linux-kernel - Re: [PATCH 06/22] clk: renesas: r9a09g047: Add support for SMUX2_DSI{0,1}

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Message-ID: <CAMuHMdVpgnCXVzuZ7ZJQ8dy4Yae=zse3pq=r-g3frymbSVRpVg@mail.gmail.com>
Date: Fri, 9 Jan 2026 19:38:40 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
Cc: tomm.merciai@...il.com, linux-renesas-soc@...r.kernel.org, 
	biju.das.jz@...renesas.com, Andrzej Hajda <andrzej.hajda@...el.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, 
	Magnus Damm <magnus.damm@...il.com>, dri-devel@...ts.freedesktop.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-clk@...r.kernel.org
Subject: Re: [PATCH 06/22] clk: renesas: r9a09g047: Add support for SMUX2_DSI{0,1}_CLK

Hi Tommaso,

On Wed, 26 Nov 2025 at 15:10, Tommaso Merciai
<tommaso.merciai.xr@...renesas.com> wrote:
> Add support for the SMUX2_DSI0_CLK and SMUX2_DSI1_CLK clock muxes
> present on the r9a09g047 SoC.
>
> These muxes select between CDIV7_DSI{0,1}_CLK and CSDIV_2to16_PLLDSI{0,1}
> using the CPG_SSEL3 register (SELCTL0 and SELCTL1 bits).
>
> According to the hardware manual, when LVDS0 or LVDS1 outputs are used,
> SELCTL0 or SELCTL1 must be set accordingly.
>
> Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>

Thanks for your patch!

> --- a/drivers/clk/renesas/r9a09g047-cpg.c
> +++ b/drivers/clk/renesas/r9a09g047-cpg.c
> @@ -64,6 +64,8 @@ enum clk_ids {
>         CLK_SMUX2_GBE0_RXCLK,
>         CLK_SMUX2_GBE1_TXCLK,
>         CLK_SMUX2_GBE1_RXCLK,
> +       CLK_SMUX2_DSI0_CLK,
> +       CLK_SMUX2_DSI1_CLK,

Please move these up, before CLK_SMUX2_GBE0_TXCLK.

>         CLK_PLLDTY_DIV16,
>         CLK_PLLVDO_CRU0,
>         CLK_PLLVDO_GPU,
> @@ -143,6 +145,8 @@ RZG3E_CPG_PLL_DSI1_LIMITS(rzg3e_cpg_pll_dsi1_limits);
>  #define PLLDSI1                PLL_PACK_LIMITS(0x160, 1, 1, &rzg3e_cpg_pll_dsi1_limits)
>
>  /* Mux clock tables */
> +static const char * const smux2_dsi0_clk[] = { ".plldsi0_div7", ".plldsi0_csdiv" };
> +static const char * const smux2_dsi1_clk[] = { ".plldsi1_div7", ".plldsi1_csdiv" };
>  static const char * const smux2_gbe0_rxclk[] = { ".plleth_gbe0", "et0_rxclk" };
>  static const char * const smux2_gbe0_txclk[] = { ".plleth_gbe0", "et0_txclk" };
>  static const char * const smux2_gbe1_rxclk[] = { ".plleth_gbe1", "et1_rxclk" };
> @@ -218,6 +222,10 @@ static const struct cpg_core_clk r9a09g047_core_clks[] __initconst = {
>                        CSDIV1_DIVCTL3, dtable_2_16_plldsi),
>         DEF_FIXED(".plldsi0_div7", CLK_PLLDSI0_DIV7, CLK_PLLDSI0, 1, 7),
>         DEF_FIXED(".plldsi1_div7", CLK_PLLDSI1_DIV7, CLK_PLLDSI1, 1, 7),
> +       DEF_PLLDSI_SMUX(".smux2_dsi0_clk", CLK_SMUX2_DSI0_CLK,
> +                       SSEL3_SELCTL0, smux2_dsi0_clk),
> +       DEF_PLLDSI_SMUX(".smux2_dsi1_clk", CLK_SMUX2_DSI1_CLK,
> +                       SSEL3_SELCTL1, smux2_dsi1_clk),

Why can't these use the existing DEF_SMUX()?
>
>         /* Core Clocks */
>         DEF_FIXED("sys_0_pclk", R9A09G047_SYS_0_PCLK, CLK_QEXTAL, 1, 1),

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