Commit fa4794ff authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Krzysztof Kozlowski
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memory: tegra20-emc: Continue probing if timings are missing in device-tree 



EMC driver will become mandatory after turning it into interconnect
provider because interconnect users, like display controller driver, will
fail to probe using newer device-trees that have interconnect properties.
Thus make EMC driver to probe even if timings are missing in device-tree.

Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201104164923.21238-35-digetx@gmail.com


Signed-off-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
parent 0260979b

drivers/memory/tegra/tegra20-emc.c

+16 −18
Original line number Diff line number Diff line
@@ -383,6 +383,11 @@ tegra_emc_find_node_by_ram_code(struct device *dev) 
	u32 value, ram_code;

	int err;



	if (of_get_child_count(dev->of_node) == 0) {

		dev_info(dev, "device-tree doesn't have memory timings\n");

		return NULL;

	}



	if (!of_property_read_bool(dev->of_node, "nvidia,use-ram-code"))

		return of_node_get(dev->of_node);
@@ -451,6 +456,9 @@ static long emc_round_rate(unsigned long rate, 
	struct tegra_emc *emc = arg;

	unsigned int i;



	if (!emc->num_timings)

		return clk_get_rate(emc->clk);



	min_rate = min(min_rate, emc->timings[emc->num_timings - 1].rate);



	for (i = 0; i < emc->num_timings; i++) {
@@ -656,36 +664,26 @@ static int tegra_emc_probe(struct platform_device *pdev) 
	struct tegra_emc *emc;

	int irq, err;



	/* driver has nothing to do in a case of memory timing absence */

	if (of_get_child_count(pdev->dev.of_node) == 0) {

		dev_info(&pdev->dev,

			 "EMC device tree node doesn't have memory timings\n");

		return 0;

	}



	irq = platform_get_irq(pdev, 0);

	if (irq < 0) {

		dev_err(&pdev->dev, "please update your device tree\n");

		return irq;

	}



	np = tegra_emc_find_node_by_ram_code(&pdev->dev);

	if (!np)

		return -EINVAL;



	emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);

	if (!emc) {

		of_node_put(np);

	if (!emc)

		return -ENOMEM;

	}



	emc->clk_nb.notifier_call = tegra_emc_clk_change_notify;

	emc->dev = &pdev->dev;



	np = tegra_emc_find_node_by_ram_code(&pdev->dev);

	if (np) {

		err = tegra_emc_load_timings_from_dt(emc, np);

		of_node_put(np);

		if (err)

			return err;

	}



	emc->regs = devm_platform_ioremap_resource(pdev, 0);

	if (IS_ERR(emc->regs))

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