linux-kernel - Re: [PATCH v2 2/2] spi: fsl-spi: Allow dynamic allocation of CPM1 parameter RAM

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Date:	Fri, 3 Oct 2014 14:51:48 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Christophe Leroy <christophe.leroy@....fr>
CC:	Mark Brown <broonie@...nel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>, <linux-spi@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] spi: fsl-spi: Allow dynamic allocation of CPM1
 parameter RAM

On Fri, 2014-10-03 at 18:49 +0200, Christophe Leroy wrote:
> On CPM1, the SPI parameter RAM has a default location. In order to use SPI while
> using SCC2 with features like QMC or Ethernet, it is necessary to relocate SPI
> parameter RAM in a free location in the CPM dual port RAM.

Please explain in more detail why it's necessary.

>  With this patch,
> when "fsl,cpm1-spi-reloc" instead of "fsl,cpm1-spi" compatible is set in the
> device tree, the parameter RAM for SPI is dynamically allocated
> with cpm_muram_alloc().
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> 
> ---
> Changes from v1 to v2: using OF compatible instead of compile time option
> 
>  drivers/spi/spi-fsl-cpm.c   | 3 +++
>  drivers/spi/spi-fsl-lib.c   | 2 ++
>  include/linux/fsl_devices.h | 1 +
>  3 files changed, 6 insertions(+)
> 
> diff --git a/drivers/spi/spi-fsl-cpm.c b/drivers/spi/spi-fsl-cpm.c
> index 0f3a912..048ca5f 100644
> --- a/drivers/spi/spi-fsl-cpm.c
> +++ b/drivers/spi/spi-fsl-cpm.c
> @@ -261,6 +261,9 @@ static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
>  	if (mspi->flags & SPI_CPM2) {
>  		pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
>  		out_be16(spi_base, pram_ofs);
> +	} else if (mspi->flags & SPI_CPM1_RELOC) {
> +		pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 32);
> +		out_be16(spi_base, pram_ofs);
>  	} else {
>  		u16 rpbase = in_be16(spi_base);
>  
> diff --git a/drivers/spi/spi-fsl-lib.c b/drivers/spi/spi-fsl-lib.c
> index c3f7802..e9db4c5 100644
> --- a/drivers/spi/spi-fsl-lib.c
> +++ b/drivers/spi/spi-fsl-lib.c
> @@ -227,6 +227,8 @@ int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
>  		pdata->flags = SPI_CPM_MODE | SPI_CPM2;
>  	else if (of_device_is_compatible(np, "fsl,cpm1-spi"))
>  		pdata->flags = SPI_CPM_MODE | SPI_CPM1;
> +	else if (of_device_is_compatible(np, "fsl,cpm1-spi-reloc"))
> +		pdata->flags = SPI_CPM_MODE | SPI_CPM1 | SPI_CPM1_RELOC;

Where's the binding and device tree update for this?  What specific
aspect of hardware does it describe?

-Scott


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