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

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Message-ID: <aWZNy7MmeO-obgYr@tom-desktop>
Date: Tue, 13 Jan 2026 14:51:07 +0100
From: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
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 Geert,
Thanks for your review.

On Fri, Jan 09, 2026 at 07:38:40PM +0100, Geert Uytterhoeven wrote:
> 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.

Ack.

> 
> >         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()?

Same comment of [0].

Kind Regards,
Tommaso

[0] https://patchwork.kernel.org/comment/26730109/

> >
> >         /* 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