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Date: Wed, 23 Oct 2019 11:01:28 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: Qianggui Song <qianggui.song@...ogic.com>,
Linus Walleij <linus.walleij@...aro.org>,
linux-gpio@...r.kernel.org
Cc: Neil Armstrong <narmstrong@...libre.com>,
Kevin Hilman <khilman@...libre.com>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
Carlo Caione <carlo@...one.org>,
"Rob Herring" <robh+dt@...nel.org>,
Xingyu Chen <xingyu.chen@...ogic.com>,
"Jianxin Pan" <jianxin.pan@...ogic.com>,
Hanjie Lin <hanjie.lin@...ogic.com>,
"Mark Rutland" <mark.rutland@....com>,
linux-arm-kernel@...ts.infradead.org,
linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] pinctrl: meson: add a new dt parse callback for Meson-A series SoCs
On Mon 14 Oct 2019 at 12:54, Qianggui Song <qianggui.song@...ogic.com> wrote:
> Meson A1 Soc share the same register layout of pinmux with previous
> Meson-G12A, however there is difference for gpio and pin config register
> in A1. The main difference is that registers before A1 are grouped by
> function while those of A1 are by bank. The new register layout is as
> below:
>
> /* first bank */ /* addr */
> - P_PADCTRL_GPIOP_I base + 0x00 << 2
> - P_PADCTRL_GPIOP_O base + 0x01 << 2
> - P_PADCTRL_GPIOP_OEN base + 0x02 << 2
> - P_PADCTRL_GPIOP_PULL_EN base + 0x03 << 2
> - P_PADCTRL_GPIOP_PULL_UP base + 0x04 << 2
> - P_PADCTRL_GPIOP_DS base + 0x05 << 2
>
> /* second bank */
> - P_PADCTRL_GPIOB_I base + 0x10 << 2
> - P_PADCTRL_GPIOB_O base + 0x11 << 2
> - P_PADCTRL_GPIOB_OEN base + 0x12 << 2
> - P_PADCTRL_GPIOB_PULL_EN base + 0x13 << 2
> - P_PADCTRL_GPIOB_PULL_UP base + 0x14 << 2
> - P_PADCTRL_GPIOB_DS base + 0x15 << 2
>
> Each bank contains at least 6 registers to be configured, if one bank
> has more than 16 gpios, an extra P_PADCTRL_GPIO[X]_DS_EXT is included.
> Between two adjacent P_PADCTRL_GPIO[X]_I, there is an offset 0x10, that
> is to say, for third bank, the offsets will be 0x20,0x21,0x22,0x23,0x24
> ,0x25 according to above register layout. For previous chips, registers
> are grouped according to their functions while registers of A1 are
> according to bank.
>
> Current Meson pinctrl driver can cover such change by using base address
> of GPIO as that of drive-strength.While simply giving reg_ds = reg_pullen
> make wrong value to reg_ds for Socs that do not support drive-strength
> like AXG.To make things simple, add an extra dt parser function for
> a1 or later chip and remain the old dt parser function for old Socs.
>
> Signed-off-by: Qianggui Song <qianggui.song@...ogic.com>
> ---
> drivers/pinctrl/meson/pinctrl-meson.c | 16 +++++++++++++++-
> drivers/pinctrl/meson/pinctrl-meson.h | 7 +++++++
> 2 files changed, 22 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
> index 8bba9d053d9f..e8f6298fc96a 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson.c
> +++ b/drivers/pinctrl/meson/pinctrl-meson.c
> @@ -695,6 +695,17 @@ static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc,
> return 0;
> }
>
> +int meson_pinctrl_parse_dt_extra(struct meson_pinctrl *pc,
> + struct device_node *node)
This function is the fixup for the a1 family, AFAICT.
It should be named as such and it belong in pinctrl-meson-a1.c
Every controller performing fixups should have their function as well:
(1) AO of gxbb, gxl and axg
(2) AO of g12 and sm
> +{
> + int ret;
> +
> + ret = meson_pinctrl_parse_dt(pc, node);
As said in previous review, meson_pinctrl_parse_dt() should be called
for every SoC to parse the *available* regions.
The fixup, if necessary, will be done by providing a callback
IOW, please:
* rework meson_pinctrl_parse_dt() to only parse the avaialble region
* don't call meson_pinctrl_parse_dt() from the extra function
* provided the extra function for the AO controllers of the other SoCs
> + pc->reg_ds = pc->reg_pullen;
> +
> + return ret;
> +}
> +
> int meson_pinctrl_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -708,7 +719,10 @@ int meson_pinctrl_probe(struct platform_device *pdev)
> pc->dev = dev;
> pc->data = (struct meson_pinctrl_data *) of_device_get_match_data(dev);
>
> - ret = meson_pinctrl_parse_dt(pc, dev->of_node);
> + if (pc->data->parse_dt)
> + ret = pc->data->parse_dt(pc, dev->of_node);
> + else
> + ret = meson_pinctrl_parse_dt(pc, dev->of_node);
> if (ret)
> return ret;
>
> diff --git a/drivers/pinctrl/meson/pinctrl-meson.h b/drivers/pinctrl/meson/pinctrl-meson.h
> index c696f3241a36..0cd6a869cae3 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson.h
> +++ b/drivers/pinctrl/meson/pinctrl-meson.h
> @@ -11,6 +11,8 @@
> #include <linux/regmap.h>
> #include <linux/types.h>
>
> +struct meson_pinctrl;
> +
> /**
> * struct meson_pmx_group - a pinmux group
> *
> @@ -114,6 +116,7 @@ struct meson_pinctrl_data {
> unsigned int num_banks;
> const struct pinmux_ops *pmx_ops;
> void *pmx_data;
> + int (*parse_dt)(struct meson_pinctrl *pc, struct device_node *node);
> };
>
> struct meson_pinctrl {
> @@ -171,3 +174,7 @@ int meson_pmx_get_groups(struct pinctrl_dev *pcdev,
>
> /* Common probe function */
> int meson_pinctrl_probe(struct platform_device *pdev);
> +
> +/* Extra dt parse function for register layout grouped by bank */
> +int meson_pinctrl_parse_dt_extra(struct meson_pinctrl *pc,
> + struct device_node *node);
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