linux-kernel - Re: [PATCH v6 2/3] pinctrl: meson: add pinctrl driver support for Meson-A1 SoC

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Date:   Tue, 19 Nov 2019 15:56:14 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Qianggui Song <qianggui.song@...ogic.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...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 <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 2/3] pinctrl: meson: add pinctrl driver support for
 Meson-A1 SoC

On Fri, Nov 15, 2019 at 1:03 PM 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.Also note that there is no AO bank any more in A1.
>
> 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 and remain the old dt parser function for only reg parsing.
>
> Signed-off-by: Qianggui Song <qianggui.song@...ogic.com>

Patch applied with Neil's Review tag.

Yours,
Linus Walleij