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Message-ID: <CAMuHMdUmj+m8WLaSfwELD0VGYFpDaACTLgerbznBeqfVVy2nzw@mail.gmail.com>
Date: Mon, 27 Apr 2020 11:10:29 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc: Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Magnus Damm <magnus.damm@...il.com>,
Russell King <linux@...linux.org.uk>,
Marian-Cristian Rotariu
<marian-cristian.rotariu.rb@...renesas.com>,
linux-clk <linux-clk@...r.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
Linux PM list <linux-pm@...r.kernel.org>,
Lad Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH 08/10] clk: renesas: cpg-mssr: Add R8A7742 support
Hi Prabhakar,
On Thu, Apr 23, 2020 at 11:41 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> Add RZ/G1H (R8A7742) Clock Pulse Generator / Module Standby and Software
> Reset support, using the CPG/MSSR driver core and the common R-Car Gen2
> (and RZ/G) code.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@...renesas.com>
Thanks for your patch!
> --- /dev/null
> +++ b/drivers/clk/renesas/r8a7742-cpg-mssr.c
> +static struct cpg_core_clk r8a7742_core_clks[] __initdata = {
> + /* External Clock Inputs */
> + DEF_INPUT("extal", CLK_EXTAL),
> + DEF_INPUT("usb_extal", CLK_USB_EXTAL),
> +
> + /* Internal Core Clocks */
> + DEF_BASE(".main", CLK_MAIN, CLK_TYPE_GEN2_MAIN, CLK_EXTAL),
> + DEF_BASE(".pll0", CLK_PLL0, CLK_TYPE_GEN2_PLL0, CLK_MAIN),
> + DEF_BASE(".pll1", CLK_PLL1, CLK_TYPE_GEN2_PLL1, CLK_MAIN),
> + DEF_BASE(".pll3", CLK_PLL3, CLK_TYPE_GEN2_PLL3, CLK_MAIN),
> +
> + DEF_FIXED(".pll1_div2", CLK_PLL1_DIV2, CLK_PLL1, 2, 1),
> +
> + /* Core Clock Outputs */
> + DEF_BASE("z", R8A7742_CLK_Z, CLK_TYPE_GEN2_Z, CLK_PLL0),
> + DEF_BASE("sdh", R8A7742_CLK_SDH, CLK_TYPE_GEN2_SDH, CLK_PLL1),
> + DEF_BASE("sd0", R8A7742_CLK_SD0, CLK_TYPE_GEN2_SD0, CLK_PLL1),
> + DEF_BASE("sd1", R8A7742_CLK_SD1, CLK_TYPE_GEN2_SD1, CLK_PLL1),
> + DEF_BASE("qspi", R8A7742_CLK_QSPI, CLK_TYPE_GEN2_QSPI, CLK_PLL1_DIV2),
> + DEF_BASE("rcan", R8A7742_CLK_RCAN, CLK_TYPE_GEN2_RCAN, CLK_USB_EXTAL),
> +
> + DEF_FIXED("z2", R8A7742_CLK_Z2, CLK_PLL1, 2, 1),
> + DEF_FIXED("zg", R8A7742_CLK_ZG, CLK_PLL1, 3, 1),
> + DEF_FIXED("zt", R8A7742_CLK_ZT, CLK_PLL1, 5, 1),
> + DEF_FIXED("ztr", R8A7742_CLK_ZTR, CLK_PLL1, 4, 1),
> + DEF_FIXED("ztrd2", R8A7742_CLK_ZTRD2, CLK_PLL1, 12, 1),
The ZT* clocks are not fixed-factor clocks, but use programmable
dividers in FRQCRB.
So either you implement them correctly, or you drop them, like we did
for the other R-Car Gen2 and RZ/G1 SoCs (there are no users yet).
> + DEF_FIXED("zx", R8A7742_CLK_ZX, CLK_PLL1, 3, 1),
> + DEF_FIXED("zs", R8A7742_CLK_ZS, CLK_PLL1, 6, 1),
> + DEF_FIXED("hp", R8A7742_CLK_HP, CLK_PLL1, 12, 1),
> + DEF_FIXED("b", R8A7742_CLK_B, CLK_PLL1, 12, 1),
> + DEF_FIXED("lb", R8A7742_CLK_LB, CLK_PLL1, 24, 1),
Please use CLK_TYPE_GEN2_LB, as the LB divider depends on the state of
mode pin MD18.
> + DEF_FIXED("p", R8A7742_CLK_P, CLK_PLL1, 24, 1),
> + DEF_FIXED("cl", R8A7742_CLK_CL, CLK_PLL1, 48, 1),
> + DEF_FIXED("m2", R8A7742_CLK_M2, CLK_PLL1, 8, 1),
> + DEF_FIXED("zb3", R8A7742_CLK_ZB3, CLK_PLL3, 4, 1),
> + DEF_FIXED("zb3d2", R8A7742_CLK_ZB3D2, CLK_PLL3, 8, 1),
> + DEF_FIXED("ddr", R8A7742_CLK_DDR, CLK_PLL3, 8, 1),
> + DEF_FIXED("mp", R8A7742_CLK_MP, CLK_PLL1_DIV2, 15, 1),
> + DEF_FIXED("cp", R8A7742_CLK_CP, CLK_EXTAL, 2, 1),
> + DEF_FIXED("r", R8A7742_CLK_R, CLK_PLL1, 49152, 1),
> + DEF_FIXED("osc", R8A7742_CLK_OSC, CLK_PLL1, 12288, 1),
> +
> + DEF_DIV6P1("sd2", R8A7742_CLK_SD2, CLK_PLL1_DIV2, 0x078),
> + DEF_DIV6P1("sd3", R8A7742_CLK_SD3, CLK_PLL1_DIV2, 0x26c),
> + DEF_DIV6P1("mmc0", R8A7742_CLK_MMC0, CLK_PLL1_DIV2, 0x240),
> + DEF_DIV6P1("mmc1", R8A7742_CLK_MMC1, CLK_PLL1_DIV2, 0x244),
> +};
> +
> +static const struct mssr_mod_clk r8a7742_mod_clks[] __initconst = {
> + DEF_MOD("msiof0", 0, R8A7742_CLK_MP),
> + DEF_MOD("vcp1", 100, R8A7742_CLK_ZS),
> + DEF_MOD("vcp0", 101, R8A7742_CLK_ZS),
> + DEF_MOD("vpc1", 102, R8A7742_CLK_ZS),
> + DEF_MOD("vpc0", 103, R8A7742_CLK_ZS),
> + DEF_MOD("tmu1", 111, R8A7742_CLK_P),
> + DEF_MOD("3dg", 112, R8A7742_CLK_ZG),
> + DEF_MOD("2d-dmac", 115, R8A7742_CLK_ZS),
> + DEF_MOD("fdp1-2", 117, R8A7742_CLK_ZS),
> + DEF_MOD("fdp1-1", 118, R8A7742_CLK_ZS),
> + DEF_MOD("fdp1-0", 119, R8A7742_CLK_ZS),
> + DEF_MOD("tmu3", 121, R8A7742_CLK_P),
> + DEF_MOD("tmu2", 122, R8A7742_CLK_P),
> + DEF_MOD("cmt0", 124, R8A7742_CLK_R),
> + DEF_MOD("tmu0", 125, R8A7742_CLK_CP),
> + DEF_MOD("vsp1du1", 127, R8A7742_CLK_ZS),
> + DEF_MOD("vsp1du0", 128, R8A7742_CLK_ZS),
> + DEF_MOD("vsp1-sy", 131, R8A7742_CLK_ZS),
> + DEF_MOD("scifa2", 202, R8A7742_CLK_MP),
> + DEF_MOD("scifa1", 203, R8A7742_CLK_MP),
> + DEF_MOD("scifa0", 204, R8A7742_CLK_MP),
> + DEF_MOD("msiof2", 205, R8A7742_CLK_MP),
> + DEF_MOD("scifb0", 206, R8A7742_CLK_MP),
> + DEF_MOD("scifb1", 207, R8A7742_CLK_MP),
> + DEF_MOD("msiof1", 208, R8A7742_CLK_MP),
> + DEF_MOD("msiof3", 215, R8A7742_CLK_MP),
> + DEF_MOD("scifb2", 216, R8A7742_CLK_MP),
> + DEF_MOD("sys-dmac1", 218, R8A7742_CLK_ZS),
> + DEF_MOD("sys-dmac0", 219, R8A7742_CLK_ZS),
> + DEF_MOD("iic2", 300, R8A7742_CLK_CP),
Parent should be R8A7742_CLK_HP.
> + DEF_MOD("tpu0", 304, R8A7742_CLK_CP),
> + DEF_MOD("mmcif1", 305, R8A7742_CLK_MMC1),
> + DEF_MOD("scif2", 310, R8A7742_CLK_CP),
Parent should be R8A7742_CLK_P.
> + DEF_MOD("sdhi3", 311, R8A7742_CLK_SD3),
> + DEF_MOD("sdhi2", 312, R8A7742_CLK_SD2),
> + DEF_MOD("sdhi1", 313, R8A7742_CLK_SD2),
Parent should be R8A7742_CLK_SD1.
> +static int __init r8a7742_cpg_mssr_init(struct device *dev)
> +{
> + const struct rcar_gen2_cpg_pll_config *cpg_pll_config;
> + struct device_node *np = dev->of_node;
> + unsigned int i;
> + u32 cpg_mode;
> + int error;
> +
> + error = rcar_rst_read_mode_pins(&cpg_mode);
> + if (error)
> + return error;
> +
> + cpg_pll_config = &cpg_pll_configs[CPG_PLL_CONFIG_INDEX(cpg_mode)];
> +
> + if (of_device_is_compatible(np, "renesas,r8a7742-cpg-mssr")) {
> + /* RZ/G1H uses a 1/3 divider for ZG */
> + for (i = 0; i < ARRAY_SIZE(r8a7742_core_clks); i++)
> + if (r8a7742_core_clks[i].id == R8A7742_CLK_ZG) {
> + r8a7742_core_clks[i].div = 3;
> + break;
> + }
> + }
Do you really need this part? (copied from r8a7743-cpg-mssr.c ;-)
If you remove it, r8a7742_core_clks[] can be const, and <linux/of.h> is
no longer needed,
> + return rcar_gen2_cpg_init(cpg_pll_config, 2, cpg_mode);
> +}
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
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