From: Maxime Ripard <maxime@cerno.tech>
To: "André Przywara" <andre.przywara@arm.com>
Cc: devicetree@vger.kernel.org,
Jernej Skrabec <jernej.skrabec@siol.net>,
Samuel Holland <samuel@sholland.org>,
Stephen Boyd <sboyd@kernel.org>,
Michael Turquette <mturquette@baylibre.com>,
linux-sunxi@googlegroups.com, linux-kernel@vger.kernel.org,
linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org,
Chen-Yu Tsai <wens@csie.org>, Rob Herring <robh+dt@kernel.org>,
Philipp Zabel <p.zabel@pengutronix.de>,
Linus Walleij <linus.walleij@linaro.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 4/4] arm64: dts: allwinner: h6: Use RSB for AXP805 PMIC connection
Date: Wed, 6 Jan 2021 12:06:43 +0100 [thread overview]
Message-ID: <20210106110643.agq3mjyhgvg3w4i6@gilmour> (raw)
In-Reply-To: <a6c2eac4-7e98-ecb4-ee8a-d67a7f1b6871@arm.com>
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On Mon, Jan 04, 2021 at 10:54:19AM +0000, André Przywara wrote:
> On 03/01/2021 10:00, Samuel Holland wrote:
> > On boards where the only peripheral connected to PL0/PL1 is an X-Powers
> > PMIC, configure the connection to use the RSB bus rather than the I2C
> > bus. Compared to the I2C controller that shares the pins, the RSB
> > controller allows a higher bus frequency, and it is more CPU-efficient.
>
> But is it really necessary to change the DTs for those boards in this
> way? It means those newer DTs now become incompatible with older
> kernels, and I don't know if those reasons above really justify this.
>
> I understand that we officially don't care about "newer DTs on older
> kernels", but do we really need to break this deliberately, for no
> pressing reasons?
>
> P.S. I am fine with supporting RSB on H6, and even using it on new DTs,
> just want to avoid breaking existing ones.
Doing so would also introduce some inconsistencies, one more thing to
consider during reviews, and would require more testing effort.
I'm not sure that stretching our - already fairly sparse - resources
thin would be very wise here, especially for something that we don't
have to do and for a setup that isn't really used that much.
Maxime
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next prev parent reply other threads:[~2021-01-06 11:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-03 10:00 [PATCH v2 0/4] Allwinner H6 RSB support Samuel Holland
2021-01-03 10:00 ` [PATCH v2 1/4] clk: sunxi-ng: h6-r: Add R_APB2_RSB clock and reset Samuel Holland
2021-01-03 10:00 ` [PATCH v2 2/4] pinctrl: sunxi: h6-r: Add s_rsb pin functions Samuel Holland
2021-01-03 14:19 ` [linux-sunxi] " Chen-Yu Tsai
2021-01-05 22:35 ` Linus Walleij
2021-01-06 2:39 ` Chen-Yu Tsai
2021-01-06 20:10 ` Linus Walleij
2021-01-03 10:00 ` [PATCH v2 3/4] arm64: dts: allwinner: h6: Add RSB controller node Samuel Holland
2021-01-03 10:00 ` [PATCH v2 4/4] arm64: dts: allwinner: h6: Use RSB for AXP805 PMIC connection Samuel Holland
2021-01-04 10:54 ` André Przywara
2021-01-05 3:31 ` Samuel Holland
2021-01-06 11:06 ` Maxime Ripard [this message]
2021-01-06 11:38 ` Chen-Yu Tsai
2021-01-07 10:27 ` Samuel Holland
2021-01-13 9:16 ` [linux-sunxi] " Chen-Yu Tsai
2021-01-18 9:51 ` Chen-Yu Tsai
2021-03-08 15:45 ` Maxime Ripard
2021-01-04 8:31 ` [linux-sunxi] [PATCH v2 0/4] Allwinner H6 RSB support Chen-Yu Tsai
2021-01-06 11:04 ` Maxime Ripard
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