linux-kernel - Re: [PATCH v5 2/8] clk: rockchip: rk3036: fix and add node id for emac clock

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Date:	Sun, 21 Feb 2016 03:26:56 +0100
From:	Heiko Stuebner <heiko@...ech.de>
To:	Caesar Wang <wxt@...k-chips.com>,
	zhengxing <zhengxing@...k-chips.com>
Cc:	linux-rockchip@...ts.infradead.org, keescook@...gle.com,
	linux-kernel@...r.kernel.org, jeffy.chen@...k-chips.com,
	leozwang@...gle.com
Subject: Re: [PATCH v5 2/8] clk: rockchip: rk3036: fix and add node id for emac clock

Hi Caesar, Xing,

Am Dienstag, 2. Februar 2016, 11:48:19 schrieb Caesar Wang:
> From: zhengxing <zhengxing@...k-chips.com>
> 
> In the emac driver, we need to refer HCLK_MAC since there are
> only 3PLLs (APLL/GPLL/DPLL) on the rk3036, most clock are under the
> GPLL, and it is unable to provide the accurate rate for mac_ref which
> need to 50MHz probability, we should let it under the DPLL and are
> able to set the freq which integer multiples of 50MHz, so we add these
> emac node for reference.
> 
> Signed-off-by: Xing Zheng <zhengxing@...k-chips.com>
> Signed-off-by: Caesar Wang <wxt@...k-chips.com>

[...]

> --- a/drivers/clk/rockchip/clk-rk3036.c
> +++ b/drivers/clk/rockchip/clk-rk3036.c
> @@ -343,8 +343,11 @@ static struct rockchip_clk_branch
> rk3036_clk_branches[] __initdata = { RK2928_CLKSEL_CON(16), 0, 2, MFLAGS,
> 2, 5, DFLAGS,
>  			RK2928_CLKGATE_CON(10), 5, GFLAGS),
> 
> -	COMPOSITE_NOGATE(0, "mac_pll_src", mux_pll_src_3plls_p, 0,
> -			RK2928_CLKSEL_CON(21), 0, 2, MFLAGS, 9, 5, DFLAGS),
> +	MUX(SCLK_MACPLL, "mac_pll_pre", mux_pll_src_3plls_p, 0,
> +			RK2928_CLKSEL_CON(21), 0, 2, MFLAGS),
> +	DIV(0, "mac_pll_src", "mac_pll_pre", 0,
> +			RK2928_CLKSEL_CON(21), 9, 5, DFLAGS),
> +

CLK_SET_RATE_NO_REPARENT should do the trick as well.

And the whole hclk + clkid part should be separate patches. I took the 
liberty of splitting them already in [0] to see if I could get the emac 
running on my kylin board.

Probing emac + phy does suceed, but there is no link-detection.
Building your kylin-develop4.4 branch [1] results in the same (aka no 
transmission). 

Only with the original uboot + 4.1-based kernel that was already on the 
device did I manage to get a network connection.

Is there some additional setup missing somewhere?


Heiko

[0] https://github.com/mmind/linux-rockchip/commits/tmp/rk3036-emac
The 3 additional patches are not strictly necessary there.

[1] https://github.com/rockchip-linux/kernel/tree/kylin-develop4.4