pwm: bcm2835: Support for polarity setting via DT

This patch series adds support for the third (optional) pwm cell to specify the polarity.

Changes in V2:
* add ack and review tags

Stefan Wahren (2):
dt-bindings: pwm-bcm2835: Increase pwm-cells
pwm: bcm2835: Support for polarity setting via DT

 Documentation/devicetree/bindings/pwm/pwm-bcm2835.txt | 4 ++--
 drivers/pwm/pwm-bcm2835.c                             | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

2.7.4

We need to increase the pwm-cells for the optional flags parameter, before we can implement support for polarity setting via DT.

---
 Documentation/devicetree/bindings/pwm/pwm-bcm2835.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index cf573e8..8cf87d1 100644
@@ -6,7 +6,7 @@ Required properties:
 - clocks: This clock defines the base clock frequency of the PWM hardware
   system, the period and the duty_cycle of the PWM signal is a multiple of
   the base period.
-- #pwm-cells: Should be 2. See pwm.txt in this directory for a description of
+- #pwm-cells: Should be 3. See pwm.txt in this directory for a description of
   the cells format.
 
 Examples:

@@ -15,7 +15,7 @@ pwm at 2020c000 {
 	compatible = "brcm,bcm2835-pwm";
 	reg = <0x2020c000 0x28>;
 	clocks = <&clk_pwm>;
-	#pwm-cells = <2>;
+	#pwm-cells = <3>;
 };
 
 clocks {

2.7.4

This adds support for the third (optional) pwm cell to specify the polarity, which is needed by display backlights for example.

---
 drivers/pwm/pwm-bcm2835.c | 2 ++
 1 file changed, 2 insertions(+)

index c5dbf16..db001cb 100644
@@ -167,6 +167,8 @@ static int bcm2835_pwm_probe(struct platform_device *pdev)
 	pc->chip.dev = &pdev->dev;
 	pc->chip.ops = &bcm2835_pwm_ops;
 	pc->chip.npwm = 2;
+	pc->chip.of_xlate = of_pwm_xlate_with_flags;
+	pc->chip.of_pwm_n_cells = 3;
 
 	platform_set_drvdata(pdev, pc);
 

2.7.4

Both patches applied to for-4.14/drivers, thanks.

Thierry
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