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path: root/drivers/pwm/pwm-bcm2835.c
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2020-09-24pwm: bcm2835: Simplify with dev_err_probe()Krzysztof Kozlowski1-7/+3
Common pattern of handling deferred probe can be simplified with dev_err_probe(). Less code and also it prints the error value. Signed-off-by: Krzysztof Kozlowski <[email protected]> Acked-by: Florian Fainelli <[email protected]> Acked-by: Uwe Kleine-König <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2020-03-30pwm: bcm2835: Dynamically allocate baseFlorian Fainelli1-0/+1
The newer 2711 and 7211 chips have two PWM controllers and failure to dynamically allocate the PWM base would prevent the second PWM controller instance being probed for succeeding with an -EEXIST error from alloc_pwms(). Fixes: e5a06dc5ac1f ("pwm: Add BCM2835 PWM driver") Signed-off-by: Florian Fainelli <[email protected]> Acked-by: Uwe Kleine-König <[email protected]> Reviewed-by: Nicolas Saenz Julienne <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2019-09-21pwm: bcm2835: Suppress error message during deferred probeStefan Wahren1-2/+5
This suppresses error messages in case the PWM clock isn't ready yet. Signed-off-by: Stefan Wahren <[email protected]> Reviewed-by: Uwe Kleine-König <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2019-09-21pwm: bcm2835: Fix period_ns range checkStefan Wahren1-4/+5
The range check for period_ns was written under assumption of a fixed PWM clock. With clk-bcm2835 driver the PWM clock is a dynamic one. So fix this by doing the range check on the period register value. Signed-off-by: Stefan Wahren <[email protected]> Acked-by: Uwe Kleine-König <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2019-09-21pwm: bcm2835: Suppress error message for invalid period_nsStefan Wahren1-4/+1
The PWM config can be triggered via sysfs, so we better suppress the error message in case of an invalid period to avoid kernel log spamming. Signed-off-by: Stefan Wahren <[email protected]> Acked-by: Uwe Kleine-König <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2019-06-26pwm: bcm2835: Improve precision of PWMSean Young1-3/+5
If sending IR with carrier of 455kHz using the pwm-ir-tx driver, the carrier ends up being 476kHz. The clock is set to bcm2835-pwm with a rate of 10MHz. A carrier of 455kHz has a period of 2198ns, but the arithmetic truncates this to 2100ns rather than 2200ns. So, use DIV_ROUND_CLOSEST() to reduce rounding errors, and we have a much more accurate carrier of 454.5kHz. Reported-by: Andreas Christ <[email protected]> Signed-off-by: Sean Young <[email protected]> Acked-by: Stefan Wahren <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2018-12-24pwm: bcm2835: Switch to SPDX identifierStefan Wahren1-4/+1
Adopt the SPDX license identifier headers to ease license compliance management. Cc: Bart Tanghe <[email protected]> Signed-off-by: Stefan Wahren <[email protected]> Reviewed-by: Eric Anholt <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2017-08-21pwm: bcm2835: Support for polarity setting via DTStefan Wahren1-0/+2
This adds support for the third (optional) pwm cell to specify the polarity, which is needed by display backlights for example. Signed-off-by: Stefan Wahren <[email protected]> Reviewed-by: Eric Anholt <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2015-12-16pwm: bcm2835: Fix email address specificationStefan Wahren1-1/+1
Signed-off-by: Stefan Wahren <[email protected]> Reviewed-by: Eric Anholt <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2015-12-16pwm: bcm2835: Prevent division by zeroStefan Wahren1-1/+9
It's possible that the PWM clock becomes an orphan. So better check the result of clk_get_rate() in order to prevent a division by zero. Signed-off-by: Stefan Wahren <[email protected]> Reviewed-by: Eric Anholt <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2015-12-16pwm: bcm2835: Calculate scaler in ->config()Stefan Wahren1-5/+3
Currently pwm-bcm2835 assumes a fixed clock rate and stores the resulting scaler in the driver structure. But with the upcoming PWM clock support for clk-bcm2835 the rate could change, so calculate the scaler in the ->config() callback. Signed-off-by: Stefan Wahren <[email protected]> Reviewed-by: Eric Anholt <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
2014-11-17pwm: Add BCM2835 PWM driverBart Tanghe1-0/+205
Add PWM driver for Broadcom BCM2835 processor (Raspberry Pi) Signed-off-by: Bart Tanghe <[email protected]> Acked-by: Stephen Warren <[email protected]> Signed-off-by: Thierry Reding <[email protected]>
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