Re: [PATCH 5/6] clk: tegra: Add support for Tegra132 CAR clocks

Thierry Reding
2014-07-16T07:44:10Z

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On Tue, Jul 15, 2014 at 06:24:35PM +0300, Peter De Schrijver wrote:
> Tegra132 CAR supports almost the same clocks as Tegra124 CAR. This patch
> deals with the small differences.
>
> --
> I'm not entirely sure why the soc_therm clock needs to be enabled on Tegra132,
> but turning it off results in a system hang. I presume this might be because
> of fastboot initializing soc_therm.
>
> Signed-off-by: Peter De Schrijver <pdeschrijver-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> ---
> drivers/clk/tegra/clk-tegra124.c | 32 ++++++++++++++++++++++++++++++++
> 1 files changed, 32 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/clk/tegra/clk-tegra124.c b/drivers/clk/tegra/clk-tegra124.c
> index 80efe51..b857aab 100644
> --- a/drivers/clk/tegra/clk-tegra124.c
> +++ b/drivers/clk/tegra/clk-tegra124.c
> @@ -1369,6 +1369,7 @@ static struct tegra_clk_init_table init_table[] __initdata = {
> {TEGRA124_CLK_XUSB_HS_SRC, TEGRA124_CLK_PLL_U_60M, 60000000, 0},
> {TEGRA124_CLK_XUSB_FALCON_SRC, TEGRA124_CLK_PLL_RE_OUT, 224000000, 0},
> {TEGRA124_CLK_XUSB_HOST_SRC, TEGRA124_CLK_PLL_RE_OUT, 112000000, 0},
> + {TEGRA124_CLK_SOC_THERM, TEGRA124_CLK_PLL_P, 51000000, 0},
> /* This MUST be the last entry. */
> {TEGRA124_CLK_CLK_MAX, TEGRA124_CLK_CLK_MAX, 0, 0},
> };
> @@ -1378,9 +1379,25 @@ static void __init tegra124_clock_apply_init_table(void)
> tegra_init_from_table(init_table, clks, TEGRA124_CLK_CLK_MAX);
> }
>
> +enum {
> + TEGRA124_CLK,
> + TEGRA132_CLK,
> +};

I'd prefer this to be something like:

struct tegra_car_soc {
bool has_ccplex_clk;
};

static const struct tegra_car_soc tegra124_car_soc = {
.has_ccplex_clk = false,
};

static const struct tegra_car_soc tegra132_car_soc = {
.has_ccplex_clk = true,
};

> +static const struct of_device_id tegra_clock_of_match[] = {
> + { .compatible = "nvidia,tegra124-car", .data = (void *)TEGRA124_CLK },

.data = &tegra124_car_soc,

> + { .compatible = "nvidia,tegra132-car", .data = (void *)TEGRA132_CLK },

.data = &tegra132_car_soc,

> static void __init tegra124_clock_init(struct device_node *np)
> {
> struct device_node *node;
> + const struct of_device_id *match;

const struct tegra_car_soc *soc;

> + uintptr_t id;

> + match = of_match_node(tegra_clock_of_match, np);
> + id = (uintptr_t)match->data;

soc = match->data;

>
> clk_base = of_iomap(np, 0);
> if (!clk_base) {
> @@ -1416,6 +1433,20 @@ static void __init tegra124_clock_init(struct device_node *np)
> tegra_audio_clk_init(clk_base, pmc_base, tegra124_clks, &pll_a_params);
> tegra_pmc_clk_init(pmc_base, tegra124_clks);
>
> + if (id == TEGRA132_CLK) {

if (soc->has_ccplex_clk) {

That's somewhat more explicit and avoids a lot of ugly casting.

> + int i;
> +
> + tegra124_clks[tegra_clk_cclk_g].present = false;
> + tegra124_clks[tegra_clk_cclk_lp].present = false;
> + tegra124_clks[tegra_clk_pll_x].present = false;
> + tegra124_clks[tegra_clk_pll_x_out0].present = false;
> +
> + /* Tegra132 requires the soc_therm clock to be always on */
> + for (i = 0; i < ARRAY_SIZE(init_table); i++) {
> + if (init_table[i].clk_id == TEGRA124_CLK_SOC_THERM)
> + init_table[i].state = 1;

I wonder if we could do this someplace else. If we could, then we'd have
the opportunity to make the init_table const.

> + }
> + }
> tegra_super_clk_gen4_init(clk_base, pmc_base, tegra124_clks,

Could use a blank line after the closing } above.

Thierry

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