linux-kernel - Re: [PATCH 3/3] media: platform: meson-ao-cec-g12a: add wakeup support

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Date:   Thu, 12 Dec 2019 20:57:56 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Guillaume La Roque <glaroque@...libre.com>
Cc:     Neil Armstrong <narmstrong@...libre.com>, mchehab@...nel.org,
        hverkuil-cisco@...all.nl, khilman@...libre.com,
        devicetree@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-media <linux-media@...r.kernel.org>
Subject: Re: [PATCH 3/3] media: platform: meson-ao-cec-g12a: add wakeup support

Hi Guillaume,

(I don't know the specifics of this hardware but I have two general
comments below)

On Thu, Dec 12, 2019 at 4:00 PM Guillaume La Roque
<glaroque@...libre.com> wrote:
> +#define CECB_FUNC_CFG_REG              0xA0
> +#define CECB_FUNC_CFG_MASK             GENMASK(6, 0)
> +#define CECB_FUNC_CFG_CEC_ON           0x01
> +#define CECB_FUNC_CFG_OTP_ON           0x02
> +#define CECB_FUNC_CFG_AUTO_STANDBY     0x04
> +#define CECB_FUNC_CFG_AUTO_POWER_ON    0x08
> +#define CECB_FUNC_CFG_ALL              0x2f
> +#define CECB_FUNC_CFG_NONE             0x0
> +
> +#define CECB_LOG_ADDR_REG      0xA4
> +#define CECB_LOG_ADDR_MASK     GENMASK(22, 16)
do these registers have some RTI_* prefix in the datasheet?
that would make it easier to spot that these registers belong to AO /
RTI (while all other registers belong to the CEC controller)

[...]
> +       if (ao_cec->regmap_ao_sysctrl)
> +               ret |= regmap_update_bits(ao_cec->regmap_ao_sysctrl,
> +                                        CECB_LOG_ADDR_REG,
> +                                         CECB_FUNC_CFG_MASK,
why do we need to mask CECB_FUNC_CFG_MASK (from register 0xa0) in the
CECB_LOG_ADDR_REG register (0xa4)?

> +                                         logical_addr << CECB_LOG_ADDR_SHIFT);
FIELD_PREP(CECB_FUNC_CFG_MASK, logical_addr) would make it consistent
with the rest of the driver
then you can also drop the #define CECB_LOG_ADDR_SHIFT


Martin