[PATCH v2 0/2] Commonize pinctrl for camera master clock on Qualcomm SDM845

[PATCH v2 0/2] Commonize pinctrl for camera master clock on Qualcomm SDM845

[David Heidelberg via B4 Relay]

Inspired by Richard's patch set for SDM670, I noticed that SDM845
follows the same pattern. This change prepares for enabling
additional cameras.

These pinctrl settings have been verified against the downstream
SDM845 kernel.

Since most of these are not yet used in mainline, testing was done
on sdm845-next using OnePlus 6 cameras with downstream drivers.

Thank you
David

Signed-off-by: David Heidelberg <david@ixit.cz>
---
Changes in v2:
- Added mclk3. (Vladimir)
- Reword commit messages.
- Corrected commit msg name. (Konrad)
- Link to v1: https://lore.kernel.org/r/20251213-sdm845-mclk-v1-0-197bc947d4c6@ixit.cz

---
David Heidelberg (2):
      arm64: dts: qcom: sdm845: Introduce camera master clock pinctrl
      arm64: dts: qcom: sdm845-db845c: Use pad fn instead of defining own

 .../qcom/sdm845-db845c-navigation-mezzanine.dtso   |  2 +-
 arch/arm64/boot/dts/qcom/sdm845-db845c.dts         | 16 -------
 arch/arm64/boot/dts/qcom/sdm845.dtsi               | 56 ++++++++++++++++++++++
 3 files changed, 57 insertions(+), 17 deletions(-)
---
base-commit: 12b95d29eb979e5c4f4f31bb05817bc935c52050
change-id: 20251213-sdm845-mclk-041f2a952e31

Best regards,
-- 
David Heidelberg <david@ixit.cz>

[PATCH v2 1/2] arm64: dts: qcom: sdm845: Introduce camera master clock pinctrl

[David Heidelberg via B4 Relay]

From: David Heidelberg <david@ixit.cz>

Put clock pins configuration for camera master clock into the dtsi.

Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Signed-off-by: David Heidelberg <david@ixit.cz>
---
 arch/arm64/boot/dts/qcom/sdm845.dtsi | 56 ++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index bf2f9c04adba7..c0f21a745fb0c 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -2805,6 +2805,62 @@ tlmm: pinctrl@3400000 {
 			gpio-ranges = <&tlmm 0 0 151>;
 			wakeup-parent = <&pdc_intc>;
 
+			cam_mclk0_default: cam-mclk0-default-state {
+				pins = "gpio13";
+				function = "cam_mclk";
+				drive-strength = <2>;
+				bias-disable;
+			};
+
+			cam_mclk0_sleep: cam-mclk0-sleep-state {
+				pins = "gpio13";
+				function = "cam_mclk";
+				drive-strength = <2>;
+				bias-pull-down;
+			};
+
+			cam_mclk1_default: cam-mclk1-default-state {
+				pins = "gpio14";
+				function = "cam_mclk";
+				drive-strength = <2>;
+				bias-disable;
+			};
+
+			cam_mclk1_sleep: cam-mclk1-sleep-state {
+				pins = "gpio14";
+				function = "cam_mclk";
+				drive-strength = <2>;
+				bias-pull-down;
+			};
+
+			cam_mclk2_default: cam-mclk2-default-state {
+				pins = "gpio15";
+				function = "cam_mclk";
+				drive-strength = <2>;
+				bias-disable;
+			};
+
+			cam_mclk2_sleep: cam-mclk2-sleep-state {
+				pins = "gpio15";
+				function = "cam_mclk";
+				drive-strength = <2>;
+				bias-pull-down;
+			};
+
+			cam_mclk3_default: cam-mclk3-default-state {
+				pins = "gpio16";
+				function = "cam_mclk";
+				drive-strength = <2>;
+				bias-disable;
+			};
+
+			cam_mclk3_sleep: cam-mclk3-sleep-state {
+				pins = "gpio16";
+				function = "cam_mclk";
+				drive-strength = <2>;
+				bias-pull-down;
+			};
+
 			cci0_default: cci0-default-state {
 				/* SDA, SCL */
 				pins = "gpio17", "gpio18";

-- 
2.51.0

Re: [PATCH v2 1/2] arm64: dts: qcom: sdm845: Introduce camera master clock pinctrl

[Konrad Dybcio]

On 12/17/25 12:39 PM, David Heidelberg via B4 Relay wrote:
> From: David Heidelberg <david@ixit.cz>
> 
> Put clock pins configuration for camera master clock into the dtsi.
> 
> Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
> Signed-off-by: David Heidelberg <david@ixit.cz>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad

[PATCH v2 2/2] arm64: dts: qcom: sdm845-db845c: Use pad fn instead of defining own

[David Heidelberg via B4 Relay]

From: David Heidelberg <david@ixit.cz>

Instead of defining own pad function for master clock, pick one offered
by sdm845 device-tree include.

Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Signed-off-by: David Heidelberg <david@ixit.cz>
---
 .../dts/qcom/sdm845-db845c-navigation-mezzanine.dtso     |  2 +-
 arch/arm64/boot/dts/qcom/sdm845-db845c.dts               | 16 ----------------
 2 files changed, 1 insertion(+), 17 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso b/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso
index dbe1911d8e470..f6c2c98970d76 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso
+++ b/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso
@@ -40,7 +40,7 @@ camera@10 {
 		/* CAM0_RST_N */
 		reset-gpios = <&tlmm 9 GPIO_ACTIVE_LOW>;
 		pinctrl-names = "default";
-		pinctrl-0 = <&cam0_default>;
+		pinctrl-0 = <&cam0_default &cam_mclk0_default>;
 
 		clocks = <&clock_camcc CAM_CC_MCLK0_CLK>;
 		clock-names = "xvclk";
diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
index ce23f87e0316b..518d2ec657b13 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
@@ -877,14 +877,6 @@ rst-pins {
 			drive-strength = <16>;
 			bias-disable;
 		};
-
-		mclk0-pins {
-			pins = "gpio13";
-			function = "cam_mclk";
-
-			drive-strength = <16>;
-			bias-disable;
-		};
 	};
 
 	cam3_default: cam3-default-state {
@@ -895,14 +887,6 @@ rst-pins {
 			drive-strength = <16>;
 			bias-disable;
 		};
-
-		mclk3-pins {
-			function = "cam_mclk";
-			pins = "gpio16";
-
-			drive-strength = <16>;
-			bias-disable;
-		};
 	};
 
 	dsi_sw_sel: dsi-sw-sel-state {

-- 
2.51.0

Re: [PATCH v2 2/2] arm64: dts: qcom: sdm845-db845c: Use pad fn instead of defining own

[Konrad Dybcio]

On 12/17/25 12:39 PM, David Heidelberg via B4 Relay wrote:
> From: David Heidelberg <david@ixit.cz>
> 
> Instead of defining own pad function for master clock, pick one offered
> by sdm845 device-tree include.

I'm a little bitter about the wording - the pad function here is "cam_mclk",
whereas what you're doing is inheriting a common pinmux/pincfg node that
refers to that function

[...]

> -		mclk0-pins {
> -			pins = "gpio13";
> -			function = "cam_mclk";
> -
> -			drive-strength = <16>;

This patch changes the drive-strength (16 -> 2 mA)

FWIW it's 2 on reference designs and Sony boards, check your
downstream kernel

Konrad

Re: [PATCH v2 2/2] arm64: dts: qcom: sdm845-db845c: Use pad fn instead of defining own

[David Heidelberg]

On 18/12/2025 13:25, Konrad Dybcio wrote:
> On 12/17/25 12:39 PM, David Heidelberg via B4 Relay wrote:
>> From: David Heidelberg <david@ixit.cz>
>>
>> Instead of defining own pad function for master clock, pick one offered
>> by sdm845 device-tree include.
> 
> I'm a little bitter about the wording - the pad function here is "cam_mclk",
> whereas what you're doing is inheriting a common pinmux/pincfg node that
> refers to that function
> 
> [...]
> 
>> -		mclk0-pins {
>> -			pins = "gpio13";
>> -			function = "cam_mclk";
>> -
>> -			drive-strength = <16>;
> 
> This patch changes the drive-strength (16 -> 2 mA)
> 
> FWIW it's 2 on reference designs and Sony boards, check your
> downstream kernel

I don't have any. I'm fine with this patch not getting applied, but I'll 
CC Robert who added the support, maybe he can verify.

David

> 
> Konrad

-- 
David Heidelberg

Re: [PATCH v2 2/2] arm64: dts: qcom: sdm845-db845c: Use pad fn instead of defining own

[Konrad Dybcio]

On 12/22/25 3:01 PM, David Heidelberg wrote:
> On 18/12/2025 13:25, Konrad Dybcio wrote:
>> On 12/17/25 12:39 PM, David Heidelberg via B4 Relay wrote:
>>> From: David Heidelberg <david@ixit.cz>
>>>
>>> Instead of defining own pad function for master clock, pick one offered
>>> by sdm845 device-tree include.
>>
>> I'm a little bitter about the wording - the pad function here is "cam_mclk",
>> whereas what you're doing is inheriting a common pinmux/pincfg node that
>> refers to that function
>>
>> [...]
>>
>>> -        mclk0-pins {
>>> -            pins = "gpio13";
>>> -            function = "cam_mclk";
>>> -
>>> -            drive-strength = <16>;
>>
>> This patch changes the drive-strength (16 -> 2 mA)
>>
>> FWIW it's 2 on reference designs and Sony boards, check your
>> downstream kernel
> 
> I don't have any. I'm fine with this patch not getting applied, but I'll CC Robert who added the support, maybe he can verify.

FWIW this can be verified at runtime as well (running downstream) with

cat /sys/kernel/debug/gpio

Konrad