linux-kernel - Re: [PATCH v1 1/5] clk: tegra: Add AHB DMA clock entry

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Date:   Tue, 26 Sep 2017 12:56:11 +0300
From:   Peter De Schrijver <pdeschrijver@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>
CC:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        "Prashant Gaikwad" <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Vinod Koul" <vinod.koul@...el.com>, <linux-tegra@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/5] clk: tegra: Add AHB DMA clock entry

On Tue, Sep 26, 2017 at 02:22:02AM +0300, Dmitry Osipenko wrote:
> AHB DMA presents on Tegra20/30. Add missing entries, so that driver
> for AHB DMA could be implemented.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/clk/tegra/clk-id.h           | 1 +
>  drivers/clk/tegra/clk-tegra-periph.c | 1 +
>  drivers/clk/tegra/clk-tegra20.c      | 6 ++++++
>  drivers/clk/tegra/clk-tegra30.c      | 2 ++
>  4 files changed, 10 insertions(+)
> 
> diff --git a/drivers/clk/tegra/clk-id.h b/drivers/clk/tegra/clk-id.h
> index 689f344377a7..c1661b47bbda 100644
> --- a/drivers/clk/tegra/clk-id.h
> +++ b/drivers/clk/tegra/clk-id.h
> @@ -12,6 +12,7 @@ enum clk_id {
>  	tegra_clk_amx,
>  	tegra_clk_amx1,
>  	tegra_clk_apb2ape,
> +	tegra_clk_ahbdma,
>  	tegra_clk_apbdma,
>  	tegra_clk_apbif,
>  	tegra_clk_ape,
> diff --git a/drivers/clk/tegra/clk-tegra-periph.c b/drivers/clk/tegra/clk-tegra-periph.c
> index 848255cc0209..95a3d8c95f06 100644
> --- a/drivers/clk/tegra/clk-tegra-periph.c
> +++ b/drivers/clk/tegra/clk-tegra-periph.c
> @@ -823,6 +823,7 @@ static struct tegra_periph_init_data gate_clks[] = {
>  	GATE("timer", "clk_m", 5, 0, tegra_clk_timer, CLK_IS_CRITICAL),
>  	GATE("isp", "clk_m", 23, 0, tegra_clk_isp, 0),
>  	GATE("vcp", "clk_m", 29, 0, tegra_clk_vcp, 0),
> +	GATE("ahbdma", "clk_m", 33, 0, tegra_clk_ahbdma, 0),

Parent for this should be hclk on Tegra30 and later chips as well..

>  	GATE("apbdma", "clk_m", 34, 0, tegra_clk_apbdma, 0),
>  	GATE("kbc", "clk_32k", 36, TEGRA_PERIPH_ON_APB | TEGRA_PERIPH_NO_RESET, tegra_clk_kbc, 0),
>  	GATE("fuse", "clk_m", 39, TEGRA_PERIPH_ON_APB, tegra_clk_fuse, 0),
> diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c
> index 837e5cbd60e9..e76c0d292ca7 100644
> --- a/drivers/clk/tegra/clk-tegra20.c
> +++ b/drivers/clk/tegra/clk-tegra20.c
> @@ -449,6 +449,7 @@ static struct tegra_devclk devclks[] __initdata = {
>  	{ .con_id = "audio", .dt_id = TEGRA20_CLK_AUDIO },
>  	{ .con_id = "audio_2x", .dt_id = TEGRA20_CLK_AUDIO_2X },
>  	{ .dev_id = "tegra20-ac97", .dt_id = TEGRA20_CLK_AC97 },
> +	{ .dev_id = "tegra-ahbdma", .dt_id = TEGRA20_CLK_AHBDMA },

This isn't needed if you use DT bindings to get the clock handle.

>  	{ .dev_id = "tegra-apbdma", .dt_id = TEGRA20_CLK_APBDMA },
>  	{ .dev_id = "rtc-tegra", .dt_id = TEGRA20_CLK_RTC },
>  	{ .dev_id = "timer", .dt_id = TEGRA20_CLK_TIMER },
> @@ -806,6 +807,11 @@ static void __init tegra20_periph_clk_init(void)
>  				    clk_base, 0, 3, periph_clk_enb_refcnt);
>  	clks[TEGRA20_CLK_AC97] = clk;
>  
> +	/* ahbdma */
> +	clk = tegra_clk_register_periph_gate("ahbdma", "hclk", 0, clk_base,
> +				    0, 33, periph_clk_enb_refcnt);
> +	clks[TEGRA20_CLK_AHBDMA] = clk;
> +

You can use the generic definition here if you correct the entry above.

>  	/* apbdma */
>  	clk = tegra_clk_register_periph_gate("apbdma", "pclk", 0, clk_base,
>  				    0, 34, periph_clk_enb_refcnt);
> diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c
> index a2d163f759b4..e99701557f29 100644
> --- a/drivers/clk/tegra/clk-tegra30.c
> +++ b/drivers/clk/tegra/clk-tegra30.c
> @@ -612,6 +612,7 @@ static struct tegra_devclk devclks[] __initdata = {
>  	{ .con_id = "fuse_burn", .dev_id = "fuse-tegra", .dt_id = TEGRA30_CLK_FUSE_BURN },
>  	{ .con_id = "apbif", .dev_id = "tegra30-ahub", .dt_id = TEGRA30_CLK_APBIF },
>  	{ .con_id = "hda2hdmi", .dev_id = "tegra30-hda", .dt_id = TEGRA30_CLK_HDA2HDMI },
> +	{ .dev_id = "tegra-ahbdma", .dt_id = TEGRA30_CLK_AHBDMA },

Same as for Tegra20.

>  	{ .dev_id = "tegra-apbdma", .dt_id = TEGRA30_CLK_APBDMA },
>  	{ .dev_id = "rtc-tegra", .dt_id = TEGRA30_CLK_RTC },
>  	{ .dev_id = "timer", .dt_id = TEGRA30_CLK_TIMER },
> @@ -788,6 +789,7 @@ static struct tegra_clk tegra30_clks[tegra_clk_max] __initdata = {
>  	[tegra_clk_extern3] = { .dt_id = TEGRA30_CLK_EXTERN3, .present = true },
>  	[tegra_clk_disp1] = { .dt_id = TEGRA30_CLK_DISP1, .present = true },
>  	[tegra_clk_disp2] = { .dt_id = TEGRA30_CLK_DISP2, .present = true },
> +	[tegra_clk_ahbdma] = { .dt_id = TEGRA30_CLK_AHBDMA, .present = true },
>  	[tegra_clk_apbdma] = { .dt_id = TEGRA30_CLK_APBDMA, .present = true },
>  	[tegra_clk_rtc] = { .dt_id = TEGRA30_CLK_RTC, .present = true },
>  	[tegra_clk_timer] = { .dt_id = TEGRA30_CLK_TIMER, .present = true },

Cheers,

Peter.