linux-kernel - Re: [PATCH v2 18/28] pinctrl: renesas: rzg2l: add support for different ds values on different groups

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Date:   Wed, 4 Oct 2023 15:17:02 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Claudiu <claudiu.beznea@...on.dev>
Cc:     geert+renesas@...der.be, mturquette@...libre.com, sboyd@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, linus.walleij@...aro.org,
        gregkh@...uxfoundation.org, jirislaby@...nel.org,
        magnus.damm@...il.com, catalin.marinas@....com, will@...nel.org,
        quic_bjorande@...cinc.com, konrad.dybcio@...aro.org, arnd@...db.de,
        neil.armstrong@...aro.org, prabhakar.mahadev-lad.rj@...renesas.com,
        biju.das.jz@...renesas.com, linux-renesas-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 18/28] pinctrl: renesas: rzg2l: add support for
 different ds values on different groups

On Fri, Sep 29, 2023 at 7:39 AM Claudiu <claudiu.beznea@...on.dev> wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> RZ/G3S supports different drive strength values for different power sources
> and pin groups (A, B, C). On each group there could be up to 4 drive
> strength values per power source. Available power sources are 1v8, 2v5,
> 3v3. Drive strength values are fine tuned than what was previously
> available on the driver thus the necessity of having micro-amp support.
> As drive strength and power source values are linked together the
> hardware setup for these was moved at the end of
> rzg2l_pinctrl_pinconf_set() to ensure proper validation of the new
> values.
>
> The drive strength values are expected to be initialized though SoC
> specific hardware configuration data structure.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
>
> Changes in v2:
> - s/strenght/strength, s/togheter/together in commit description
> - got rid of RZG2L_INVALID_IOLH_VAL macro and consider zero as invalid
>   value for entries in struct rzg2l_hwcfg::iolh_group[abc]_ua[] arrays
> - removed spinlock in rzg2l_[sg]et_power_source()
> - introduced caps_to_pwr_reg() and simplified the code in
>   rzg2l_[sg]et_power_source()
> - changed return type of rzg2l_iolh_ua_to_val() to int and return
>   -EINVAL on failure cases
> - s/rzg2l_ds_supported/rzg2l_ds_is_supported
> - inverted the logic in rzg2l_pinctrl_pinconf_set() when applying drive
>   strength and power source to hardware registers and thus simplified the
>   code
> - used devm_kcalloc() instead of devm_kzalloc()
> - adderessed the rest of the review comments

Thanks, will queue in renesas-pinctrl-for-v6.7, with Paul's comment
addresses.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds