.

Tested on IPQ6010 based hardware.

Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
---
V12:

  Fix the below clang warning for overflow check reported by kernel test robot
  drivers/pwm/pwm-ipq.c:122:11: warning: result of comparison of constant 16000000000 
  with expression of type 'unsigned long' is always false [-Wtautological-constant-out-of-range-compare]
>>            if (rate > 16ULL * GIGA)

v11:

Address comment from Uwe Kleine-König:

  Drop redundant registers field comments

  Fix period limit check in .apply

  Clarify the comment explaining skip of pre_div > pwm_div values

  Add explicit check for clock rate within limit

  Add comment explaining the selection of initial pre_div

  Use pwm_div division with remainder instead of separate diff calculation

  Round up duty_cycle calculation in .get_state

v10:

  Restore round up in pwm_div calculation; otherwise diff is always <=
  0, so only bingo match works

  Don't overwrite min_diff on every loop iteration

v9:

Address comment from Uwe Kleine-König:

  Use period_ns*rate in dividers calculation for better accuracy

  Round down pre_div and pwm_div

  Add a comment explaining why pwm_div can't underflow

  Add a comment explaining why pre_div > pwm_div end the search loop

  Drop 'CFG_' from register macros

  Rename to_ipq_pwm_chip() to ipq_pwm_from_chip()

  Change bare 'unsigned' to 'unsigned int'

  Clarify the comment on separate REG1 write for enable/disable

  Round up the period value in .get_state

  Use direct readl/writel so no need to check for regmap errors

v7:

  Change 'offset' to 'reg' for the tcsr offset (Rob)

  Drop clock name; there is only one clock (Bjorn)

  Simplify probe failure code path (Bjorn)

v6:

Address Uwe Kleine-König review comments:

  Drop IPQ_PWM_MAX_DEVICES

  Rely on assigned-clock-rates; drop IPQ_PWM_CLK_SRC_FREQ

  Simplify register offset calculation

  Calculate duty cycle more precisely

  Refuse to set inverted polarity

  Drop redundant IPQ_PWM_REG1_ENABLE bit clear

  Remove x1000 factor in pwm_div calculation, use rate directly, and round up

  Choose initial pre_div such that pwm_div < IPQ_PWM_MAX_DIV

  Ensure pre_div <= pwm_div

  Rename close_ to best_

  Explain in comment why effective_div doesn't overflow

  Limit pwm_div to IPQ_PWM_MAX_DIV - 1 to allow 100% duty cycle

  Disable clock only after pwmchip_remove()

  const pwm_ops

Other changes:

  Add missing linux/bitfield.h header include (kernel test robot)

  Adjust code for PWM device node under TCSR (Rob Herring)

v5:

Use &tcsr_q6 syscon to access registers (Bjorn Andersson)

Address Uwe Kleine-König review comments:

  Implement .get_state()

  Add IPQ_PWM_ prefix to local macros

  Use GENMASK/BIT/FIELD_PREP for register fields access

  Make type of config_div_and_duty() parameters consistent

  Derive IPQ_PWM_MIN_PERIOD_NS from IPQ_PWM_CLK_SRC_FREQ

  Integrate enable/disable into config_div_and_duty() to save register read,
  and reduce frequency glitch on update

  Use min() instead of min_t()

  Fix comment format

  Use dev_err_probe() to indicate probe step failure

  Add missing clk_disable_unprepare() in .remove

  Don't set .owner

v4:

  Use div64_u64() to fix link for 32-bit targets ((kernel test robot
  <lkp@intel.com>, Uwe Kleine-König)

v3:

  s/qcom,pwm-ipq6018/qcom,ipq6018-pwm/ (Rob Herring)

  Fix integer overflow on 32-bit targets (kernel test robot <lkp@intel.com>)

v2:

Address Uwe Kleine-König review comments:

  Fix period calculation when out of range

  Don't set period larger than requested

  Remove PWM disable on configuration change

  Implement .apply instead of non-atomic .config/.enable/.disable

  Don't modify PWM on .request/.free

  Check pwm_div underflow

  Fix various code and comment formatting issues

Other changes:

  Use u64 divisor safe division

  Remove now empty .request/.free

 drivers/pwm/Kconfig   |  12 ++
 drivers/pwm/Makefile  |   1 +
 drivers/pwm/pwm-ipq.c | 282 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 295 insertions(+)
 create mode 100644 drivers/pwm/pwm-ipq.c

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 8ebcddf91f7b..c2d51680823a 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -282,6 +282,18 @@ config PWM_INTEL_LGM
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-intel-lgm.
 
+config PWM_IPQ
+	tristate "IPQ PWM support"
+	depends on ARCH_QCOM || COMPILE_TEST
+	depends on HAVE_CLK && HAS_IOMEM
+	help
+	  Generic PWM framework driver for IPQ PWM block which supports
+	  4 pwm channels. Each of the these channels can be configured
+	  independent of each other.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pwm-ipq.
+
 config PWM_IQS620A
 	tristate "Azoteq IQS620A PWM support"
 	depends on MFD_IQS62X || COMPILE_TEST
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index c822389c2a24..1b69e8cb2b91 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_PWM_IMX1)		+= pwm-imx1.o
 obj-$(CONFIG_PWM_IMX27)		+= pwm-imx27.o
 obj-$(CONFIG_PWM_IMX_TPM)	+= pwm-imx-tpm.o
 obj-$(CONFIG_PWM_INTEL_LGM)	+= pwm-intel-lgm.o
+obj-$(CONFIG_PWM_IPQ)		+= pwm-ipq.o
 obj-$(CONFIG_PWM_IQS620A)	+= pwm-iqs620a.o
 obj-$(CONFIG_PWM_JZ4740)	+= pwm-jz4740.o
 obj-$(CONFIG_PWM_KEEMBAY)	+= pwm-keembay.o
diff --git a/drivers/pwm/pwm-ipq.c b/drivers/pwm/pwm-ipq.c
new file mode 100644
index 000000000000..5dbe46bb56d6
--- /dev/null
+++ b/drivers/pwm/pwm-ipq.c
@@ -0,0 +1,282 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/*
+ * Copyright (c) 2016-2017, 2020 The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/math64.h>
+#include <linux/of_device.h>
+#include <linux/bitfield.h>
+#include <linux/units.h>
+
+/* The frequency range supported is 1 Hz to clock rate */
+#define IPQ_PWM_MAX_PERIOD_NS	((u64)NSEC_PER_SEC)
+
+/*
+ * The max value specified for each field is based on the number of bits
+ * in the pwm control register for that field
+ */
+#define IPQ_PWM_MAX_DIV		0xFFFF
+
+/*
+ * Two 32-bit registers for each PWM: REG0, and REG1.
+ * Base offset for PWM #i is at 8 * #i.
+ */
+#define IPQ_PWM_REG0			0
+#define IPQ_PWM_REG0_PWM_DIV		GENMASK(15, 0)
+#define IPQ_PWM_REG0_HI_DURATION	GENMASK(31, 16)
+
+#define IPQ_PWM_REG1			4
+#define IPQ_PWM_REG1_PRE_DIV		GENMASK(15, 0)
+/*
+ * Enable bit is set to enable output toggling in pwm device.
+ * Update bit is set to reflect the changed divider and high duration
+ * values in register.
+ */
+#define IPQ_PWM_REG1_UPDATE		BIT(30)
+#define IPQ_PWM_REG1_ENABLE		BIT(31)
+
+struct ipq_pwm_chip {
+	struct pwm_chip chip;
+	struct clk *clk;
+	void __iomem *mem;
+};
+
+static struct ipq_pwm_chip *ipq_pwm_from_chip(struct pwm_chip *chip)
+{
+	return container_of(chip, struct ipq_pwm_chip, chip);
+}
+
+static unsigned int ipq_pwm_reg_read(struct pwm_device *pwm, unsigned int reg)
+{
+	struct ipq_pwm_chip *ipq_chip = ipq_pwm_from_chip(pwm->chip);
+	unsigned int off = 8 * pwm->hwpwm + reg;
+
+	return readl(ipq_chip->mem + off);
+}
+
+static void ipq_pwm_reg_write(struct pwm_device *pwm, unsigned int reg,
+			      unsigned int val)
+{
+	struct ipq_pwm_chip *ipq_chip = ipq_pwm_from_chip(pwm->chip);
+	unsigned int off = 8 * pwm->hwpwm + reg;
+
+	writel(val, ipq_chip->mem + off);
+}
+
+static void config_div_and_duty(struct pwm_device *pwm, unsigned int pre_div,
+				unsigned int pwm_div, unsigned long rate, u64 duty_ns,
+				bool enable)
+{
+	unsigned long hi_dur;
+	unsigned long val = 0;
+
+	/*
+	 * high duration = pwm duty * (pwm div + 1)
+	 * pwm duty = duty_ns / period_ns
+	 */
+	hi_dur = div64_u64(duty_ns * rate, (pre_div + 1) * NSEC_PER_SEC);
+
+	val = FIELD_PREP(IPQ_PWM_REG0_HI_DURATION, hi_dur) |
+		FIELD_PREP(IPQ_PWM_REG0_PWM_DIV, pwm_div);
+	ipq_pwm_reg_write(pwm, IPQ_PWM_REG0, val);
+
+	val = FIELD_PREP(IPQ_PWM_REG1_PRE_DIV, pre_div);
+	ipq_pwm_reg_write(pwm, IPQ_PWM_REG1, val);
+
+	/* PWM enable toggle needs a separate write to REG1 */
+	val |= IPQ_PWM_REG1_UPDATE;
+	if (enable)
+		val |= IPQ_PWM_REG1_ENABLE;
+	ipq_pwm_reg_write(pwm, IPQ_PWM_REG1, val);
+}
+
+static int ipq_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			 const struct pwm_state *state)
+{
+	struct ipq_pwm_chip *ipq_chip = ipq_pwm_from_chip(chip);
+	unsigned int pre_div, pwm_div, best_pre_div, best_pwm_div;
+	unsigned long rate = clk_get_rate(ipq_chip->clk);
+	u64 period_ns, duty_ns, period_rate;
+	u64 min_diff;
+
+	if (state->polarity != PWM_POLARITY_NORMAL)
+		return -EINVAL;
+
+	if (state->period < DIV64_U64_ROUND_UP(NSEC_PER_SEC, rate))
+		return -ERANGE;
+
+	period_ns = min(state->period, IPQ_PWM_MAX_PERIOD_NS);
+	duty_ns = min(state->duty_cycle, period_ns);
+
+	/*
+	 * period_ns is 1G or less. As long as rate is less than 16 GHz,
+	 * period_rate does not overflow. Make that explicit.
+	 */
+	if ((unsigned long long)rate > 16ULL * GIGA)
+		return -EINVAL;
+	period_rate = period_ns * rate;
+	best_pre_div = IPQ_PWM_MAX_DIV;
+	best_pwm_div = IPQ_PWM_MAX_DIV;
+	/*
+	 * We don't need to consider pre_div values smaller than
+	 *
+	 *                              period_rate
+	 *  pre_div_min := ------------------------------------
+	 *                 NSEC_PER_SEC * (IPQ_PWM_MAX_DIV + 1)
+	 *
+	 * because pre_div = pre_div_min results in a better
+	 * approximation.
+	 */
+	pre_div = div64_u64(period_rate,
+			    (u64)NSEC_PER_SEC * (IPQ_PWM_MAX_DIV + 1));
+	min_diff = period_rate;
+
+	for (; pre_div <= IPQ_PWM_MAX_DIV; pre_div++) {
+		u64 remainder;
+
+		pwm_div = div64_u64_rem(period_rate,
+					(u64)NSEC_PER_SEC * (pre_div + 1), &remainder);
+		/* pwm_div is unsigned; the check below catches underflow */
+		pwm_div--;
+
+		/*
+		 * Swapping values for pre_div and pwm_div produces the same
+		 * period length. So we can skip all settings with pre_div >
+		 * pwm_div which results in bigger constraints for selecting
+		 * the duty_cycle than with the two values swapped.
+		 */
+		if (pre_div > pwm_div)
+			break;
+
+		/*
+		 * Make sure we can do 100% duty cycle where
+		 * hi_dur == pwm_div + 1
+		 */
+		if (pwm_div > IPQ_PWM_MAX_DIV - 1)
+			continue;
+
+		if (remainder < min_diff) {
+			best_pre_div = pre_div;
+			best_pwm_div = pwm_div;
+			min_diff = remainder;
+
+			if (min_diff == 0) /* bingo */
+				break;
+		}
+	}
+
+	/* config divider values for the closest possible frequency */
+	config_div_and_duty(pwm, best_pre_div, best_pwm_div,
+			    rate, duty_ns, state->enabled);
+
+	return 0;
+}
+
+static int ipq_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
+			     struct pwm_state *state)
+{
+	struct ipq_pwm_chip *ipq_chip = ipq_pwm_from_chip(chip);
+	unsigned long rate = clk_get_rate(ipq_chip->clk);
+	unsigned int pre_div, pwm_div, hi_dur;
+	u64 effective_div, hi_div;
+	u32 reg0, reg1;
+
+	reg0 = ipq_pwm_reg_read(pwm, IPQ_PWM_REG0);
+	reg1 = ipq_pwm_reg_read(pwm, IPQ_PWM_REG1);
+
+	state->polarity = PWM_POLARITY_NORMAL;
+	state->enabled = reg1 & IPQ_PWM_REG1_ENABLE;
+
+	pwm_div = FIELD_GET(IPQ_PWM_REG0_PWM_DIV, reg0);
+	hi_dur = FIELD_GET(IPQ_PWM_REG0_HI_DURATION, reg0);
+	pre_div = FIELD_GET(IPQ_PWM_REG1_PRE_DIV, reg1);
+
+	/* No overflow here, both pre_div and pwm_div <= 0xffff */
+	effective_div = (u64)(pre_div + 1) * (pwm_div + 1);
+	state->period = DIV64_U64_ROUND_UP(effective_div * NSEC_PER_SEC, rate);
+
+	hi_div = hi_dur * (pre_div + 1);
+	state->duty_cycle = DIV64_U64_ROUND_UP(hi_div * NSEC_PER_SEC, rate);
+
+	return 0;
+}
+
+static const struct pwm_ops ipq_pwm_ops = {
+	.apply = ipq_pwm_apply,
+	.get_state = ipq_pwm_get_state,
+	.owner = THIS_MODULE,
+};
+
+static int ipq_pwm_probe(struct platform_device *pdev)
+{
+	struct ipq_pwm_chip *pwm;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	pwm = devm_kzalloc(dev, sizeof(*pwm), GFP_KERNEL);
+	if (!pwm)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, pwm);
+
+	pwm->mem = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(pwm->mem))
+		return dev_err_probe(dev, PTR_ERR(pwm->mem),
+				"regs map failed");
+
+	pwm->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(pwm->clk))
+		return dev_err_probe(dev, PTR_ERR(pwm->clk),
+				"failed to get clock");
+
+	ret = clk_prepare_enable(pwm->clk);
+	if (ret)
+		return dev_err_probe(dev, ret, "clock enable failed");
+
+	pwm->chip.dev = dev;
+	pwm->chip.ops = &ipq_pwm_ops;
+	pwm->chip.npwm = 4;
+
+	ret = pwmchip_add(&pwm->chip);
+	if (ret < 0) {
+		dev_err_probe(dev, ret, "pwmchip_add() failed\n");
+		clk_disable_unprepare(pwm->clk);
+	}
+
+	return ret;
+}
+
+static int ipq_pwm_remove(struct platform_device *pdev)
+{
+	struct ipq_pwm_chip *pwm = platform_get_drvdata(pdev);
+
+	pwmchip_remove(&pwm->chip);
+	clk_disable_unprepare(pwm->clk);
+
+	return 0;
+}
+
+static const struct of_device_id pwm_ipq_dt_match[] = {
+	{ .compatible = "qcom,ipq6018-pwm", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, pwm_ipq_dt_match);
+
+static struct platform_driver ipq_pwm_driver = {
+	.driver = {
+		.name = "ipq-pwm",
+		.of_match_table = pwm_ipq_dt_match,
+	},
+	.probe = ipq_pwm_probe,
+	.remove = ipq_pwm_remove,
+};
+
+module_platform_driver(ipq_pwm_driver);
+
+MODULE_LICENSE("Dual BSD/GPL");
-- 
2.34.1

[PATCH V12 2/3] dt-bindings: pwm: add IPQ6018 binding

[Devi Priya]

DT binding for the PWM block in Qualcomm IPQ6018 SoC.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
---
v12:

  Picked up the R-b tag

v11:

  No change

v10:

  No change

v9:

  Add 'ranges' property to example (Rob)

  Drop label in example (Rob)

v8:

  Add size cell to 'reg' (Rob)

v7:

  Use 'reg' instead of 'offset' (Rob)

  Drop 'clock-names' and 'assigned-clock*' (Bjorn)

  Use single cell address/size in example node (Bjorn)

  Move '#pwm-cells' lower in example node (Bjorn)

  List 'reg' as required

v6:

  Device node is child of TCSR; remove phandle (Rob Herring)

  Add assigned-clocks/assigned-clock-rates (Uwe Kleine-König)

v5: Use qcom,pwm-regs for phandle instead of direct regs (Bjorn
    Andersson, Kathiravan T)

v4: Update the binding example node as well (Rob Herring's bot)

v3: s/qcom,pwm-ipq6018/qcom,ipq6018-pwm/ (Rob Herring)

v2: Make #pwm-cells const (Rob Herring)

 .../devicetree/bindings/pwm/ipq-pwm.yaml      | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/ipq-pwm.yaml

diff --git a/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
new file mode 100644
index 000000000000..857086ad539e
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pwm/ipq-pwm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm IPQ6018 PWM controller
+
+maintainers:
+  - Baruch Siach <baruch@tkos.co.il>
+
+properties:
+  "#pwm-cells":
+    const: 2
+
+  compatible:
+    const: qcom,ipq6018-pwm
+
+  reg:
+    description: Offset of PWM register in the TCSR block.
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - "#pwm-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/qcom,gcc-ipq6018.h>
+
+    syscon@1937000 {
+        compatible = "qcom,tcsr-ipq6018", "syscon", "simple-mfd";
+        reg = <0x01937000 0x21000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0 0x1937000 0x21000>;
+
+        pwm: pwm@a010 {
+            compatible = "qcom,ipq6018-pwm";
+            reg = <0xa010 0x20>;
+            clocks = <&gcc GCC_ADSS_PWM_CLK>;
+            assigned-clocks = <&gcc GCC_ADSS_PWM_CLK>;
+            assigned-clock-rates = <100000000>;
+            #pwm-cells = <2>;
+        };
+    };
-- 
2.34.1

Re: [PATCH V12 2/3] dt-bindings: pwm: add IPQ6018 binding

[Krzysztof Kozlowski]

On 25/09/2023 08:59, Devi Priya wrote:
> DT binding for the PWM block in Qualcomm IPQ6018 SoC.
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
> Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>

...

> diff --git a/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
> new file mode 100644
> index 000000000000..857086ad539e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml

Filename matching compatible, so qcom,ipq6018-pwm.yaml

> @@ -0,0 +1,53 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pwm/ipq-pwm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm IPQ6018 PWM controller
> +
> +maintainers:
> +  - Baruch Siach <baruch@tkos.co.il>
> +
> +properties:
> +  "#pwm-cells":
> +    const: 2
> +
> +  compatible:
> +    const: qcom,ipq6018-pwm

compatible is always the first property.

> +
> +  reg:
> +    description: Offset of PWM register in the TCSR block.
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - "#pwm-cells"

And this order must be the same as in properties.

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,gcc-ipq6018.h>
> +
> +    syscon@1937000 {
> +        compatible = "qcom,tcsr-ipq6018", "syscon", "simple-mfd";
> +        reg = <0x01937000 0x21000>;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges = <0 0x1937000 0x21000>;

Drop this node, not related. The parent binding could have full example,
on the other hand. Additionally, I have doubts that you really tested
the parent binding.

> +
> +        pwm: pwm@a010 {
> +            compatible = "qcom,ipq6018-pwm";

Best regards,
Krzysztof

Re: [PATCH V12 2/3] dt-bindings: pwm: add IPQ6018 binding

[Devi Priya]

On 9/25/2023 12:41 PM, Krzysztof Kozlowski wrote:
> On 25/09/2023 08:59, Devi Priya wrote:
>> DT binding for the PWM block in Qualcomm IPQ6018 SoC.
>>
>> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
>> Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
>> Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
>> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
> 
> ...
> 
>> diff --git a/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
>> new file mode 100644
>> index 000000000000..857086ad539e
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
> 
> Filename matching compatible, so qcom,ipq6018-pwm.yaml
okay
> 
>> @@ -0,0 +1,53 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/pwm/ipq-pwm.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm IPQ6018 PWM controller
>> +
>> +maintainers:
>> +  - Baruch Siach <baruch@tkos.co.il>
>> +
>> +properties:
>> +  "#pwm-cells":
>> +    const: 2
>> +
>> +  compatible:
>> +    const: qcom,ipq6018-pwm
> 
> compatible is always the first property.
okay
> 
>> +
>> +  reg:
>> +    description: Offset of PWM register in the TCSR block.
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - "#pwm-cells"
> 
> And this order must be the same as in properties.
okay
> 
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/qcom,gcc-ipq6018.h>
>> +
>> +    syscon@1937000 {
>> +        compatible = "qcom,tcsr-ipq6018", "syscon", "simple-mfd";
>> +        reg = <0x01937000 0x21000>;
>> +        #address-cells = <1>;
>> +        #size-cells = <1>;
>> +        ranges = <0 0x1937000 0x21000>;
> 
> Drop this node, not related. The parent binding could have full example,
> on the other hand. Additionally, I have doubts that you really tested
> the parent binding.
Sure, will drop the syscon node

Thanks,
Devi Priya
> 
>> +
>> +        pwm: pwm@a010 {
>> +            compatible = "qcom,ipq6018-pwm";
> 
> Best regards,
> Krzysztof
> 

Re: [PATCH V12 2/3] dt-bindings: pwm: add IPQ6018 binding

[Devi Priya]

On 9/29/2023 1:25 PM, Devi Priya wrote:
> 
> 
> On 9/25/2023 12:41 PM, Krzysztof Kozlowski wrote:
>> On 25/09/2023 08:59, Devi Priya wrote:
>>> DT binding for the PWM block in Qualcomm IPQ6018 SoC.
>>>
>>> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
>>> Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
>>> Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
>>> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
>>
>> ...
>>
>>> diff --git a/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml 
>>> b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
>>> new file mode 100644
>>> index 000000000000..857086ad539e
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
>>
>> Filename matching compatible, so qcom,ipq6018-pwm.yaml
> okay
We would have other ipq compatibles (ipq9574 & ipq5332) being added to
the binding in the upcoming series.
So, shall we rename the binding to qcom,ipq-pwm.yaml

Thanks,
Devi Priya
>>
>>> @@ -0,0 +1,53 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/pwm/ipq-pwm.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Qualcomm IPQ6018 PWM controller
>>> +
>>> +maintainers:
>>> +  - Baruch Siach <baruch@tkos.co.il>
>>> +
>>> +properties:
>>> +  "#pwm-cells":
>>> +    const: 2
>>> +
>>> +  compatible:
>>> +    const: qcom,ipq6018-pwm
>>
>> compatible is always the first property.
> okay
>>
>>> +
>>> +  reg:
>>> +    description: Offset of PWM register in the TCSR block.
>>> +    maxItems: 1
>>> +
>>> +  clocks:
>>> +    maxItems: 1
>>> +
>>> +required:
>>> +  - compatible
>>> +  - reg
>>> +  - clocks
>>> +  - "#pwm-cells"
>>
>> And this order must be the same as in properties.
> okay
>>
>>> +
>>> +additionalProperties: false
>>> +
>>> +examples:
>>> +  - |
>>> +    #include <dt-bindings/clock/qcom,gcc-ipq6018.h>
>>> +
>>> +    syscon@1937000 {
>>> +        compatible = "qcom,tcsr-ipq6018", "syscon", "simple-mfd";
>>> +        reg = <0x01937000 0x21000>;
>>> +        #address-cells = <1>;
>>> +        #size-cells = <1>;
>>> +        ranges = <0 0x1937000 0x21000>;
>>
>> Drop this node, not related. The parent binding could have full example,
>> on the other hand. Additionally, I have doubts that you really tested
>> the parent binding.
> Sure, will drop the syscon node
> 
> Thanks,
> Devi Priya
>>
>>> +
>>> +        pwm: pwm@a010 {
>>> +            compatible = "qcom,ipq6018-pwm";
>>
>> Best regards,
>> Krzysztof
>>

Re: [PATCH V12 2/3] dt-bindings: pwm: add IPQ6018 binding

[Krzysztof Kozlowski]

On 29/09/2023 10:56, Devi Priya wrote:

>>>> diff --git a/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml 
>>>> b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
>>>> new file mode 100644
>>>> index 000000000000..857086ad539e
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
>>>
>>> Filename matching compatible, so qcom,ipq6018-pwm.yaml
>> okay
> We would have other ipq compatibles (ipq9574 & ipq5332) being added to
> the binding in the upcoming series.
> So, shall we rename the binding to qcom,ipq-pwm.yaml

I prefer not.

Best regards,
Krzysztof

Re: [PATCH V12 2/3] dt-bindings: pwm: add IPQ6018 binding

[Devi Priya]

On 9/30/2023 9:02 PM, Krzysztof Kozlowski wrote:
> On 29/09/2023 10:56, Devi Priya wrote:
> 
>>>>> diff --git a/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
>>>>> b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..857086ad539e
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
>>>>
>>>> Filename matching compatible, so qcom,ipq6018-pwm.yaml
>>> okay
>> We would have other ipq compatibles (ipq9574 & ipq5332) being added to
>> the binding in the upcoming series.
>> So, shall we rename the binding to qcom,ipq-pwm.yaml
> 
> I prefer not.
> 
Sure, okay

Thanks,
Devi Priya
> Best regards,
> Krzysztof
> 

Re: [PATCH V12 2/3] dt-bindings: pwm: add IPQ6018 binding

[Rob Herring]

On Mon, 25 Sep 2023 12:29:14 +0530, Devi Priya wrote:
> DT binding for the PWM block in Qualcomm IPQ6018 SoC.
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
> Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
> ---
> v12:
> 
>   Picked up the R-b tag
> 
> v11:
> 
>   No change
> 
> v10:
> 
>   No change
> 
> v9:
> 
>   Add 'ranges' property to example (Rob)
> 
>   Drop label in example (Rob)
> 
> v8:
> 
>   Add size cell to 'reg' (Rob)
> 
> v7:
> 
>   Use 'reg' instead of 'offset' (Rob)
> 
>   Drop 'clock-names' and 'assigned-clock*' (Bjorn)
> 
>   Use single cell address/size in example node (Bjorn)
> 
>   Move '#pwm-cells' lower in example node (Bjorn)
> 
>   List 'reg' as required
> 
> v6:
> 
>   Device node is child of TCSR; remove phandle (Rob Herring)
> 
>   Add assigned-clocks/assigned-clock-rates (Uwe Kleine-König)
> 
> v5: Use qcom,pwm-regs for phandle instead of direct regs (Bjorn
>     Andersson, Kathiravan T)
> 
> v4: Update the binding example node as well (Rob Herring's bot)
> 
> v3: s/qcom,pwm-ipq6018/qcom,ipq6018-pwm/ (Rob Herring)
> 
> v2: Make #pwm-cells const (Rob Herring)
> 
>  .../devicetree/bindings/pwm/ipq-pwm.yaml      | 53 +++++++++++++++++++
>  1 file changed, 53 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/pwm/ipq-pwm.example.dtb: syscon@1937000: compatible: ['qcom,tcsr-ipq6018', 'syscon', 'simple-mfd'] is too long
	from schema $id: http://devicetree.org/schemas/mfd/qcom,tcsr.yaml#
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/pwm/ipq-pwm.example.dtb: syscon@1937000: '#address-cells', '#size-cells', 'pwm@a010', 'ranges' do not match any of the regexes: 'pinctrl-[0-9]+'
	from schema $id: http://devicetree.org/schemas/mfd/qcom,tcsr.yaml#

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230925065915.3467964-3-quic_devipriy@quicinc.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

[PATCH V12 3/3] arm64: dts: ipq6018: add pwm node

[Devi Priya]

Describe the PWM block on IPQ6018.

The PWM is in the TCSR area. Make &tcsr "simple-mfd" compatible, and add
&pwm as child of &tcsr.

Add also ipq6018 specific compatible string.

Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
---
v12: 

  No change

v11:

  No change

v10:

  No change

v9:

  Add 'ranges' property (Rob)

v8:

  Add size cell to 'reg' (Rob)

v7:

  Use 'reg' instead of 'offset' (Rob)

  Add qcom,tcsr-ipq6018 (Rob)

  Drop clock-names (Bjorn)

v6:

  Make the PWM node child of TCSR (Rob Herring)

  Add assigned-clocks/assigned-clock-rates (Uwe Kleine-König)

v5: Use qcom,pwm-regs for TCSR phandle instead of direct regs

v3: s/qcom,pwm-ipq6018/qcom,ipq6018-pwm/ (Rob Herring)

 arch/arm64/boot/dts/qcom/ipq6018.dtsi | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/ipq6018.dtsi b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
index 47b8b1d6730a..cadd2c583526 100644
--- a/arch/arm64/boot/dts/qcom/ipq6018.dtsi
+++ b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
@@ -398,8 +398,21 @@ tcsr_mutex: hwlock@1905000 {
 		};
 
 		tcsr: syscon@1937000 {
-			compatible = "qcom,tcsr-ipq6018", "syscon";
+			compatible = "qcom,tcsr-ipq6018", "syscon", "simple-mfd";
 			reg = <0x0 0x01937000 0x0 0x21000>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0x0 0x0 0x01937000 0x21000>;
+
+			 pwm: pwm@a010 {
+				compatible = "qcom,ipq6018-pwm";
+				reg = <0xa010 0x20>;
+				clocks = <&gcc GCC_ADSS_PWM_CLK>;
+				assigned-clocks = <&gcc GCC_ADSS_PWM_CLK>;
+				assigned-clock-rates = <100000000>;
+				#pwm-cells = <2>;
+				status = "disabled";
+			};
 		};
 
 		usb2: usb@70f8800 {
-- 
2.34.1

Re: [PATCH V12 3/3] arm64: dts: ipq6018: add pwm node

[Krzysztof Kozlowski]

On 25/09/2023 08:59, Devi Priya wrote:
> Describe the PWM block on IPQ6018.
> 
> The PWM is in the TCSR area. Make &tcsr "simple-mfd" compatible, and add
> &pwm as child of &tcsr.
> 
> Add also ipq6018 specific compatible string.
> 
> Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
> Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
> ---
> v12: 
> 
>   No change
> 
> v11:
> 
>   No change
> 
> v10:
> 
>   No change
> 
> v9:
> 
>   Add 'ranges' property (Rob)
> 
> v8:
> 
>   Add size cell to 'reg' (Rob)
> 
> v7:
> 
>   Use 'reg' instead of 'offset' (Rob)
> 
>   Add qcom,tcsr-ipq6018 (Rob)
> 
>   Drop clock-names (Bjorn)
> 
> v6:
> 
>   Make the PWM node child of TCSR (Rob Herring)
> 
>   Add assigned-clocks/assigned-clock-rates (Uwe Kleine-König)
> 
> v5: Use qcom,pwm-regs for TCSR phandle instead of direct regs
> 
> v3: s/qcom,pwm-ipq6018/qcom,ipq6018-pwm/ (Rob Herring)
> 
>  arch/arm64/boot/dts/qcom/ipq6018.dtsi | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq6018.dtsi b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> index 47b8b1d6730a..cadd2c583526 100644
> --- a/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> @@ -398,8 +398,21 @@ tcsr_mutex: hwlock@1905000 {
>  		};
>  
>  		tcsr: syscon@1937000 {
> -			compatible = "qcom,tcsr-ipq6018", "syscon";
> +			compatible = "qcom,tcsr-ipq6018", "syscon", "simple-mfd";

It does not look like you tested the DTS against bindings. Please run
`make dtbs_check W=1` (see
Documentation/devicetree/bindings/writing-schema.rst or
https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
for instructions).

Best regards,
Krzysztof

Re: [PATCH V12 3/3] arm64: dts: ipq6018: add pwm node

[Devi Priya]

On 9/25/2023 12:29 PM, Devi Priya wrote:
> Describe the PWM block on IPQ6018.
> 
> The PWM is in the TCSR area. Make &tcsr "simple-mfd" compatible, and add
> &pwm as child of &tcsr.
> 
> Add also ipq6018 specific compatible string.
> 
> Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
> Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
> ---
> v12:
> 
>    No change
> 
> v11:
> 
>    No change
> 
> v10:
> 
>    No change
> 
> v9:
> 
>    Add 'ranges' property (Rob)
> 
> v8:
> 
>    Add size cell to 'reg' (Rob)
> 
> v7:
> 
>    Use 'reg' instead of 'offset' (Rob)
> 
>    Add qcom,tcsr-ipq6018 (Rob)
> 
>    Drop clock-names (Bjorn)
> 
> v6:
> 
>    Make the PWM node child of TCSR (Rob Herring)
> 
>    Add assigned-clocks/assigned-clock-rates (Uwe Kleine-König)
> 
> v5: Use qcom,pwm-regs for TCSR phandle instead of direct regs
> 
> v3: s/qcom,pwm-ipq6018/qcom,ipq6018-pwm/ (Rob Herring)
> 
>   arch/arm64/boot/dts/qcom/ipq6018.dtsi | 15 ++++++++++++++-
>   1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq6018.dtsi b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> index 47b8b1d6730a..cadd2c583526 100644
> --- a/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> @@ -398,8 +398,21 @@ tcsr_mutex: hwlock@1905000 {
>   		};
>   
>   		tcsr: syscon@1937000 {
> -			compatible = "qcom,tcsr-ipq6018", "syscon";
> +			compatible = "qcom,tcsr-ipq6018", "syscon", "simple-mfd";
>   			reg = <0x0 0x01937000 0x0 0x21000>;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges = <0x0 0x0 0x01937000 0x21000>;
> +
Hi Krzysztof,
Referring to 
https://lore.kernel.org/all/20220909091056.128949-1-krzysztof.kozlowski@linaro.org/, 
it seems that the TCSR block should
not have any child nodes. Could you pls provide your suggestions on pwm
being added as the child node?

Thanks,
Devi Priya
> +			 pwm: pwm@a010 {
> +				compatible = "qcom,ipq6018-pwm";
> +				reg = <0xa010 0x20>;
> +				clocks = <&gcc GCC_ADSS_PWM_CLK>;
> +				assigned-clocks = <&gcc GCC_ADSS_PWM_CLK>;
> +				assigned-clock-rates = <100000000>;
> +				#pwm-cells = <2>;
> +				status = "disabled";
> +			};
>   		};
>   
>   		usb2: usb@70f8800 {

Re: [PATCH V12 3/3] arm64: dts: ipq6018: add pwm node

[Krzysztof Kozlowski]

On 29/09/2023 13:47, Devi Priya wrote:
> 
> 
> On 9/25/2023 12:29 PM, Devi Priya wrote:
>> Describe the PWM block on IPQ6018.
>>
>> The PWM is in the TCSR area. Make &tcsr "simple-mfd" compatible, and add
>> &pwm as child of &tcsr.
>>
>> Add also ipq6018 specific compatible string.
>>
>> Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
>> Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
>> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
>> ---
>> v12:
>>
>>    No change
>>
>> v11:
>>
>>    No change
>>
>> v10:
>>
>>    No change
>>
>> v9:
>>
>>    Add 'ranges' property (Rob)
>>
>> v8:
>>
>>    Add size cell to 'reg' (Rob)
>>
>> v7:
>>
>>    Use 'reg' instead of 'offset' (Rob)
>>
>>    Add qcom,tcsr-ipq6018 (Rob)
>>
>>    Drop clock-names (Bjorn)
>>
>> v6:
>>
>>    Make the PWM node child of TCSR (Rob Herring)
>>
>>    Add assigned-clocks/assigned-clock-rates (Uwe Kleine-König)
>>
>> v5: Use qcom,pwm-regs for TCSR phandle instead of direct regs
>>
>> v3: s/qcom,pwm-ipq6018/qcom,ipq6018-pwm/ (Rob Herring)
>>
>>   arch/arm64/boot/dts/qcom/ipq6018.dtsi | 15 ++++++++++++++-
>>   1 file changed, 14 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/ipq6018.dtsi b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
>> index 47b8b1d6730a..cadd2c583526 100644
>> --- a/arch/arm64/boot/dts/qcom/ipq6018.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
>> @@ -398,8 +398,21 @@ tcsr_mutex: hwlock@1905000 {
>>   		};
>>   
>>   		tcsr: syscon@1937000 {
>> -			compatible = "qcom,tcsr-ipq6018", "syscon";
>> +			compatible = "qcom,tcsr-ipq6018", "syscon", "simple-mfd";
>>   			reg = <0x0 0x01937000 0x0 0x21000>;
>> +			#address-cells = <1>;
>> +			#size-cells = <1>;
>> +			ranges = <0x0 0x0 0x01937000 0x21000>;
>> +
> Hi Krzysztof,
> Referring to 
> https://lore.kernel.org/all/20220909091056.128949-1-krzysztof.kozlowski@linaro.org/, 
> it seems that the TCSR block should
> not have any child nodes. Could you pls provide your suggestions on pwm
> being added as the child node?

If you are sure that TCSR contains PWM and all registers are there, then
feel free to add proper binding. Sending untested patch is not the way
to go.

Best regards,
Krzysztof

Re: [PATCH V12 3/3] arm64: dts: ipq6018: add pwm node

[Devi Priya]

On 9/30/2023 9:05 PM, Krzysztof Kozlowski wrote:
> On 29/09/2023 13:47, Devi Priya wrote:
>>
>>
>> On 9/25/2023 12:29 PM, Devi Priya wrote:
>>> Describe the PWM block on IPQ6018.
>>>
>>> The PWM is in the TCSR area. Make &tcsr "simple-mfd" compatible, and add
>>> &pwm as child of &tcsr.
>>>
>>> Add also ipq6018 specific compatible string.
>>>
>>> Co-developed-by: Baruch Siach <baruch.siach@siklu.com>
>>> Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
>>> Signed-off-by: Devi Priya <quic_devipriy@quicinc.com>
>>> ---
>>> v12:
>>>
>>>     No change
>>>
>>> v11:
>>>
>>>     No change
>>>
>>> v10:
>>>
>>>     No change
>>>
>>> v9:
>>>
>>>     Add 'ranges' property (Rob)
>>>
>>> v8:
>>>
>>>     Add size cell to 'reg' (Rob)
>>>
>>> v7:
>>>
>>>     Use 'reg' instead of 'offset' (Rob)
>>>
>>>     Add qcom,tcsr-ipq6018 (Rob)
>>>
>>>     Drop clock-names (Bjorn)
>>>
>>> v6:
>>>
>>>     Make the PWM node child of TCSR (Rob Herring)
>>>
>>>     Add assigned-clocks/assigned-clock-rates (Uwe Kleine-König)
>>>
>>> v5: Use qcom,pwm-regs for TCSR phandle instead of direct regs
>>>
>>> v3: s/qcom,pwm-ipq6018/qcom,ipq6018-pwm/ (Rob Herring)
>>>
>>>    arch/arm64/boot/dts/qcom/ipq6018.dtsi | 15 ++++++++++++++-
>>>    1 file changed, 14 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/ipq6018.dtsi b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
>>> index 47b8b1d6730a..cadd2c583526 100644
>>> --- a/arch/arm64/boot/dts/qcom/ipq6018.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
>>> @@ -398,8 +398,21 @@ tcsr_mutex: hwlock@1905000 {
>>>    		};
>>>    
>>>    		tcsr: syscon@1937000 {
>>> -			compatible = "qcom,tcsr-ipq6018", "syscon";
>>> +			compatible = "qcom,tcsr-ipq6018", "syscon", "simple-mfd";
>>>    			reg = <0x0 0x01937000 0x0 0x21000>;
>>> +			#address-cells = <1>;
>>> +			#size-cells = <1>;
>>> +			ranges = <0x0 0x0 0x01937000 0x21000>;
>>> +
>> Hi Krzysztof,
>> Referring to
>> https://lore.kernel.org/all/20220909091056.128949-1-krzysztof.kozlowski@linaro.org/,
>> it seems that the TCSR block should
>> not have any child nodes. Could you pls provide your suggestions on pwm
>> being added as the child node?
> 
> If you are sure that TCSR contains PWM and all registers are there, then
> feel free to add proper binding. Sending untested patch is not the way
> to go.

Sure, okay

Thanks,
Devi Priya
> 
> Best regards,
> Krzysztof
>