Re: [PATCH 2/7] pwm: jz4740: Use clocks from TCU driver

From: Uwe Kleine-König
Date: Fri Aug 09 2019 - 12:55:15 EST


On Fri, Aug 09, 2019 at 02:30:26PM +0200, Paul Cercueil wrote:
> The ingenic-timer "TCU" driver provides us with clocks, that can be
> (un)gated, reparented or reclocked from devicetree, instead of having
> these settings hardcoded in this driver.
>
> While this driver is devicetree-compatible, it is never (as of now)
> probed from devicetree, so this change does not introduce a ABI problem
> with current devicetree files.
>
> Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
> Tested-by: Mathieu Malaterre <malat@xxxxxxxxxx>
> Tested-by: Artur Rojek <contact@xxxxxxxxxxxxxx>
> ---
> drivers/pwm/Kconfig | 1 +
> drivers/pwm/pwm-jz4740.c | 40 ++++++++++++++++++++++++++--------------
> 2 files changed, 27 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> index cc4df0ec978a..d2557c6fcf65 100644
> --- a/drivers/pwm/Kconfig
> +++ b/drivers/pwm/Kconfig
> @@ -225,6 +225,7 @@ config PWM_IMX_TPM
> config PWM_JZ4740
> tristate "Ingenic JZ47xx PWM support"
> depends on MACH_INGENIC
> + depends on COMMON_CLK
> select MFD_SYSCON
> help
> Generic PWM framework driver for Ingenic JZ47xx based
> diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
> index 7aea5e0c6e18..6ec8794d3b99 100644
> --- a/drivers/pwm/pwm-jz4740.c
> +++ b/drivers/pwm/pwm-jz4740.c
> @@ -20,7 +20,6 @@
>
> struct jz4740_pwm_chip {
> struct pwm_chip chip;
> - struct clk *clk;
> struct regmap *map;
> };
>
> @@ -32,6 +31,9 @@ static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip)
> static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
> {
> struct jz4740_pwm_chip *jz = to_jz4740(chip);
> + struct clk *clk;
> + char clk_name[16];
> + int ret;
>
> /*
> * Timers 0 and 1 are used for system tasks, so they are unavailable
> @@ -40,16 +42,29 @@ static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
> if (pwm->hwpwm < 2)
> return -EBUSY;
>
> - regmap_write(jz->map, TCU_REG_TSCR, BIT(pwm->hwpwm));
> + snprintf(clk_name, sizeof(clk_name), "timer%u", pwm->hwpwm);

This undoes stuff from the previous patch. Maybe swap the order of the
two patches?

Other than that the patch looks fine on a quick glance.

Best regards
Uwe

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