Commit 59a0ea50 authored by Anton Vorontsov's avatar Anton Vorontsov Committed by Kumar Gala
Browse files

spi_mpc83xx: use brg-frequency for SPI in QE 



In case of QE we can use brg-frequency (which is qeclk/2).
Thus no need to divide sysclk in the spi_mpc83xx.

This patch also adds code to use get_brgfreq() on QE chips.

Signed-off-by: default avatarAnton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
parent d0a2f82d

arch/powerpc/sysdev/fsl_soc.c

+33 −13
Original line number Diff line number Diff line
@@ -75,7 +75,7 @@ phys_addr_t get_immrbase(void) 


EXPORT_SYMBOL(get_immrbase);



#if defined(CONFIG_CPM2) || defined(CONFIG_8xx)

#if defined(CONFIG_CPM2) || defined(CONFIG_QUICC_ENGINE) || defined(CONFIG_8xx)



static u32 brgfreq = -1;
@@ -100,11 +100,21 @@ u32 get_brgfreq(void) 


	/* Legacy device binding -- will go away when no users are left. */

	node = of_find_node_by_type(NULL, "cpm");

	if (!node)

		node = of_find_compatible_node(NULL, NULL, "fsl,qe");

	if (!node)

		node = of_find_node_by_type(NULL, "qe");



	if (node) {

		prop = of_get_property(node, "brg-frequency", &size);

		if (prop && size == 4)

			brgfreq = *prop;



		if (brgfreq == -1 || brgfreq == 0) {

			prop = of_get_property(node, "bus-frequency", &size);

			if (prop && size == 4)

				brgfreq = *prop / 2;

		}

		of_node_put(node);

	}
@@ -1273,22 +1283,32 @@ int __init fsl_spi_init(struct spi_board_info *board_infos, 
{

	struct device_node *np;

	unsigned int i;

	const u32 *sysclk;

	u32 sysclk = -1;



	/* SPI controller is either clocked from QE or SoC clock */

	np = of_find_compatible_node(NULL, NULL, "fsl,qe");

	if (!np)

		np = of_find_node_by_type(NULL, "qe");

#ifdef CONFIG_QUICC_ENGINE

	sysclk = get_brgfreq();

#endif

	if (sysclk == -1) {

		const u32 *freq;

		int size;



	if (!np)

		np = of_find_node_by_type(NULL, "soc");



		if (!np)

			return -ENODEV;



	sysclk = of_get_property(np, "bus-frequency", NULL);

	if (!sysclk)

		freq = of_get_property(np, "clock-frequency", &size);

		if (!freq || size != sizeof(*freq) || *freq == 0) {

			freq = of_get_property(np, "bus-frequency", &size);

			if (!freq || size != sizeof(*freq) || *freq == 0) {

				of_node_put(np);

				return -ENODEV;

			}

		}



		sysclk = *freq;

		of_node_put(np);

	}



	for (np = NULL, i = 1;

	     (np = of_find_compatible_node(np, "spi", "fsl_spi")) != NULL;
@@ -1305,7 +1325,7 @@ int __init fsl_spi_init(struct spi_board_info *board_infos, 


		memset(res, 0, sizeof(res));



		pdata.sysclk = *sysclk;

		pdata.sysclk = sysclk;



		prop = of_get_property(np, "reg", NULL);

		if (!prop)

drivers/spi/spi_mpc83xx.c

+1 −5
Original line number Diff line number Diff line
@@ -436,10 +436,6 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev) 
	mpc83xx_spi->qe_mode = pdata->qe_mode;

	mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8;

	mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8;



	if (mpc83xx_spi->qe_mode)

		mpc83xx_spi->spibrg = pdata->sysclk / 2;

	else

	mpc83xx_spi->spibrg = pdata->sysclk;



	mpc83xx_spi->rx_shift = 0;

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